Subject

Biology

Class

ICSE Class 12

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31. Explain four functions of the liver.

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32. Write four advantages of cross pollination over self pollination.

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33. Explain the mechanism of hearing by the human ear.

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34.

Differentiate between :

(i) Reparative and Restorative regeneration.

(ii) Capacitation and fertilization.

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35. Name the second and tenth cranial nerves and write one function of each.

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36.

Give one difference between:

(i) Intraspecific struggle and Interspecific struggle.

(ii) Somatogenic variation and Blastogenic variation.

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37.

(a) Give the anatomical differences between a dicot leaf and a monocot leaf.

(b) Enlist the functions of mineral elements in the life of a plant. What do you mean by essentiality of an element ?

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38.

Describe the internal structure of the human heart.

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39. Explain the counter-current system in the nephron.

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Non-Cyclic Photophosphorylation	Cyclic Photophosphorylation
Involves both photosystems, PS I & PS II	Involves only PS I
Both ATP & NADPH formed.	Only ATP formed.
Oxygen is liberated as a result of photolysis of water.	O₂ is not liberated.
The Electron expelled by reaction centre pigment molecule is not returned back to it.	The Electron expelled by reaction centre returns back to it.
Water is consumed in process.	Water is not consumed in the process.