Plants and Ecosystems
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Parts of a Plant and Photosynthesis
SubtopicParts of a Plant and Photosynthesis under Plants and Ecosystems for Grade 3 IB.
Preview questions (no answers)
- 1.
When you eat a piece of celery, which part of the plant are you mostly eating?
A.The root
B.The flower
C.The stem
D.The seed
- 2.
What do plants provide for animals and humans in an ecosystem?
A.Only shade
B.Food and oxygen
C.Rocks and soil
D.Water and fire
- 3.
What happens to the leaves of many trees in the autumn season?
A.They turn blue
B.They stop doing photosynthesis and fall off
C.They grow much larger
D.They turn into flowers
- 4.
Which part of the flower is often very colorful to attract insects like butterflies?
A.The stem
B.The roots
C.The petals
D.The seeds
- 5.
A plant uses the food it makes during photosynthesis for many things. Which of these is a way the plant uses that food?
A.To produce more carbon dioxide for humans
B.To build new leaves, stems, and roots for growth
C.To make the sunlight shine brighter
D.To turn the soil into water
- 6.
Why do some plants in very dry ecosystems have roots that spread out very wide near the surface?
A.To catch as much rainwater as possible before it evaporates
B.To help the plant 'walk' to a wetter area
C.To find more sunlight underground
D.To keep the plant from getting too hot from the sand
- 7.
If we look at a leaf under a microscope, we see that the green color is not everywhere but is inside tiny 'packets'. What is the job of these green packets?
A.To store water for a dry day
B.To act as tiny solar panels that capture energy from the sun
C.To protect the leaf from being eaten by bugs
D.To hold the seeds until they are ready to fall
- 8.
Why do some seeds, like those from a dandelion, have fluffy 'parachutes'?
A.To help the seed float in the ocean
B.To attract birds to carry them away
C.To allow the wind to carry the seed far away from the parent plant
D.To keep the seed warm during the winter
- 9.
Which of these is a 'waste product' of photosynthesis that is actually essential for the survival of most animals?
A.Carbon Dioxide
B.Sugar
C.Oxygen
D.Water
- 10.
A plant is kept in a dark room. After a week, its leaves look pale. The plant is then moved to a sunny window. What will happen to the chlorophyll levels in the new leaves?
A.They will decrease because the sun is too bright.
B.They will increase as the plant begins to photosynthesize again.
C.They will stay the same because chlorophyll is permanent.
D.The plant will stop making chlorophyll to save energy.
Download the worksheet for Plants and Ecosystems - Parts of a Plant and Photosynthesis to practice offline. It includes additional chapter-level practice questions.
Life Cycles of Living Things
SubtopicLife Cycles of Living Things under Plants and Ecosystems for Grade 3 IB.
Preview questions (no answers)
- 1.
Some seeds are covered in tiny hooks or burrs. How does this help the plant complete its life cycle?
A.The hooks stick to animal fur so the seeds can travel to new places
B.The hooks help the seed swim in the ocean
C.The hooks protect the seed from being eaten
D.The hooks help the seed absorb more sunlight
- 2.
Which of these is a stage in the life cycle of a ladybug where it stays very still inside a hard covering while its body changes?
A.Egg
B.Pupa
C.Larva
D.Adult
- 3.
In the life cycle of some insects, what do we call the young stage that often looks like a smaller version of the adult but without wings?
A.Seed
B.Pupa
C.Caterpillar
D.Nymph
- 4.
What is the name of the green substance in leaves that helps plants capture energy to grow?
A.Water
B.Sugar
C.Chlorophyll
D.Soil
- 5.
Which part of the plant life cycle is primarily responsible for taking in light to produce energy?
A.The roots
B.The leaves
C.The petals
D.The seeds
- 6.
How do animals like squirrels contribute to the life cycle of an oak tree?
A.By eating all the leaves so the tree grows faster
B.By burying acorns (seeds) and forgetting where they are
C.By drinking the sap from the trunk
D.By building nests that keep the tree warm
- 7.
In the life cycle of a flowering plant, what must happen immediately BEFORE a fruit can form?
A.The seeds must germinate
B.The flower must be pollinated and fertilized
C.The leaves must fall off
D.The roots must grow deeper
- 8.
How might global warming (rising temperatures) disrupt the synchronized life cycles of a bird and the caterpillars it eats?
A.The caterpillars might hatch earlier due to heat, meaning they are gone by the time the birds hatch their eggs.
B.The birds will start eating the heat instead of the caterpillars.
C.The caterpillars will turn into birds to escape the heat.
D.The birds will stop laying eggs and start growing leaves.
- 9.
Some seeds have 'hooks' or 'burrs' that stick to animal fur. If an animal moves a seed 5 miles away, how does this specifically help the plant's life cycle?
A.It allows the seed to grow in a place with less competition from its parent plant.
B.It makes the seed grow into an animal-plant hybrid.
C.It protects the seed from ever touching the dirt.
D.It ensures the seed stays warm during the winter.
- 10.
In a balanced ecosystem, how does the life cycle of a predator (like a wolf) help the life cycle of the plants?
A.The wolf eats the plants to help them grow back stronger.
B.The wolf controls the population of herbivores, preventing them from overeating all the plants.
C.The wolf breathes out oxygen for the plants to use.
D.The wolf's fur provides shade for small flowers.
Download the worksheet for Plants and Ecosystems - Life Cycles of Living Things to practice offline. It includes additional chapter-level practice questions.
Animal Adaptations
SubtopicAnimal Adaptations under Plants and Ecosystems for Grade 3 IB.
Preview questions (no answers)
- 1.
Sharks have strong fins on their bodies. Based on the diagram, how do these fins help the shark survive in its ocean habitat?
A.They help the shark breathe oxygen from the water.
B.They help the shark stay warm in cold water.
C.They help the shark balance and move through the water.
D.They help the shark hide from other fish in the sand.
- 2.
What part of a seed provides food for the tiny baby plant inside until it can grow leaves?
A.The seed coat
B.The stored food area
C.The roots
D.The flower
- 3.
What is the role of a 'consumer' in an ecosystem?
A.To make its own food using the sun
B.To eat plants or other animals for energy
C.To break down rocks into soil
D.To provide water for the plants
- 4.
Why do penguins huddle together in large groups?
A.To play games together
B.To share body heat and stay warm
C.To hide from polar bears
D.To find food more easily
- 5.
Bees visit flowers to collect nectar, and while doing so, they get pollen on their bodies which they carry to the next flower. This is an example of:
A.Competition for resources
B.A predator-prey relationship
C.Interdependence between plants and animals
D.A plant protecting itself from an insect
- 6.
If a plant's roots were unable to grow deep into the soil, which of the following would be the most likely problem for the plant?
A.It would not be able to produce seeds
B.It would not be able to absorb enough sunlight
C.It would be easily blown over by the wind or run out of water
D.It would produce flowers that are the wrong color
- 7.
Certain types of fish swim in a large, coordinated group called a 'school.' Why is this a successful survival strategy?
A.It makes it easier for the fish to find a place to sleep
B.It confuses predators and reduces the chance of a single fish being caught
C.It helps the fish swim against the current more easily
D.It allows the fish to share their food with each other
- 8.
Some seeds, like those of the Lodgepole Pine, are sealed in cones with a thick resin that only melts during a forest fire. Why is this an effective adaptation?
A.The fire kills the seeds' predators so they can grow safely
B.The seeds germinate after the fire when there is less competition for light
C.The ash from the fire is the only food the seeds can eat
D.The seeds need the high temperature to change their color
- 9.
Many birds that live near the ocean have special glands near their eyes that 'sneeze' out extra salt. Why is this a necessary adaptation?
A.To help them see more clearly through the salt spray
B.To allow them to drink seawater without getting sick
C.To keep their feathers from becoming too heavy with salt
D.To mark their territory on the beach
- 10.
Some types of mushrooms are brightly colored (red or orange) and have a very bad smell. How does this adaptation most likely help the mushroom?
A.It helps the mushroom absorb more heat from the sun
B.It warns animals that the mushroom might be poisonous
C.It attracts bees to carry its seeds to other places
D.It helps the mushroom blend in with falling leaves
Download the worksheet for Plants and Ecosystems - Animal Adaptations to practice offline. It includes additional chapter-level practice questions.
Habitats and Food Chains
SubtopicHabitats and Food Chains under Plants and Ecosystems for Grade 3 IB.
Preview questions (no answers)
- 1.
Besides taking in water, what is another job of a plant's roots?
A.Making seeds
B.Holding the plant firmly in the ground
C.Catching sunlight
D.Producing flowers
- 2.
What do we call it when many food chains in a habitat are connected together?
A.A food link
B.A food web
C.A plant cycle
D.A habitat group
- 3.
Why might some animals sleep all winter in their habitat (hibernate)?
A.Because they like the dark
B.To save energy because food is hard to find
C.To grow more fur
D.Because they are bored
- 4.
What is the name of the green substance in leaves that helps plants trap sunlight?
A.Oxygen
B.Sugar
C.Chlorophyll
D.Pollen
- 5.
What do we call the relationship where one animal hunts and eats another animal?
A.Pollination
B.Predator and prey
C.Producer and consumer
D.Hibernation
- 6.
How do some trees protect themselves from being eaten by large animals?
A.By growing very slowly
B.By having sharp thorns on their branches
C.By moving to a different location
D.By turning their leaves into flowers
- 7.
Which type of habitat is characterized by having very few trees and being covered in grass?
A.Rainforest
B.Grassland
C.Tundra
D.Wetland
- 8.
Which of these describes a 'secondary consumer' in a meadow food chain?
A.A grasshopper that eats the clover.
B.A frog that eats the grasshopper.
C.A hawk that eats the snake that ate the frog.
D.The clover that uses the sun's energy.
- 9.
In a forest food web, if a disease kills most of the trees, why might the fish in a nearby stream also be affected?
A.The fish eat the leaves that fall from the trees.
B.Without trees, the soil washes into the stream, making the water too dirty for the fish and their food.
C.The trees provide the fish with oxygen through their roots in the water.
D.The fish will try to climb the dead trees to find food.
- 10.
Why is 'camouflage' considered an important adaptation for both a predator and a prey animal in a food chain?
A.It helps the predator hide from the sun and the prey find water.
B.It helps the predator sneak up on prey and helps the prey hide from the predator.
C.It makes the animals look more like the plants they want to eat.
D.It allows the animals to change their temperature to match the habitat.
Download the worksheet for Plants and Ecosystems - Habitats and Food Chains to practice offline. It includes additional chapter-level practice questions.