Structures Of Life Pre-test
(12).webp "Structures Of Life Pre-test - 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 all the other options are seeds of fruits, while peach seeds are seeds of a specific 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. Seeds contain the plant embryo, which is the early stage of growth for a new plant. Inside the seed, the embryo is protected and nourished by the seed coat and stored nutrients. When conditions are favorable, the embryo will 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. In hydroponics, plants receive all the necessary nutrients directly from the water, allowing for efficient and controlled growth. This method is often used in agriculture and gardening to optimize plant growth and conserve water resources.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 contain stored food that provides energy for growth, and light is necessary for photosynthesis once the seedling emerges. However, without water, the seed cannot activate the enzymes needed for germination to occur. Water is essential for softening the seed coat, initiating metabolic processes, and allowing the embryo to expand and grow. It also helps in the breakdown of stored food, making it available for the developing seedling. Therefore, water is crucial for the successful germination of a seed.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 for bean seedlings, which means he will be growing plants without the use of 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 are sensory structures located on the exoskeleton of crayfish. These bristles are equipped with sensors that can detect changes in pressure and movement, allowing crayfish to sense touch and navigate their environment. The hard shell of crayfish does not impede their ability to feel touch because the bristles are protruding from the shell, enabling them to interact with their surroundings.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 objects or substances.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
Adding bleach to water that is used for seeds helps prevent mold from growing on the seeds. Mold can be harmful to the seeds and hinder their growth. Bleach has antimicrobial properties that can kill or inhibit the growth of mold and other microorganisms, ensuring a healthier environment for the seeds to germinate and grow.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, which has become too small for its growing body. Once it is out of the old shell, the crayfish secretes a new, soft shell that will harden over time. Molting is an essential part of the crayfish's life cycle as it allows for 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 found in the fruit of a plant. The fruit is the mature ovary of a flowering plant that contains the seeds. The purpose of the fruit is to protect and disperse the seeds, allowing for the propagation and survival of the plant species.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 by which a seed begins to grow and develop after a period of dormancy or rest. During germination, the seed absorbs water and swells, causing the outer covering to split open. This allows the embryo inside the seed to emerge and start developing into a new plant. Germination is a crucial stage in the life cycle of a plant as it marks the beginning of its growth and establishment.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
Behavior refers to the actions or reactions of an animal in response to its environment or stimuli. It includes all the activities that an animal engages in, such as feeding, mating, and communicating. A habitat refers to the natural environment where an animal lives, a territory is a specific area that an animal defends and marks as its own, and a life cycle refers to the stages of growth and development that an animal goes through from birth to death. Therefore, behavior is the most appropriate term to describe something an animal does.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 the embryo and the cotyledon. The seed coat acts as a barrier, preventing damage to the embryo from external factors such as drought, pests, and diseases. It also helps in the dispersal of seeds by providing resistance to mechanical forces during transportation. Additionally, the seed coat plays a role in regulating the germination process by controlling the entry of water and gases into the seed.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 for their basic needs. However, rocks are not a basic need for them. Rocks do not provide any essential requirement for their survival or well-being. Bess beetles primarily feed on decaying wood, so rocks are not necessary for their diet. Therefore, rocks can be considered as something that is not 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 plant growth and development, providing the necessary elements for various biological processes. In the absence of soil, plants can obtain nutrients from water through a process called hydroponics. This method involves providing a nutrient-rich solution directly to the roots of the plants, allowing them to absorb the necessary minerals for their growth. Therefore, having nutrients is crucial for plants to survive and thrive in a soil-less environment.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
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, potatoes are classified as a vegetable due to their different botanical characteristics.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. This group includes animals like crabs, lobsters, and shrimp. Whales are mammals, sea stars are echinoderms, and arachnids are a different class of animals that include spiders and scorpions. 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 classified as a monocot. Monocots are a type of flowering plant that typically have one cotyledon, or seed leaf, in their seeds. 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 categories. The seed coat and embryo are components of a seed but do not determine whether it is a monocot or dicot.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, obtaining nutrients and shelter from its host while often causing harm or damage to it. Parasites rely on their hosts for survival and reproduction, and they can be found in various forms such as fleas, ticks, lice, and certain types of bacteria and viruses. They have evolved various strategies to adapt to their hosts and ensure their own survival, often leading to a complex and intricate relationship between the parasite and its host.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. This means that it actively seeks out and preys upon other animals as a means of survival. Predators have adaptations such as sharp teeth, claws, and keen senses to help them in their hunting endeavors. They play a crucial role in maintaining the balance of ecosystems by controlling the population of prey species.Rate this question:
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