The Human Life Cycle

Science 4: Infancy, Childhood, Adolescence, Adulthood, & Natural Death

Grade 4 Science

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👶 1. Infancy 0 to 1 Year Rapid growth, milk diet, baby teeth emerge, learns to sit, crawl, and stand.

🧒 2. Childhood 2 to 11 Years Loses milk teeth; grows permanent teeth. Steady growth, language & school skills.

                        👟
                        3. Adolescence
                        12 to 18 Years
                        Puberty growth spurt, hormonal changes, voice deepens, adult physical features.
                    

💼 4. Adulthood 19 to 65+ Years Full physical maturity, career, family & parenting; wisdom and guidance.

                        🕊️
                        5. Death
                        End of Cycle
                        Natural end of biological life cycle; cells cease functioning; leaves legacy.
                    

Part A: Stage Identification Write the correct stage (Infancy, Childhood, Adolescence, Adulthood, or Death) on the blank.

1 Maria experiences a sudden growth spurt, bodily changes during puberty, and emotional development:

2 Baby Lucas drinks only breastmilk, learns how to roll over, and begins teething his first baby tooth:

3 Engineer Santos works at his job, provides for his family, and has reached his maximum adult height:

4 A Grade 4 pupil loses temporary baby teeth to make way for permanent teeth and learns sports:

5 The final stage of the biological life cycle when vital organs stop functioning naturally after old age:

6 A person at this stage is completely dependent on parents or caregivers for food, warmth, and mobility:

Part B: Life Cycle Principles Answer each question accurately based on the biological stages of humans.

7 Arrange the 5 human stages in chronological order from start to finish (use numbers 1 to 5):
[ ] Adulthood [ ] Infancy [ ] Death [ ] Childhood [ ] Adolescence

8 Why is Death considered a natural and necessary part of any living organism's life cycle?
A) It prevents the life cycle from repeating B) It recycles nutrients and makes room for new generations

Answer:

9 During which stage does an individual first gain the biological capacity to reproduce offspring?

10 True or False: Unlike insects that undergo metamorphosis, humans grow through direct development (a human baby has the same general body plan as an adult).

Complete Metamorphosis: The Butterfly

Science 4: Egg, Caterpillar (Larva), Pupa (Chrysalis / Cocoon), & Adult Butterfly

Grade 4 Science

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Concept Note Complete Metamorphosis involves 4 distinct body changes: Egg → Larva → Pupa → Adult. The larva looks totally different from the winged adult!

Stage A

🐛

Caterpillar (Larva)

Eats leaves voraciously. Grows fast and sheds its exoskeleton (molting).

Order (1-4):

Stage B

🥚

Egg

Tiny, round or oval egg laid by female butterfly securely under a host leaf.

Order (1-4):

Stage C

🦋

Adult Butterfly

Beautiful winged adult insect; drinks nectar from flowers; mates and lays eggs.

Order (1-4):

Stage D

🥥

Pupa (Chrysalis/Cocoon)

Resting/transformation stage; tissues break down and reassemble wings inside.

Order (1-4):

Part A: Scientific Analysis Write your answers clearly in the blank spaces provided.

1 What is the scientific term for the worm-like feeding stage of a butterfly?

2 What protective casing does a butterfly pupa form around itself during metamorphosis? (Chrysalis / Shell):

3 As a caterpillar eats leaves and grows bigger, it sheds its tight outer skin. This shedding process is called:

4 What is the main food source of the caterpillar versus the adult butterfly?
Caterpillar eats: | Adult butterfly sips:

Part B: True or False & Fact Check Write TRUE if the statement is correct; write FALSE if it is incorrect.

5 A butterfly pupa forms a smooth, hardened case called a chrysalis, while many moths spin a silk-wrapped cocoon.

6 Inside the pupa, the caterpillar is simply sleeping and does not change any of its body structures.

7 A newly emerged adult butterfly can fly immediately because its wings are already dry and rigid.

8 Why does the adult female butterfly lay eggs specifically on the underside of green leaves?
A) So the newly hatched larva has immediate food B) To keep the eggs warm under direct sunlight

Answer:

9 How many distinct stages does a butterfly undergo during its complete metamorphosis?

10 Which stage of the butterfly life cycle is primarily responsible for reproduction and laying eggs?

Amphibian & Avian Cycles: Frog & Chicken

Science 4: Water-to-Land Transformation vs. Direct Egg-to-Chick Development

Grade 4 Science

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🐸 Life Cycle of a Frog Metamorphosis

1. Jelly Eggs: Laid in clusters in ponds.
2. Tadpole: Swims with long tail; breathes through gills.
3. Froglet: Hind legs then front legs emerge; lungs develop; tail shrinks.
4. Adult Frog: Lives on land/water, breathes with lungs & skin.

🫧 → 🐟 → 🦎 → 🐸

🐔 Life Cycle of a Chicken Direct Growth

1. Shelled Egg: Kept warm (incubated) for 21 days.
2. Hatching: Chick pips hard shell using its egg tooth.
3. Chick: Covered in fluffy down; walks & pecks food.
4. Adult Hen / Rooster: Mature plumage, comb, wattle; hen lays eggs.

🥚 → 🐣 → 🐥 → 🐓

Section 1: Frog Metamorphosis Fill in each blank with the correct term (Gills / Lungs / Tadpole / Froglet / Water).

1 When a frog egg hatches, the young fish-like swimmer is called a:

2 A young tadpole breathes underwater using , but an adult frog breathes on land using and moist skin.

3 The transition stage between a tadpole and an adult frog that has legs and a shrinking tail is the:

4 What happens to the froglet's long tail as it transforms into a full adult frog?
A) It falls off into the water B) It is reabsorbed by the body for energy and nutrients

Answer:

Section 2: Chicken Growth Analyze how a chick develops and select or write the accurate scientific answer.

5 How many days does a mother hen typically incubate (sit on to warm) a fertilized egg before hatching?

days

6 What special temporary structure on the chick's beak is used to crack open the eggshell during hatching?

7 Unlike a tadpole, a newly hatched chick looks like a smaller version of its parents. This type of growth is:

Section 3: Compare & Contrast Write FROG, CHICKEN, or BOTH.

8 Lays jelly-covered eggs without hard shells directly into fresh water:

9 Lays hard calcium-shelled eggs on land that require parental body warmth to develop:

10 Begins its life cycle from a single fertilized egg cell produced by parent animals:

Life Cycles: Master Synthesis & Key

Science 4: Cross-Organism Matrix & Teacher / Parent Verification Guide

Grade 4 Science

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Master Synthesis Table Compare the 4 organisms studied across their essential life cycle characteristics.

Organism	Starting Form	Number of Stages	Type of Development	Young Looks Like Adult?
Human	Live Birth (Infancy)	5 Stages	Direct Development	Yes (Miniature proportions)
Butterfly	Egg on Leaf	4 Stages	Complete Metamorphosis	No (Caterpillar vs. Winged Adult)
Frog	Jelly Eggs in Water	4 Stages	Amphibian Metamorphosis	No (Tadpole has gills & tail)
Chicken	Shelled Egg on Land	3-4 Stages	Direct Development	Yes (Chick has beak & wings)

Teacher & Parent Verification Key Complete verified answers for grading and academic evaluation.

📄 Page 1: Human Life Cycle (10 Pts) DepEd Science 4 Competency

1. Adolescence

2. Infancy

3. Adulthood

4. Childhood

5. Death

6. Infancy

7. Order: 4 (Adulthood), 1 (Infancy), 5 (Death), 2 (Childhood), 3 (Adolescence)

8. B (Recycles nutrients & makes room for new generations)

9. Adolescence / Puberty (or Adulthood)

10. True (Direct development)

📄 Page 2: Butterfly Complete Metamorphosis (10 Pts) Order: Egg(1) → Caterpillar(2) → Pupa(3) → Adult(4)

Diagram Order: A=2 (Caterpillar), B=1 (Egg), C=4 (Adult), D=3 (Pupa)

1. Larva (or Caterpillar)

2. Chrysalis (pupa)

3. Molting

4. Caterpillar: Green leaves / foliage | Adult: Flower nectar

5. True (Chrysalis = butterfly; Cocoon = moth silk)

6. False (Major cellular remodeling occurs)

7. False (Wings are wet and crumpled; must pump fluid)

8. A (Immediate food supply for newly hatched larva)

9. 4 stages (Egg, Larva, Pupa, Adult)

10. Adult butterfly

📄 Page 3: Frog & Chicken Life Cycles (10 Pts) Comparative Metamorphosis vs Direct

1. Tadpole

2. Gills; Lungs (and moist skin)

3. Froglet

4. B (Reabsorbed by the body)

5. 21 days

6. Egg tooth

7. Direct development

8. FROG

9. CHICKEN

10. BOTH

💡 DepEd MATATAG Curriculum Alignment: Recognizes and describes the stages of development and life cycles of humans and other living things (insects, amphibians, and birds); demonstrates understanding of the continuity of life and ecological balance.

The Human Life Cycle

Complete Metamorphosis: The Butterfly

Amphibian & Avian Cycles: Frog & Chicken

Life Cycles: Master Synthesis & Key

📚 Related Worksheets in Grades 4 to 6 Intermediate

🎯 Curriculum Alignment & Teaching Guide