7th Grade Life Science
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Bacteria can be seen best at what power on our microscopes?
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100X
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400X
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50X
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They can't be seen with our microscopes.
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About This Quiz
Life science helps us study all living organisms in our world. Being that living organisms have a lot to be studies for example their habitats, adaptations and threats to life the course can be a little wide. The quiz below covers all the topics of life science for 7th grade. Give it a try.
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Quiz Preview
- 2.
The "brain" of a cell is the __________.
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Nucleus
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Cell membrane
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Cell wall
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Ribosome
Correct Answer
A. NucleusExplanation
The nucleus is considered the "brain" of a cell because it contains the cell's genetic material, including DNA, which directs the cell's activities and controls its functions. The nucleus also regulates the synthesis of proteins through the production of RNA, which is then transported to the ribosomes for protein synthesis. Additionally, the nucleus plays a role in cell division and replication, making it a crucial component in the overall functioning of a cell.Rate this question:
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- 3.
Plant cells have 2 things that animal cells don't have. What are they?
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Nuclei and chromosmes
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Cell membrane and cytoplasm
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Cell wall and chloroplasts
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Plant and animal cells have the same structures
Correct Answer
A. Cell wall and chloroplastsExplanation
The correct answer is cell wall and chloroplasts. Plant cells have a rigid cell wall made of cellulose, which provides structural support and protection. Animal cells do not have a cell wall. Additionally, plant cells contain chloroplasts, which are responsible for photosynthesis and contain chlorophyll. Animal cells do not have chloroplasts. This distinction in cell wall and chloroplasts is what sets plant cells apart from animal cells.Rate this question:
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- 4.
On a microscope, the diaphragm controls _____________.
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The size of the specimen
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The focusing
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How close the lens is to the slide
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The amount of light
Correct Answer
A. The amount of lightExplanation
The diaphragm on a microscope controls the amount of light that passes through the specimen. By adjusting the diaphragm, the user can increase or decrease the amount of light reaching the specimen, which can help in achieving optimal visibility and clarity during observation.Rate this question:
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- 5.
The microscope part that holds the lenses and rotates is called the ________.
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Coarse adjustment knob
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Nosepiece
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Eyepiece
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Stage
Correct Answer
A. NosepieceExplanation
The nosepiece is the correct answer because it is the part of the microscope that holds the lenses and rotates. It allows the user to switch between different objective lenses, which are essential for adjusting the magnification of the microscope. The nosepiece is typically located near the bottom of the microscope's body tube and is easily accessible for rotating and changing lenses.Rate this question:
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- 6.
Green plants take in _____ and produce ______.
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Co2, O2
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O2, Co2
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H2O, CO
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C6H12O6, H2O
Correct Answer
A. Co2, O2Explanation
Green plants take in carbon dioxide (CO2) during photosynthesis and produce oxygen (O2) as a byproduct. This process is essential for the survival of many organisms on Earth as it helps to maintain the balance of gases in the atmosphere.Rate this question:
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- 7.
3 bones that support the body are ______.
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The cranium, tarsals, and patella
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The scapula, sternum, and tibia
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The carpals, radius, and humerus
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The femur, vertebra, and ribs
Correct Answer
A. The femur, vertebra, and ribsExplanation
The femur, vertebra, and ribs are the correct answer because these bones play a crucial role in supporting the body. The femur, the longest and strongest bone in the body, supports the weight of the upper body and allows for movement. The vertebrae form the spinal column, providing support and protection for the spinal cord while allowing for flexibility. The ribs protect the vital organs in the chest and also contribute to the stability of the upper body.Rate this question:
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- 8.
The mandible can be found _______.
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In the chest
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In the lower leg
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In the jaw
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In the upper arm
Correct Answer
A. In the jawExplanation
The mandible is a bone that is commonly known as the jawbone. It is the largest and strongest bone in the human face and forms the lower jaw. It is connected to the skull by the temporomandibular joint, allowing for movements such as chewing and speaking. Therefore, the correct answer is "in the jaw."Rate this question:
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- 9.
The function of cartilage is to ______.
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Protect the ends of bones
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Make bones move more easily
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Both
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Neither
Correct Answer
A. BothExplanation
Cartilage serves the function of both protecting the ends of bones and making bones move more easily. It acts as a cushion between bones, preventing them from rubbing against each other and causing damage. Additionally, cartilage reduces friction and allows for smooth movement at joints, enabling bones to glide and articulate with ease. Therefore, the correct answer is both.Rate this question:
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- 10.
How are chicken wings different than human arms?
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Chickens have more phalanges.
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Human joints bend more easily.
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Chickens have more wrist bones.
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Chickens have fused phalanges.
Correct Answer
A. Chickens have fused phalanges.Explanation
Chickens have fused phalanges means that the bones in their wings are joined together, unlike human arms where the phalanges are separate. This structural difference allows chickens to have a more rigid wing structure, which is necessary for flight.Rate this question:
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- 11.
The muscles that work as a pair to move the arm are the ______.
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Gastrocnemius and pectorals
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Bicep and tricep
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Masseter and trapezius
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Hamstring and quadriceps
Correct Answer
A. Bicep and tricepExplanation
The bicep and tricep muscles are located in the upper arm and work together as a pair to move the arm. The bicep muscle is responsible for flexing the arm at the elbow joint, while the tricep muscle is responsible for extending the arm. These muscles have an antagonistic relationship, meaning that when one contracts, the other relaxes. This allows for smooth and coordinated movement of the arm.Rate this question:
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- 12.
Which of these is NOT an example of a smooth muscle?
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Deltoid
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Diaphragm
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Iris
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Intestine
Correct Answer
A. DeltoidExplanation
The deltoid muscle is not an example of a smooth muscle because it is a skeletal muscle. Smooth muscles are found in the walls of organs and blood vessels, and they are involuntary muscles. The diaphragm, iris, and intestine are all examples of smooth muscles because they are found in organs and have involuntary control.Rate this question:
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- 13.
Which organism causes athlete's foot?
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Virus
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Bacteria
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Fungus
Correct Answer
A. FungusExplanation
Athlete's foot is a common fungal infection that affects the skin on the feet. It is caused by a group of fungi called dermatophytes. These fungi thrive in warm and moist environments, such as locker rooms and swimming pool areas. They can be easily transmitted through direct contact with infected surfaces or by sharing personal items like towels or shoes. The fungi feed on the dead skin cells and multiply, leading to symptoms like itching, redness, and cracking of the skin. Therefore, the correct answer is fungus.Rate this question:
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- 14.
On agar, bacteria look ________.
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Fuzzy or furry
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Flat and colorful
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Like tiny mushrooms
Correct Answer
A. Flat and colorfulExplanation
On agar, bacteria appear flat and colorful. Agar is a gelatinous substance used as a growth medium in laboratories to culture bacteria. When bacteria grow on agar, they form colonies that are typically flat and can exhibit a range of colors depending on the type of bacteria and the nutrients present in the agar. This characteristic appearance helps in identifying and distinguishing different bacterial species.Rate this question:
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- 15.
The layer of skin that bleeds when you cut it is the _______.
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Epidermis
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Dermis
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Fat layer
Correct Answer
A. DermisExplanation
The dermis is the layer of skin that contains blood vessels, which is why it bleeds when you cut it. The epidermis is the outermost layer of the skin, and the fat layer is located beneath the dermis. However, neither of these layers contain blood vessels, so they would not bleed when cut.Rate this question:
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- 16.
The most damaging sun rays are ____________.
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Visible light
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Infrared
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UV
Correct Answer
A. UVExplanation
UV rays are the most damaging sun rays because they have a higher energy level than visible light or infrared rays. UV rays can penetrate the skin and cause damage to the DNA in skin cells, leading to sunburn, premature aging, and an increased risk of skin cancer. It is important to protect the skin from UV rays by using sunscreen, wearing protective clothing, and seeking shade during peak sun hours.Rate this question:
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- 17.
Food stays in the stomach for about _________.
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12 hours
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15 minutes
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2 days
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6 hours
Correct Answer
A. 6 hoursExplanation
Food stays in the stomach for about 6 hours. After we eat, the food enters the stomach where it is broken down by stomach acids and enzymes. This process takes approximately 2-4 hours. Once the food is broken down into a liquid-like substance called chyme, it gradually moves into the small intestine for further digestion and absorption of nutrients. Therefore, the correct answer is 6 hours.Rate this question:
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- 18.
The most important stage of digestion (absorption of nutrients) takes place in the _____.
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Large intestine
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Small intestine
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Stomach
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Colon
Correct Answer
A. Small intestineExplanation
The small intestine is the correct answer because it is the primary site where the absorption of nutrients from digested food occurs. It is lined with specialized cells called villi, which increase its surface area for efficient absorption. The small intestine receives partially digested food from the stomach and further breaks it down using digestive enzymes. Nutrients such as carbohydrates, proteins, fats, vitamins, and minerals are absorbed into the bloodstream through the walls of the small intestine and then transported to the body's cells for energy and other functions.Rate this question:
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- 19.
Constipation results when ______________.
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Food moves too rapidly through the intestines
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Food moves too slowly through the intestines
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Bacteria are present
Correct Answer
A. Food moves too slowly through the intestinesExplanation
Constipation occurs when food moves too slowly through the intestines. This can happen due to various reasons such as lack of fiber in the diet, inadequate fluid intake, lack of physical activity, certain medications, or medical conditions like irritable bowel syndrome or hypothyroidism. When food moves slowly through the intestines, more water is absorbed from it, resulting in dry and hard stools that are difficult to pass. Increasing fiber intake, staying hydrated, exercising regularly, and addressing any underlying medical conditions can help alleviate constipation.Rate this question:
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- 20.
Normal human heart rate is about _______ beats per minute.
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120
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100
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60
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20
Correct Answer
A. 60Explanation
The normal human heart rate is about 60 beats per minute. This is considered the average resting heart rate for adults. During physical activity or stress, the heart rate may increase, but at rest, a rate of 60 beats per minute is considered normal.Rate this question:
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- 21.
The large artery that carries blood to the brain and body is called the ______.
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Aorta
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Ventricle
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Capillary
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Vena cava
Correct Answer
A. AortaExplanation
The large artery that carries blood to the brain and body is called the aorta. The aorta is the main artery that originates from the left ventricle of the heart and distributes oxygenated blood to all parts of the body through its branches. It is responsible for supplying vital oxygen and nutrients to the brain and other organs, making it a crucial component of the circulatory system.Rate this question:
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- 22.
The most muscular part of the heart is the ____________.
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Septum
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Right side
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Left side
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Bottom
Correct Answer
A. Left sideExplanation
The left side of the heart is the correct answer because it is responsible for pumping oxygenated blood to the rest of the body. The left ventricle, which is part of the left side of the heart, is the most muscular chamber in the heart. It has thicker walls compared to the right ventricle because it needs to generate enough force to pump blood throughout the body's systemic circulation.Rate this question:
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- 23.
The small vessels that connect arteries and veins are called _________.
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Arterioles
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Valves
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Vessels
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Capillaries
Correct Answer
A. CapillariesExplanation
Capillaries are the small vessels that connect arteries and veins. They are responsible for the exchange of oxygen, nutrients, and waste products between the blood and the surrounding tissues. Capillaries have thin walls and a large surface area, which allows for efficient diffusion of substances. Arterioles are small branches of arteries, valves are structures that prevent backflow of blood, and vessels is a general term that includes arteries, veins, and capillaries. Therefore, the correct answer is capillaries.Rate this question:
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- 24.
Veins carry blood that is ___________.
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Low in oxygen
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High in oxygen
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Going to the brain
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Going to the organs
Correct Answer
A. Low in oxygenExplanation
Veins carry blood that is low in oxygen. Unlike arteries, which carry oxygen-rich blood away from the heart to the rest of the body, veins transport oxygen-depleted blood back to the heart. This blood has delivered oxygen to the body's tissues and organs and is now returning to the heart and lungs to be replenished with fresh oxygen.Rate this question:
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- 25.
Which blood cells carry oxygen?
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Red blood cells
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White blood cells
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Platelets
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Fibrin cells
Correct Answer
A. Red blood cellsExplanation
Red blood cells carry oxygen in the body. They contain a protein called hemoglobin, which binds to oxygen in the lungs and transports it to the body's tissues. This process is essential for delivering oxygen to all cells and organs, ensuring their proper functioning. White blood cells, platelets, and fibrin cells have different functions in the body, such as fighting infections, clotting blood, and repairing damaged tissues, but they do not carry oxygen like red blood cells do.Rate this question:
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- 26.
The windpipe is also known as the ___________.
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Esophagus
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Sphincter
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Trachea
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Epiglottis
Correct Answer
A. TracheaExplanation
The windpipe, also known as the trachea, is responsible for carrying air from the nose and mouth to the lungs. It is a tube-like structure that is located in the neck and chest area. The trachea is made up of rings of cartilage to keep it open and prevent collapse. It is an important part of the respiratory system and plays a crucial role in breathing. The esophagus, on the other hand, is responsible for carrying food from the mouth to the stomach, while the sphincter is a circular muscle that controls the flow of substances in the body. The epiglottis is a flap of tissue that prevents food from entering the windpipe during swallowing.Rate this question:
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- 27.
Most of air is made up of ___________.
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Oxygen
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Carbon monxide
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Carbon dioxide
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Nitrogen
Correct Answer
A. NitrogenExplanation
The majority of the Earth's atmosphere is composed of nitrogen. It makes up about 78% of the air we breathe. Oxygen, carbon monoxide, carbon dioxide, and other gases make up the remaining percentage. Nitrogen is essential for life as it is a key component of proteins and nucleic acids. It is also used in various industrial processes and plays a crucial role in maintaining the Earth's climate and weather patterns.Rate this question:
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- 28.
The addictive chemical in cigarettes is _____________.
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Tar
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Carbon dioxide
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Nicotine
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The addictive chemicals have been removed
Correct Answer
A. NicotineExplanation
Nicotine is the addictive chemical in cigarettes. It is a highly addictive substance that stimulates the release of dopamine in the brain, creating a pleasurable sensation and reinforcing the desire to continue smoking. Nicotine addiction can lead to physical and psychological dependence, making it difficult for individuals to quit smoking. Tar and carbon dioxide are harmful components of cigarette smoke, but they are not the addictive chemicals.Rate this question:
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- 29.
Since we have been keeping track, air quality has normally been between _______.
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20-30
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30-40
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10-20
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Over 50
Correct Answer
A. 30-40Explanation
Based on the given information, it can be inferred that the air quality has been consistently within the range of 30-40.Rate this question:
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- 30.
The brain part that controls the 5 senses is the _____.
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Cerebrum
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Cerebellum
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Medulla
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Spinal cord
Correct Answer
A. CerebrumExplanation
The cerebrum is the part of the brain that controls the five senses. It is the largest part of the brain and is responsible for processing sensory information, such as sight, hearing, taste, smell, and touch. It plays a crucial role in interpreting and making sense of the world around us. The cerebrum is divided into two hemispheres and is responsible for higher cognitive functions, including memory, language, and problem-solving.Rate this question:
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- 31.
If you have 20/40 vision, _____________
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You can see at 40 feet what most people can see at 20
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You can see at 20 feet what most people can see at 40
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You are legally blind
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You are far sighted
Correct Answer
A. You can see at 20 feet what most people can see at 40Explanation
If you have 20/40 vision, it means that you can see at 20 feet what most people with normal vision can see at 40 feet. This indicates that your visual acuity is below average, as you need to be closer to an object to see it clearly compared to someone with 20/20 vision.Rate this question:
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- 32.
The eye part that allows animals to see in low light is called the ______.
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Retina
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Iris
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Tapetum
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Sclera
Correct Answer
A. TapetumExplanation
The tapetum is the eye part that allows animals to see in low light. It is a reflective layer located behind the retina in the back of the eye. This layer helps to enhance night vision by reflecting light back through the retina, giving it a second chance to be detected by the photoreceptor cells. This is why animals with a tapetum, such as cats and dogs, have better night vision than humans. The retina, iris, and sclera are other parts of the eye, but they do not specifically contribute to low light vision.Rate this question:
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- 33.
The ear part that controls balance, not hearing is the ______.
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Cochlea
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Semicircular canal
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Eustachian tube
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Eardrum
Correct Answer
A. Semicircular canalExplanation
The semicircular canals are the part of the ear that controls balance, not hearing. These canals are filled with fluid and contain sensory hair cells that detect changes in head position and movement. When the head moves, the fluid in the canals also moves, causing the hair cells to send signals to the brain, which helps maintain balance and coordination. The cochlea is responsible for hearing, the eustachian tube helps equalize pressure in the middle ear, and the eardrum helps transmit sound vibrations.Rate this question:
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- 34.
A screaming child produces about ______ decibels of sound.
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50
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80
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110
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140
Correct Answer
A. 80Explanation
A screaming child produces about 80 decibels of sound. Decibels are a unit used to measure the intensity of sound. 80 decibels is considered quite loud, similar to the sound of a busy street or a vacuum cleaner. This level of noise can be disruptive and may cause discomfort to those nearby.Rate this question:
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- 35.
The hormone that controls changes in boys at puberty is called ______.
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Estrogen
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Testosterone
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Amygdala
Correct Answer
A. TestosteroneExplanation
Testosterone is the hormone that controls changes in boys at puberty. During puberty, the production of testosterone increases, leading to the development of secondary sexual characteristics such as deepening of the voice, growth of facial and body hair, enlargement of the testes, and muscle development. Estrogen is the primary female sex hormone, and while it also plays a role in male development, testosterone is the main hormone responsible for the changes that occur during puberty in boys. The amygdala is a part of the brain involved in emotion and memory processing, but it is not a hormone.Rate this question:
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- 36.
The muscle that holds the baby in the uterus is the ______.
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Vagina
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Fallopian tube
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Ovary
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Cervix
Correct Answer
A. CervixExplanation
The cervix is the correct answer because it is the muscle that holds the baby in the uterus during pregnancy. It acts as a barrier between the uterus and the vagina, preventing the baby from descending prematurely. The cervix also undergoes changes during labor, dilating and thinning to allow the baby to pass through during childbirth.Rate this question:
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- 37.
Erections always come before ejaculations.
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Always true
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Sometimes true
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Never true
Correct Answer
A. Always trueExplanation
This statement is always true because an erection is the result of increased blood flow to the penis, causing it to become firm and erect. Ejaculation, on the other hand, is the release of semen from the penis. In the normal sequence of events during sexual arousal, an erection occurs first, followed by ejaculation. Therefore, it can be said that erections always come before ejaculations.Rate this question:
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- 38.
Two STDs that cannot be cured are _________.
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Chlamydia and gonorrhea
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AIDS and HPV (warts)
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None of these can be cured
Correct Answer
A. AIDS and HPV (warts)Explanation
AIDS and HPV (warts) are two STDs that cannot be cured. AIDS is caused by the Human Immunodeficiency Virus (HIV) and attacks the immune system, making it difficult for the body to fight off infections and diseases. While there are antiretroviral drugs that can help manage HIV, there is currently no cure. HPV is a viral infection that can cause genital warts and certain types of cancer. While the warts can be treated and removed, there is no cure for the underlying HPV infection.Rate this question:
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- 39.
A picture of chromosomes that is cut apart and arranged in order of size is a _______.
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Chromosome map
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DNA diagram
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Karyotype
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None of these
Correct Answer
A. KaryotypeExplanation
A karyotype is a picture of chromosomes that have been cut apart and arranged in order of size. It is used to study the number, size, and shape of chromosomes in an individual's cells. By examining a karyotype, genetic abnormalities or disorders can be identified. Therefore, a karyotype is the correct term to describe a picture of chromosomes that is cut apart and arranged in order of size.Rate this question:
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- 40.
Which statement is true?
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Girls have more genes than boys.
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Boys have more genes than girls.
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Girls and boys have the same number of genes-23.
Correct Answer
A. Girls have more genes than boys. -
- 41.
When studying PTC tasting ability, which genotype does NOT allow tasting?
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TT
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Tt
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Tt
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Both A and B
Correct Answer
A. TtExplanation
The genotype "tt" does not allow tasting in PTC tasting ability. This is because the "t" allele is a non-functional allele that results in the inability to taste the chemical PTC. The other genotypes, "TT" and "Tt", have at least one functional allele and therefore allow tasting.Rate this question:
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- 42.
Identical twins form when __________________.
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Two eggs are fertilized by sperm
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One egg is fertilized and splits
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An egg doesn't divide completely
Correct Answer
A. One egg is fertilized and splitsExplanation
Identical twins form when one egg is fertilized and splits. This occurs when a single fertilized egg, also known as a zygote, divides into two separate embryos. As a result, both embryos have the same genetic information and develop into identical twins. This is different from fraternal twins, which form when two separate eggs are fertilized by two different sperm.Rate this question:
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- 43.
Which blood type recessive?
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A
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B
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AB
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O
Correct Answer
A. OExplanation
Blood type O is considered recessive because it does not have any antigens on the surface of red blood cells. This means that it can be donated to individuals with any blood type, making it the universal donor. In contrast, blood types A, B, and AB all have antigens on their red blood cells, making them dominant over type O.Rate this question:
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- 44.
Most Americans have blood type _______.
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A
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B
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AB
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O
Correct Answer
A. OExplanation
The most common blood type among Americans is O. This is because blood type O is the most widely distributed blood type in the general population. Approximately 45% of Americans have blood type O, making it the most prevalent blood type in the country.Rate this question:
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- 45.
A producer is an organism that ____________.
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Eats dead animals and plants
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Eats only meat
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Makes its own food
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Has a cell membrane but no cell wall
Correct Answer
A. Makes its own foodExplanation
A producer is an organism that makes its own food through a process called photosynthesis. This process involves using sunlight, carbon dioxide, and water to produce glucose and oxygen. Producers, such as plants and some types of bacteria, are able to convert these raw materials into energy-rich molecules that they can use for growth and survival. This ability to produce their own food sets producers apart from other organisms that rely on consuming other organisms for energy.Rate this question:
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- 46.
Which of these is an herbivore?
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Giraffe
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Tasmanian devil
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Spider
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Robin
Correct Answer
A. GiraffeExplanation
A giraffe is an herbivore because it primarily feeds on leaves, shoots, and fruits from trees. Its long neck and tongue allow it to reach high branches, where it can find its main source of food. Unlike the other options, the giraffe does not eat meat or insects, making it the only herbivorous animal listed.Rate this question:
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- 47.
Which of these food chains is correct?
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Sunflower- mouse - hawk
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Hawk - mouse- sunflower
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Grasshopper - sunflower - mouse
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Mouse - grasshopper - sunflower
Correct Answer
A. Sunflower- mouse - hawkExplanation
The correct food chain is sunflower - mouse - hawk. In a food chain, energy flows from one organism to another through the consumption of food. In this case, the sunflower is a producer that converts sunlight into energy through photosynthesis. The mouse then consumes the sunflower for energy, and finally, the hawk preys on the mouse for its energy needs. This sequence follows the natural flow of energy in an ecosystem.Rate this question:
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- 48.
Which animals are at the top of food chains?
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Carnivores
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Herbivores
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Prey
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Omnivores
Correct Answer
A. OmnivoresExplanation
Omnivores are at the top of food chains because they have a diverse diet, consuming both plants and animals. This allows them to obtain energy from multiple sources and gives them an advantage in terms of survival and adaptation. Omnivores have the ability to feed on both herbivores and carnivores, making them higher up in the food chain compared to other animals.Rate this question:
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- 49.
What will happen in a Colorado ecosystem if all the coyotes are destroyed. Answer in at least 2 sentences.
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