10 BS FA 2 EM KEY 2026

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                            10 Class  BIOLOGY - FA 2 (OCT 2025) – KEY

SECTION – I (5 × 1 = 5)

1. Which part of the brain maintains posture and equilibrium of the body?

  • Cerebellum

2. Expand DNA

  • Deoxyribo Nucleic Acid

3. Name the asexual reproduction method depicted in the picture.

        



  • Binary fission in Leishmania

4. The gap between two Nerve cells is called [ ]

  • Synapse

5. Write a slogan to aware people against female foeticide.

  • A daughter is a blessing, not a burden — let her live!

  • Save the girl child, save the future!

SECTION – II (3 × 2 = 6)

6. What are the functions of testes?

  • Produce sperms (male gametes)

  • Secrete testosterone hormone

  • Control male reproductive organs

  • Develop secondary sexual characters

7. Study the given information and answer the following questions.

i) Which plant hormone helps to get long plans?

  • Gibbarellin

ii) which plant hormone is responsible for shedding of leaves?

  • Abscisic acid

8. What precautions do you take to maintain proper thyroxine levels in the blood?

  • Use iodised salt

  • Eat balanced diet

  • Go for regular medical check-ups

SECTION – III (4 × 4 = 16)

9. What is the importance of DNA copying in reproduction?

  • Passes genetic information to offspring

  • Makes offspring similar to parents

  • Creates variations

  • Helps in growth and repair

  • Maintains continuity of life

  • Ensures proper development

10. Do plants respond to stimuli? Justify your answer with suitable examples.

  • Yes, plants respond to stimuli

Examples:

  • Phototropism – stem bends towards light

  • Geotropism – roots grow downward

  • Thigmotropism – tendrils coil around support

  • Hydrotropism – roots grow towards water

  • Chemotropism – pollen tube grows towards ovule

11. What problems might arrive receptors do not function properly?

  • Cells fail to receive signals

  • Hormonal imbalance occurs

  • Growth and metabolism get disturbed

  • May cause diseases like diabetes

  • Loss of sensation increases injury risk

12. Draw a neat labelled diagram of the female reproductive system.

SECTION – IV (1 × 8 = 8)

13. A) How do you demonstrate the photo tropism in plants?

  • Aim

    To demonstrate plant growth towards light.

     


    Apparatus

    Flask, water, wire mesh, germinating seeds, cardboard box.

    Procedure

    1.        Fill flask with water

    2.        Cover with wire mesh

    3.        Place germinating seeds on wire mesh

    4.        Keep in one side open cardboard box

    5.        Face box towards light

    6.        Shoots bend towards light

    7.        Rotate flask opposite

  • Observation

  • Shoots bend towards light showing positive phototropism.
    Even after rotation, shoots again grow towards light.

     Result: Light influences the direction of shoot growth.

(OR)

B) Distinguish between pollination and fertilization.

Pollination

  • Transfer of pollen to stigma

  • Happens before fertilization

  • Takes place outside ovary

  • No seed formed

Fertilization

  • Fusion of male and female gametes

  • Happens after pollination

  • Takes place inside ovary

  • Seed and fruit formed