Plant physiology is a branch in Botany concerning with the physiological functions or processes of plants. Precisely, it is a descriptive study of variation and structure of plants at the cellular and molecular level leading to ecological, physiological and biochemistry associated viewpoints of plants exploration.
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1. In the rainy season, doors get swelled up due to
(a) Transpiration
(b) Imbibition
(c) Diffusion
(d) Respiration
Answer: (b)
2. This statement regarding enzyme inhibition is correct
(a) non-competitive inhibitors often bind to the enzyme irreversibly
(b) non-competitive inhibition of an enzyme can be overcome by adding a large amount
of substrate
(c) competitive inhibition is observed when substrate and inhibitor compete for the active site
on enzyme
(d) competitive inhibition is observed when substrate competes with an enzyme to bind
to an inhibitor protein
Answer: (c)
3. In C3 and C4 plants, primary carboxylation takes place with the help of
(a) PEP carboxylse and pyruvate carboxylase
(b) RuBP carboxylase and PEP carboxylase
(c) PEP carboxylase and RuBP carboxylase
(d) RuBP carboxylase and pyruvate carboxylase
Answer: (b)
4. Peroxisomes are involved in which type of reactions pertaining to plant photosynthesis?
(a) Calvin Cycle
(b) Glycolytic cycle
(c) Glyoxylate cycle
(d) Bacterial photosynthesis
Answer: (c)
5. The fundamental feature of Kranz Anatomy of C4 plants is
(a) Presence of agranal chloroplasts in bundle sheath cells and granal chloroplasts in mesophyll cells
(b) Presence of granal chloroplasts in bundle sheath cells and agranal chloroplasts in mesophyll cells
(c) Presence of chloroplasts in epidermal and mesophyll cells
(d) Presence of agranal chloroplasts in both mesophyll and bundle sheath cells
Answer: (a)
6. The statement which is incorrect with respect to enzyme action is
(a) Addition of a lot of succinates does not reverse the inhibition of succinic dehydrogenase
by malonate
(b) the substrate binds with the enzyme as its active site
(c) a non-competitive inhibitor binds the enzyme at a site distinct from that which binds
the substrate
(d) malonate is a competitive inhibitor of succinic dehydrogenase
Answer: (a)
7. A phosphoglyceride is always composed of
(a) only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate
the group is also attached
(b) only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
(c) an unsaturated or saturated fatty acid esterified to a phosphate molecule to which a
glycerol molecule is also attached
(d) an unsaturated or saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
Answer: (d)
8. Macromolecule chitin is
(a) phosphorous containing polysaccharide
(b) nitrogen containing polysaccharide
(c) sulphur containing polysaccharide
(d) simple polysaccharide
Answer: (b)
9. This is a wrongly matched pair
(a) Alcohol – Nitrogenase
(b) Detergents – Lipase
(c) Textile – Amylase
(d) Fruit juice – Pectinase
Answer: (a)
10. The most abundant protein in the animal world is
(a) Trypsin
(b) Collagen
(c) Haemoglobin
(d) Insulin
Answer: (b)
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