All India Institute of Medical Sciences 2008 - Question Paper

Q. 39. The wavelength of light absorbed by Pr form of phytochrome is:
a. 620 nm
b. 640 nm
c. 680 nm
d. 720 nm
Sol. The Pr form of phytochrome receives red light (600-680 nm) and modifications into Pfr. accurate choice: (3)
Q. 40. Opening of floral buds into flowers, is kind of:
a. Autonomic movement of growth
b. Autonomic movement of locomotion
c. Autonomic movement of variation
d. Paratonic movement of growth.
Sol. Opening of floral bud into flowers, is due to epinasty, a kind of autonomic movement of growth. accurate choice: (1)
Q. 41. Which 1 of the subsequent pairs, is not correctly matched?
a. IAA - Cell wall elongation
b. Abscissic Acid - Stomatal closure
c. Gibberellic Acid - Leaf fall
d. Cytokinin - Cell division
Sol. Leaf fall is due to interaction of auxin and ethylene. accurate choice: (3)
Q. 42. 1 gene - 1 enzyme relationship was established for the 1st time in:
a. Diploccus pneumoniae
b. Neurospora crassa
c. Salmonella typhimurium
d. Escherichia Coli
Sol. 1 gene-one enzyme hypothesis was provided by Beadle and Tatum in red mould (Neurospora crassa). accurate choice: (2)
Q. 43. Male gametes in angiosperms are formed by the division of:
a. Microspore mother cell
b. Microspore
c. Generative cell
d. Vegetative cell
Sol. During the development of male gametophyte 1st of all 2 cells – generative cell and tube nucleus are formed from a pollen. This twocelled stage is called pollen grain. Finally the generative cell divides to form 2-male gametes. accurate choice: (3)
Q. 44. 2 cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure - 7atm and diffusion pressure deficit three atm. Cell B has osmotic pressure eight atm, turgor pressure three atm and diffusion pressure deficit five atm. The outcome will be:
a. Movement of water of Cell A to B
b. Movement of water from Cell B to A
c. No movement of water
d. Equilibrium ranging from the 2
Sol. The direction of movement of water is from low to high DPD. accurate choice: (1)
Q. 45. In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of:
a. Epidermis
b. Mesophyll
c. Bundle Sheath
d. Phloem
Sol. In C4 plants, C4 cycle occurs in mesophyll cells and C3 cycle in bundle sheath cells. accurate choice: (2)
Q. 46. Which of the subsequent is a flowering plant with nodules containing filamentous nitrogen-fixing microorganism?

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