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ISC Class 12 Biology Solved Question Paper 2008

Short Answer Type

41.

Give one function and one deficiency symptom of the following :

Magnesium

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42.

Give one function and one deficiency symptom of the following :

Sulphur

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43.

Give one function and one deficiency symptom of the following :

Molybdenum

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44.

Define the following:

(i) Parthenocarpy
(ii) Root Pressure.

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45. Draw a labelled diagram of the longitudinal section of the human kidney.

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46. Briefly describe the events that occur during the luteal phase of the menstrual cycle.

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47.

Define:

(i) Peristalsis

(ii) Multiple fruits

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48. Explain the elongation of giraffe’s neck according to the theories of Lamarck and Darwin.

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49.
Define:

(i) Reproductive Isolation

(ii) Homologous Organs.

(i) Reproductive isolation is the prevention of interbreeding between the populations of two different species, whether they are geographically isolated or living close together. Some in built (genetic) mechanisms prevent them from interbreeding and producing fertile offsprings.

(ii) Homologous organs are those which have a common origin and are built on the same fundamental pattern, but they may have similar or different appearance due to similar or varied functions. Homology is exhibited by every organ system of vertebrates from lowest to highest including man.

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