Biology Multiple Choice Questions and Answers for Different Competitive Exams

Multiple Choice Questions on Transport in Plants

1. Which one of the following theories for ascent of sap was proposed by eminent Indian scientist J. C Bose?
a) Pulsation theory
b) Transpiration Pull theory
c) Root pressure theory
d) Atmospheric pressure theory

2. Munch hypothesis is based on
a) Translocation of food due to TP gradient and imbibitions force
b) Translocation of food due to turgor pressure (TP) gradient
c) Translocation of food due to imbibitions force
d) None of the above

3. The first process by which water enters into the seed coat when a seed is placed in a suitable environment for germination is
a) Osmosis
b) Active transport
c) absorption
d) Imbibition

4. Which of the following plant material, is an efficient water imbibant?
a) lignin
b) agar
c) pectin
d) cellulose

5. Which of the following experiment is called physiological demonstration of osmosis?
a) Thistle funnel- whose mouth is tied with egg membrane
b) Thistle funnel- whose mouth is tied with parchment paper
c) bell jar experiment
d) potometer

6. Water is lost in a liquid state in some plants through hydathodes. These hydathodes
guttation
a) Remain closed at night
b) Remain closed during day
c) Remain always open
d) Do not show any specificity in opening and closing

7. Passive absorption of water by the root system is the result of
a) Forces created in the cells of the root
b) Increased respiratory activity in root cells
c) Osmotic force in the shoot system
d) Tension on the cell sap due to transpiration


8. Which of the following helps in ascent of sap?
a) Root pressure
b) Transpiration
c) Capillarity
d) all of above

9. The translocation of organic solutes in sieve tube members is supported by
a) cytoplasmic streaming
b) P proteins
c) mass flow involving a carrier and ATP
d) root pressure and transpiration pull

10. Potometer works on the principle of
a) Osmotic pressure
b) Root pressure
c) Amount of water absorbed equals the amount transpired
d) potential difference between the tip of the tube and that of the plant.

Learn more:
Answers
1. a) Pulsation theory
2. b) Translocation of food due to turgor pressure (TP) gradient
3. d) Imbibition
4. b) agar
5. b) Thistle funnel- whose mouth is tied with parchment paper
6. c) Remain always open
7. d) Tension on the cell sap due to transpiration
8. d) all of above
9. b) P proteins
10. c) Amount of water absorbed equals the amount transpired


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