Grade 4 Science Lesson 2 Reproduction in Animals | Primary Science - Free Printable

Let's solve the problems step by step.

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F. Fill in the blanks

1. Animals which give birth to live babies are called
→ Viviparous animals
*Explanation:* Viviparous animals develop their offspring inside the mother’s body and give birth to live young ones (e.g., humans, dogs, whales).

2. Animals that lay eggs are called
→ Oviparous animals
*Explanation:* Oviparous animals lay eggs that hatch outside the mother’s body (e.g., birds, reptiles, most fish).

3. The four stages of an insect's life cycle are
→ Egg, Larva, Pupa, Adult
*Explanation:* This is the complete metamorphosis life cycle seen in insects like butterflies and beetles.
- Egg → hatches into a larva (like caterpillar)
- Larva → grows and molts
- Pupa → transformation stage (chrysalis or cocoon)
- Adult → emerges fully formed

4. The process of giving birth to the young ones of similar kind is called
→ Reproduction
*Explanation:* Reproduction is the biological process by which new individual organisms are produced from their parents.

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G. Encircle the animals that lay eggs

We need to identify which of the listed animals are oviparous (lay eggs).

List:
- Human → ✘ (viviparous – gives birth to live babies)
- Goat → ✘ (viviparous)
- Crocodile → ✔ (lays eggs)
- Snake → ✔ (most snakes lay eggs; some give live birth, but generally considered oviparous)
- Elephant → ✘ (viviparous)
- Insect → ✔ (most insects lay eggs)
- Kangaroo → ✘ (marsupial, gives birth to underdeveloped young, not eggs)
- Parrot → ✔ (bird – lays eggs)
- Pig → ✘ (viviparous)
- Sparrow → ✔ (bird – lays eggs)
- Turtle → ✔ (lays eggs)
- Whale → ✘ (viviparous – gives birth to live young)

✔ Animals that lay eggs:
Crocodile, Snake, Insect, Parrot, Sparrow, Turtle

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✔ Final Answers:

#### F. Fill in the blanks
1. Viviparous animals
2. Oviparous animals
3. Egg, Larva, Pupa, Adult
4. Reproduction

#### G. Encircle the animals that lay eggs
Crocodile, Snake, Insect, Parrot, Sparrow, Turtle

> ✔ These should be circled in the worksheet.