MCQs Biology F.Sc. Part 2 ( 2nd Year )
Chapter No.17
Coordination and Control
Total MCQs = 219
All MCQs taken from Old MDCAT Tests
11. Cireadian rhythms are based on approximately a:
(A) 2-hour period
(B) 7-day period
(C) 24-hour period
(D) 365-day period
Answer:
(C) 24-hour period
12. The production of fructants by plants is response to:
(A) Water deficit
(B) Salt stress
(C) Cold stress
(D) Heat stress
Answer:
(C) Cold stress
13. The formation of air tubes in submerged roots is an adaptation to:
(A) Water stress
(B) Oxygen deprivation
(C) Salt stress
(D) Herbivory
Answer:
(B) Oxygen deprivation
14. Which of the followings describes a plant response to heat stress?
(A) Production of heat shock proteins
(B) Closing of stomata
(C) Production of abscisic acid
(D) Production of fructants
Answer:
(A) Production of heat shock proteins
15. The first line of defense against pathogen is
(A) Gene for gene-recognition
(B) Production of oligosaccharides
(C) Production of phytoalexins
(D) Physical barrier of epidermis
Answer:
(D) Physical barrier of epidermis
16. Auxin causes:
(A) Promotion of apical dominance
(B) Formation of adventitious roots
(C) Growth of fruit
(D) All of the choices are correct
Answer:
(D) All of the choices are correct
17. In combination with auxin, it stimulates cell division in plants and determines the course of differentiation:
(A) Ethylene
(B) Gibbercllins
(C) Abscisic acid
(D) Cytokinin
Answer:
(D) Cytokinin
18. Foolish seedling disease in rice is caused by:
(A) Ethylene
(B) Gibberellins
(C) Abscisic acid
(D) Cytokinin
Answer:
(B) Gibberellins
19. One of the most important uses of auxin is the:
(A) Initiation of abscission
(B) Stimulation of abscission
(C) Prevention of abscission
(D) Acceleration of abscission
Answer:
(C) Prevention of abscission
20. Abscisic acid:
(A) Induces bud dormancy
(B) Causes the stomata to close
(C) Promotes senescence
(D) All of the choices are correct
Answer:
(D) All of the choices are correct
