1. A
   They are unicellular.
2. B
   They are multicellular.
3. C
   They reproduce sexually.
4. D
   They reproduce asexually.

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1. A
   B and C
2. B
   A and C
3. C
   C and D
4. D
   All of these

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1. A
   Pons
2. B
   Medulla
3. C
   Cerebrum
4. D
   Cerebellum

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1. A
   Cell body → dendrite → axon → axonal end.
2. B
   Dendrite → cell body → axon → axonal end
3. C
   Axonal end → axon → cell body → dendrite
4. D
   Dendrite → axon → axonal end → cell body.

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1. A
   Glucagon
2. B
   Insulin
3. C
   Thyroxin
4. D
   Adrenaline

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1. A
   Thymus gland
2. B
   Testis
3. C
   Pineal gland
4. D
   Ovary

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1. A
   Iron is essential for the synthesis of thyroxin
2. B
   Thyroxin is also called thyroid hormone
3. C
   It regulates carbohydrates, protein and fat metabolism in the body
4. D
   Thyroid gland requires iodine to synthesise thyroxin

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1. A
   Mid brain
2. B
   Fore brain
3. C
   Hind brain
4. D
   Temporal lobe

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1. A
   Mid brain
2. B
   Cerebrum
3. C
   Pons
4. D
   Medulla oblongata

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1. A
   Cytokinin
2. B
   Abscisic acid
3. C
   Gibberellin
4. D
   Auxin

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1. A
   Cell body
2. B
   Neuromuscular junction
3. C
   Dendrites
4. D
   Axon

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1. A
   bones of the receptor organ
2. B
   spinal cord
3. C
   muscles of the effector organ
4. D
   brain

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1. A
   Oestrogen
2. B
   Thyroxin
3. C
   Insulin
4. D
   Cytokinin

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1. A
   Nerve impulse travels from dendritic end towards axonal end
2. B
   At the dendritic end electrical impulses bring about the release of some chemicals which generate an electrical impulse at the axonal end of another neuron
3. C
   A neuron transmits electrical impulses not only to another neuron but also to muscle and gland cells
4. D
   The chemicals released from the axonal end of one neuron cross the synapse and generate a similar electrical impulse in a dendrite of another neuron

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1. A
   B and C
2. B
   A and B
3. C
   A, B and D
4. D
   All of these

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1. A
   Beating of the heart
2. B
   Watering of the mouth
3. C
   Jumping from a height
4. D
   Blinking of the eyes

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1. A
   A synapse
2. B
   A joint
3. C
   Junction point
4. D
   Constant bridge

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1. A
   Pituitary gland
2. B
   Adrenal gland
3. C
   Parathyroid gland
4. D
   Mucus gland

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1. A
   Decrease the blood sugar
2. B
   All of these
3. C
   Regulate the metabolism of fat
4. D
   Increase the blood sugar

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1. A
   promote cell division
2. B
   increase the length of cells
3. C
   promote growth of stem
4. D
   inhibit growth

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1. A
   Skull
2. B
   Cranium
3. C
   Brain
4. D
   Tissue

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1. A
   Excess secretion of adrenaline
2. B
   Excess secretion of growth hormone
3. C
   Under secretion of thyroxin
4. D
   Under secretion of growth hormone

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1. A
   Differentiate the taste of an apple form that of an ice – cream
2. B
   Differentiate the smell of a perfume from that of an agarbatti
3. C
   Differentiate a hot object form a cold object
4. D
   Differentiate red light from green light

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1. A
   It develops from the parent body as soon as it is produced
2. B
   It forms due to repeated cell division at one specific site.
3. C
   It is an outgrowth.
4. D
   It becomes a new independent individual.

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1. A
   impulse
2. B
   dendrite
3. C
   axon
4. D
   synapse

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