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ISC Class 12 Biology Solved Question Paper 2008

Short Answer Type

Mention one significant difference between each of the following :

Anticlinal and Periclinal cell division

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Mention one significant difference between each of the following :

Ureotelism and Uricotelism

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Mention one significant difference between each of the following :

Tubectomy and Vasectomy

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(a) Mention one significant difference between each of the following :

Photo-oxidation and Photorespiration

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Mention one significant difference between each of the following :

Ontogeny and Phylogeny

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Explain why :

Salt is added in excess to pickles.

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7.
Explain why :

A large percentage of carbon dioxide forms carbonic acid within the RBCs whereas very little carbon dioxide forms carbonic acid in the plasma.

When carbon dioxide diffuses into the blood plasma and then into the red blood cells (erythrocytes) in the presence of the catalyst carbonic anhydrase most CO₂ reacts with water in the erythrocytes. Since the RBCs contain sufficient amount of carbonic anhydrase enzyme, which catalyses the reaction between carbon dioxide and water and helps in transport of carbon dioxide from tissues to the lungs. However, the plasma does not have the enzyme and thus no carbonic acid formation takes place there.

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