1. A
   22 + XX
2. B
   44 + XY
3. C
   44 + XX
4. D
   22 + XY

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1. A
   (B)
2. B
   (C)
3. C
   (A)
4. D
   (D)

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1. A
   stigma
2. B
   sepal
3. C
   ovule
4. D
   pollen grain

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1. A
   growth of body
2. B
   changes in hair pattern
3. C
   menstruation
4. D
   change in voice

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1. A
   Slack
2. B
   Scion
3. C
   stem
4. D
   stalk

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1. A
   Fallopian Tubes
2. B
   Vas deferens
3. C
   Uterus
4. D
   Ovary

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1. A
   maintain growth
2. B
   continue the species generation after generation
3. C
   keep the individual organism alive
4. D
   fulfil their energy requirement

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1. A
   Heavy, sticky
2. B
   Light, spongy
3. C
   Light, sticky
4. D
   Spongy, heavy

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1. A
   Statement (i) is correct.
2. B
   Statement (ii) is correct.
3. C
   Statement (iii) is correct.
4. D
   Statement (iv) is correct.

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1. A
   multiple fission
2. B
   budding
3. C
   binary fission
4. D
   reduction division

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1. A
   Flowers are small with nectar and fragrance.
2. B
   Pollen grains are light, small and dusty whereas the stigma is hairy and feathery.
3. C
   Pollen grains are heavy and dry whereas the stigma is short and sticky.
4. D
   Flowers are brightly coloured.

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1. A
   DNA copying is not accompanied by the creation of cellular apparatus.
2. B
   sexual reproduction is a lengthy process.
3. C
   genetic material is contributed by two individuals of same species to produce a new generation.
4. D
   genetic material is contributed by many parents.

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1. A
   Macropropagation
2. B
   Artificial vegetative propagation
3. C
   Micropropagation
4. D
   Natural vegetative propagation

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1. A
   Fishes
2. B
   Birds
3. C
   Reptiles
4. D
   Amphibians

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1. A
   Male gamete, Polar nucleus
2. B
   Female gamete, Secondary nucleus
3. C
   Polar nucleus, Secondary nucleus
4. D
   Male gamete, Female gamete

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1. A
   Fallopian tubes
2. B
   Ovary
3. C
   Uterus
4. D
   Vagina

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1. A
   Urethra
2. B
   Syphilis
3. C
   Gonorrhea
4. D
   HIV

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1. A
   Hermaphrodite
2. B
   intersex
3. C
   Dioecious
4. D
   Monoecious

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1. A
   Statement (ii) is correct.
2. B
   Statement (iii) is correct.
3. C
   Statement (i) is correct.
4. D
   Statement (iv) is correct.

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1. A
   Support life
2. B
   Hold organic matter
3. C
   Hold water
4. D
   Decay organic matter

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1. A
   sepals only
2. B
   petals only
3. C
   petals and Sepals
4. D
   anther and Stigma

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1. A
   Oxytocin
2. B
   Estrogen
3. C
   Thyroxin
4. D
   Progesterone

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1. A
   Gram, maize and ground - nut
2. B
   Wheat, gram and pea
3. C
   Gram, pea and ground - nut
4. D
   Maize, pea and barley

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1. A
   Hyphae
2. B
   Filaments
3. C
   Sporangia
4. D
   Rhizoids

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1. A
   halving of chromosomes after zygote formation.
2. B
   doubling of chromosomes after zygote formation.
3. C
   halving of chromosomes at the time of gamete formation.
4. D
   doubling of chromosomes before gamete formation.

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