Class 4 Science Reproduction in Animals Worksheet Answers | MCQs, Fill in the Blanks, True False, Match the Following & Question Answers
A. Tick (✓) the Right Answer
1. The white jelly-like substance present in an egg is called __________.
Answer: (d) Albumen ✅
2. Which of the following is not a mammal?
Answer: (b) Frog ✅
3. Which of the following lays eggs?
Answer: (c) Snake ✅
4. Whose life cycle shows metamorphosis?
Answer: (a) Human ❌ (Correct Answer: Butterfly) (The printed options appear incorrect. Based on the chapter, metamorphosis is shown by the butterfly.)
5. Birds sit on their eggs to keep them __________.
Answer: (d) Warm ✅
B. Fill in the Blanks
Words: albumen, birds, reptiles, cocoon, spawn
1. Lizards, turtles and snakes form a group of animals called __________.
Answer: reptiles
2. Eggs are laid in a cluster called __________.
Answer: spawn
3. The larva of a butterfly builds a __________ around itself.
Answer: cocoon
4. __________ protects the growing embryo and is rich in protein.
Answer: albumen
5. __________ lay their eggs in their nests.
Answer: birds
C. Write ‘T’ for True and ‘F’ for False Statements
1. The young one of a butterfly that hatches out of the egg is called pupa.
Answer: False (F)
2. Birds, reptiles, fish and insects reproduce by laying eggs.
Answer: True (T)
3. Babies of elephants are not looked after by the parents.
Answer: False (F)
4. Frogs need a water body in their surroundings to be able to reproduce.
Answer: True (T)
5. The young birds develop and grow outside the eggs.
Answer: False (F)
D. Match the Following
| Column A | Column B |
| 1. Butterfly | (c) Insect |
| 2. Snake | (e) Lays eggs on ground or in hole |
| 3. Tadpole | (a) Grows into frog |
| 4. Fish | (b) Most eggs are eaten by others |
| 5. Spawn | (d) Cluster of eggs |
A. Short Answer Questions
1. What is reproduction?
Answer:
Reproduction is the process by which living organisms produce young ones of their own kind.
2. What is hatching?
Answer:
Hatching is the process by which a fully developed baby animal breaks the egg shell and comes out.
3. What is incubation period?
Answer:
The incubation period is the time during which birds sit on their eggs to keep them warm until they hatch.
4. Define metamorphosis.
Answer:
Metamorphosis is the process in which a young animal changes into an adult through different stages of development.
B. Long Answer Questions
1. Explain the parts of an egg with the help of a diagram.
Answer:
A bird’s egg has four main parts:
- Shell: The hard outer covering that protects the egg.
- Albumen: The white jelly-like substance rich in protein that protects the embryo.
- Yolk: The yellow part that stores food for the developing baby.
- Embryo: The tiny developing baby bird.
2. Write about two ways by which animals reproduce.
Answer:
Animals reproduce in two ways:
- By laying eggs: Birds, reptiles, insects, frogs and fish lay eggs. The babies hatch from the eggs after a certain period.
- By giving birth: Mammals such as humans, cows, dogs and elephants give birth to fully developed babies and feed them with milk.
3. Write some special features of mammals.
Answer:
- Mammals give birth to babies.
- Mothers feed their babies with milk.
- Most mammals have hair on their bodies.
- They breathe through lungs.
- They take care of their young ones.
4. Describe the life cycle of a butterfly.
Answer:
The butterfly has four stages in its life cycle:
- Egg
- Caterpillar (Larva)
- Pupa (inside a cocoon)
- Adult Butterfly
This process is called metamorphosis.
5. Describe the life cycle of a frog with the help of a diagram.
Answer:
Life Cycle of Frog
Eggs (Spawn) → Tadpole → Tadpole with Legs → Young Frog → Adult Frog
A frog lays eggs in water. The eggs hatch into tadpoles that breathe through gills. As they grow, they develop legs, lose their tails and finally become adult frogs.
6. Write a short note on parental care shown by some animals.
Answer:
Many mammals take care of their babies after birth. They feed them with milk, protect them from danger, keep them clean and teach them how to find food and live independently. Birds also care for their eggs and chicks by keeping the eggs warm and feeding the young ones after hatching.
C. HOTS Questions
1. Fish and frogs cannot reproduce in the absence of water. Why?
Answer:
Fish and frogs lay their eggs in water. Their eggs and young ones need water to survive and develop. Therefore, they cannot reproduce without water.
2. Why do birds sit on their eggs for some time?
Answer:
Birds sit on their eggs to keep them warm during the incubation period so that the embryos can develop properly and hatch.
3. A fish-like animal gives birth to babies instead of laying eggs. The first letter of its name is in “DOG” but not in “FOG”. Name the animal.
Answer:
Dolphin
4. A frog can live on land but a tadpole cannot. Why?
Answer:
A tadpole breathes through gills and lives only in water. An adult frog develops lungs and can breathe on land as well as in water.