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• AIPMT 2010 Biology

AIPMT 2010 Biology

Q. 11.    The common nitrogen-fixer in paddy fields is:

1. Rhizobium
2. Azospirillum
3. Oscillatoria
4. Frankia

Answer: (2)

Q. 12.    Which two of the following changes (a − d) usually tend to occur in the plain dwellers when they move to high altitudes (3,500 m or more)?

1. Increase in red blood cell size
2. Increase in red blood cell production
3. Increased breathing rate
4. Increase in thrombocyte count Changes occurring are :
   (1)    (b) and (c)     (2)   (c) and (d)   (3)    (a) and (d)   (4)    (a) and (b)

Answer: (1)

Q. 13. What is true about RBCs in humans?

1. They carry about 20 − 25 per cent of CO₂
2. They transport 99.5 per cent of O₂
3. They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma
4. They do not carry CO₂ at all

Answer: (1)

Q. 14. The main arena of various types of activities of a cell is:

1. Plasma membrane
2. Mitochondrian
3. Cytoplasm
4. Nucleus

Answer: (3)

Q. 15. If for some reason our goblet cells are non-functional, this will adversely affect:

1. production of somatostatin
2. secretion of sebum from the sebaceous glands
3. maturation of sperms
4. smooth movement of food down the intestine

Answer: (4)

Q. 16.    The plasma membrane consists mainly of:

1. phospholipids embedded in a protein bilayer
2. proteins embedded in a phospholipid bilayer
3. proteins embedded in a polymer of glucose molecules
4. proteins embedded in a carbohydrate bilayer

Answer: (2)