Structures Of Life Pre-test Kettl
(60).webp "Structures Of Life Pre-test Kettl - Quiz")
pretest for third grade
Questions and Answers
- 1.
Which of the following seeds is different from the others?
- A.
Bean seeds
- B.
Peach seeds
- C.
Apple seeds
- D.
Orange seeds
Correct Answer
B. Peach seedsExplanation
The correct answer is peach seeds because beans, apples, and oranges are all fruits, while peaches are a type of fruit. Therefore, peach seeds are different from the others because they come from a different type of fruit.Rate this question:
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- 2.
Which structure of the plant holds the embryo (or sprout)?
- A.
Stem
- B.
Leaf
- C.
Seed
- D.
Root
Correct Answer
C. SeedExplanation
The seed is the correct answer because it is the structure of the plant that holds the embryo or sprout. The embryo is the young plant that is enclosed within the seed and has the potential to develop into a mature plant. The seed provides protection and nutrients for the developing embryo until it is ready to germinate and grow into a new plant.Rate this question:
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- 3.
What do you call the system in which plants grow in a water and nutrient solution?
- A.
Hydroponics
- B.
Germination
- C.
Hydrogen
- D.
Life cycle
Correct Answer
A. HydroponicsExplanation
Hydroponics is the correct answer because it refers to the system in which plants grow in a water and nutrient solution, without the use of soil. This method allows for controlled and efficient plant growth, as the plants receive all the necessary nutrients directly through the water.Rate this question:
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- 4.
What is most important in the process of germination?
- A.
Light
- B.
Food
- C.
Air
- D.
Water
Correct Answer
D. WaterExplanation
Water is the most important factor in the process of germination. Seeds require water to activate enzymes that break down stored food reserves and initiate metabolic processes. Water also helps in softening the seed coat, allowing the embryo to grow and emerge from the seed. Without water, germination cannot occur as the seed remains dormant and does not undergo the necessary biochemical changes to start the growth process.Rate this question:
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- 5.
Adam wants to set up a hydroponic container for bean seedlings. Which of these will he NOT need?
- A.
Water
- B.
Light
- C.
Nutrients
- D.
Soil
Correct Answer
D. SoilExplanation
Adam wants to set up a hydroponic container, which means he will be growing plants without using soil. In hydroponics, plants are grown in a nutrient-rich water solution, eliminating the need for soil. Therefore, Adam will not need soil for his hydroponic container.Rate this question:
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- 6.
Even though crayfish are completely covered in a hard shell, they can feel a touch mainly because of their
- A.
Bristles
- B.
Carapace
- C.
Swimmerets
- D.
Tail flaps
Correct Answer
A. BristlesExplanation
Crayfish can feel a touch mainly because of their bristles. Bristles, also known as setae, are small sensory hairs that cover the exoskeleton of crayfish. These bristles are connected to sensory cells, which can detect changes in the environment, including touch. Therefore, even though crayfish are covered in a hard shell, they can still sense and respond to touch stimuli through their bristles.Rate this question:
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- 7.
Color, shape and texture are all examples of
- A.
Seeds
- B.
Behaviors
- C.
Foods
- D.
Properties
Correct Answer
D. PropertiesExplanation
Color, shape, and texture are all examples of properties. Properties are characteristics or qualities that can be used to describe or identify something. In this case, color, shape, and texture are all properties that can be used to describe or identify an object or substance.Rate this question:
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- 8.
We add bleach to water that is used for seeds because
- A.
The bleach prevents mold from growing on the seeds
- B.
The bleach makes the seeds easier to see
- C.
The bleach makes everything smell clean
- D.
The bleach provides energy to the growing seeeds.
Correct Answer
A. The bleach prevents mold from growing on the seedsExplanation
Bleach is added to water that is used for seeds because it prevents mold from growing on the seeds. Mold can be harmful to the seeds and hinder their growth. By adding bleach, it acts as a disinfectant and helps to keep the seeds free from mold, ensuring their healthy growth.Rate this question:
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- 9.
When a crayfish grows, it crawls out of its shell. This is called
- A.
Molting
- B.
The life cycle
- C.
Carapace
- D.
Breaking
Correct Answer
A. MoltingExplanation
When a crayfish grows, it needs to shed its old shell and grow a new one. This process is called molting. During molting, the crayfish crawls out of its old shell and remains vulnerable until its new shell hardens. Molting is a natural part of the crayfish's growth and development.Rate this question:
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- 10.
Seeds are found in the part of the plant called the
- A.
Stem
- B.
Root
- C.
Fruit
- D.
Flower
Correct Answer
C. FruitExplanation
Seeds are typically found in the fruit of a plant. The fruit develops from the fertilized ovary of a flower and contains the seeds. The purpose of the fruit is to protect and disperse the seeds. Some examples of fruits that contain seeds are apples, oranges, and strawberries.Rate this question:
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- 11.
The beginning of development of a seed after a period of dormancy or rest is
- A.
Flowering
- B.
Molting
- C.
Hydroponics
- D.
Germination
Correct Answer
D. GerminationExplanation
Germination refers to the process of a seed beginning to develop and grow after a period of dormancy or rest. During germination, the seed absorbs water and swells, causing the outer shell to crack open. This allows the embryonic plant inside to emerge and start growing roots, stems, and leaves. Germination is a crucial stage in the life cycle of a plant, as it marks the beginning of its growth and development into a mature plant.Rate this question:
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- 12.
Something an animal does is called a
- A.
Habitat
- B.
Behavior
- C.
Territory
- D.
Life cycle
Correct Answer
B. BehaviorExplanation
The term "behavior" refers to the actions or activities performed by an animal. It includes all the ways in which an animal interacts with its environment, including its responses to stimuli, movement patterns, feeding habits, and social interactions. A habitat refers to the natural environment where an animal lives, a territory is a specific area that an animal defends, and a life cycle refers to the stages an organism goes through from birth to death. Therefore, "behavior" is the most appropriate term to describe the actions performed by an animal.Rate this question:
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- 13.
The outer covering of a seed is the
- A.
Seed coat
- B.
Embryo
- C.
Cotyledon
- D.
Dormant
Correct Answer
A. Seed coatExplanation
The outer covering of a seed is called the seed coat. It is a protective layer that surrounds and protects the embryo and other internal structures of the seed. The seed coat helps to prevent the seed from drying out and protects it from physical damage, pathogens, and other external factors. It also plays a role in regulating the germination process by controlling the exchange of gases and water with the environment.Rate this question:
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- 14.
Which of these is NOT a basic need for a bess beetle?
- A.
Food
- B.
Air
- C.
Space
- D.
Rocks
Correct Answer
D. RocksExplanation
Bess beetles require food, air, and space to survive, but rocks are not a basic need for them. Rocks do not provide any essential resources or fulfill any necessary functions for the beetles' survival. Therefore, rocks are not considered a basic need for a bess beetle.Rate this question:
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- 15.
Plants can grow in water without soil as long as they also have
- A.
Germination
- B.
Nutrients
- C.
Energy
- D.
Bleach
Correct Answer
B. NutrientsExplanation
Plants can grow in water without soil as long as they also have nutrients. Nutrients are essential for the growth and development of plants, providing them with the necessary elements for photosynthesis, metabolism, and overall health. In a water-based environment, plants can absorb nutrients directly from the water, allowing them to thrive without the need for soil.Rate this question:
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- 16.
Which of these is NOT a fruit?
- A.
Potato
- B.
Tomato
- C.
An orange
- D.
A cucumber
Correct Answer
A. PotatoExplanation
A potato is not a fruit because it is a starchy tuberous crop that belongs to the nightshade family. While tomatoes, oranges, and cucumbers are all fruits, the potato is classified as a vegetable due to its culinary uses and nutritional composition.Rate this question:
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- 17.
A class of mostly aquatic animals with hard, flexible shells, jointed legs, and two pairs of antennae is
- A.
Whale
- B.
Sea star
- C.
Crustacean
- D.
Arachnid
Correct Answer
C. CrustaceanExplanation
Crustaceans are a class of mostly aquatic animals that have hard, flexible shells, jointed legs, and two pairs of antennae. They include animals such as crabs, lobsters, and shrimp. Whales are mammals and do not have shells or jointed legs. Sea stars are echinoderms and do not have shells or antennae. Arachnids are a different class of animals that include spiders and scorpions, and they do not have shells or antennae either. Therefore, the correct answer is crustacean.Rate this question:
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- 18.
A seed that has one cotyledon is a
- A.
Dicot
- B.
Seed coat
- C.
Embryo
- D.
Monocot
Correct Answer
D. MonocotExplanation
A seed that has one cotyledon is called a monocot. Monocots are a type of flowering plant that have one seed leaf or cotyledon in their embryo. This is in contrast to dicots, which have two cotyledons. The number of cotyledons is one of the key characteristics used to classify plants into these two groups. Therefore, the correct answer is monocot.Rate this question:
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- 19.
The kind of organism that lives on or in a plant or animal of a different kind is a
- A.
Parasite
- B.
Exoskeleton
- C.
Fossil
- D.
Structure
Correct Answer
A. ParasiteExplanation
A parasite is an organism that lives on or in a plant or animal of a different kind, deriving nutrients and often causing harm to its host in the process. It relies on the host for survival and reproduction, often at the expense of the host's well-being. Parasites have evolved various mechanisms to attach to or invade their hosts, and they can be found in a wide range of organisms, including plants, animals, and even humans.Rate this question:
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- 20.
An animal that hunts and catches other animals for food is a
- A.
Herbivore
- B.
Predator
- C.
Omnivore
- D.
Rabbit
Correct Answer
B. PredatorExplanation
A predator is an animal that hunts and catches other animals for food. It is not a herbivore, which only eats plants, or an omnivore, which eats both plants and animals. A rabbit is a specific type of animal and does not necessarily hunt and catch other animals for food. Therefore, the correct answer is predator.Rate this question:
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