CBSE Class 4 Science Lifecycle Worksheet

I. Label the parts of an egg
Answer: The parts of an egg from top to bottom / left to right as indicated by the pointer lines are:
1. Shell (outer protective covering)
2. Albumen (white fluid surrounding the yolk)
3. Yolk (yellow inner part that provides food for the growing baby)
4. Air sac (pocket of air usually at the wider end)
In simple words: An egg consists of an outer shell, a clear white albumen, a yellow yolk in the center, and an air sac.

Exam Tip: Memorize the four main parts of an egg and their specific locations for diagram-based labeling questions.

II. Write the stages of the life cycles of the following animals in the boxes provided.

1. Frog Lifecycle
Answer: The stages in the life cycle of a frog are:
- Stage 1: Eggs (Spawn)
- Stage 2: Tadpole
- Stage 3: Froglet (Young frog)
- Stage 4: Adult Frog
In simple words: A frog starts as eggs in water, hatches into a swimming tadpole, grows legs to become a froglet, and finally turns into an adult frog.

Exam Tip: Remember the correct sequence: Eggs - Tadpole - Froglet - Adult.

2. Butterfly Life Cycle
Answer: The stages in the life cycle of a butterfly are:
- Stage 1: Eggs (laid on a leaf)
- Stage 2: Larva (Caterpillar)
- Stage 3: Pupa (Chrysalis)
- Stage 4: Adult Butterfly
In simple words: A butterfly goes through four distinct stages: egg, caterpillar, pupa, and adult butterfly.

Exam Tip: The caterpillar stage is called larva and the resting stage is called pupa.

3. Life cycle of cockroach
Answer: The stages in the life cycle of a cockroach are:
- Stage 1: Egg
- Stage 2: Nymph
- Stage 3: Adult Cockroach
In simple words: Cockroaches have a three-stage life cycle consisting of egg, nymph, and adult. The nymph looks like a smaller adult without wings.

Exam Tip: Insects like cockroaches and grasshoppers do not have a pupa stage; their young ones are called nymphs.

4. Life cycle of house fly
Answer: The stages in the life cycle of a house fly are:
- Stage 1: Egg
- Stage 2: Larva (Maggot)
- Stage 3: Pupa
- Stage 4: Adult Fly
In simple words: A house fly passes through four stages: egg, maggot (larva), pupa, and adult. This complete change in form is called metamorphosis.

Exam Tip: Pay attention to the term metamorphosis which represents the transformation from larva to adult.

5. Life cycle of grasshopper
Answer: The stages in the life cycle of a grasshopper are:
- Stage 1: Egg
- Stage 2: Nymph
- Stage 3: Adult Grasshopper
In simple words: The grasshopper hatches from an egg into a nymph, which then grows into an adult grasshopper.

Exam Tip: Like the cockroach, the grasshopper has a 3-stage life cycle with a nymph stage instead of a caterpillar or pupa.