CBSE Class 11 Biology Transport In Plants Assignments

Question. In rainy season, door gets swelled due to
(a) imbibition
(b) diffusion
(c) transpiration
(d) respiration
Answer. A

Question. Which of the following helps in ascent of sap?
(a) Root pressure
(b) Transpiration
(c) Capillarity
(d) All of these
Answer. D

Question. In terrestrial habitats, temperature and rainfall conditions are influenced by
(a) water transformations
(b) transpiration
(c) thermoperiodism
(d) translocation. 
Answer. B

Question. Which of the following is used to determine the rate of transpiration in plants?
(a) Porometer/Hygrometer
(b) Potometer
(c) Auxanometer
(d) Tensiometer/Barometer 
Answer. B

Question. The most widely accepted theory for ascent of sap in trees is
(a) capillarity
(b) role of atmospheric pressure
(c) pulsating action of living cell
(d) transpiration pull and cohesion theory of Dixon and Jolly. 
Answer. D

Question. Stomata open and close due to
(a) circadian rhythm
(b) genetic clock
(c) pressure of gases inside the leaves
(d) turgor pressure of guard cells. 
Answer. D

Question. Phenyl mercuric acetate (PMA) results in
(a) reduced photosynthesis
(b) reduced transpiration
(c) reduced respiration
(d) killing of plants. 
Answer. B

Question. Transpiration is least in
(a) good soil moisture
(b) high wind velocity
(c) dry environment
(d) high atmospheric humidity. 
Answer. D

Question. Translocation of organic materials in plants is explained by 
(a) active transport
(b) transpiration pull
(c) inhibition theory
(d) mass flow hypothesis
Answer. A

Question. When water enters in roots due to diffusion, is termed as
(a) osmosis
(b) passive absorption
(c) endocytosis
(d) active absorption.
Answer. B

Question. A botanist discovered a mutant plant that was unable to produce materials that form casparian strip. This plant would be 
(a) unable to transport water or solutes to the leaves.
(b) unable to use its sugar as a sugar sink.
(c) able to exert greater root pressure than the normal plant.
(d) unable to control amounts of water and solutes it absorbs.
Answer. D

Question. Poisons like cyanide inhibit Na+ efflux and K+ influx during cellular transport. This inhibitory effect is reversed by an injection of ATP. This demonstrates that
(a) ATP is the carrier protein in the transport system
(b) energy for Na+-K+ exchange pump comes from ATP
(c) ATP is hydrolysed by ATPase to release energy
(d) Na+-K+ exchange pump operates in the cell.
Answer. A

Question. Minerals absorbed by root move to the leaf through
(a) xylem
(b) phloem
(c) sieve tubes
(d) none of the above.
Answer. A

Question. What is the direction of movement of sugars in phloem?
(a) Bi-directional
(b) Non-multidirectional
(c) Upward
(d) Downward 
Answer. A

Question. A few drops of sap were collected by cutting across a plant stem by a suitable method. The sap was tested chemically. Which one of the following test results indicates that it is phloem sap?
(a) Acidic
(b) Alkaline
(c) Low refractive index
(d) Absence of sugar 
Answer. B

Question. In a ring girdled plant
(a) the shoot and root die together
(b) neither root nor shoot will die
(c) the shoot dies first
(d) the root dies first. 
Answer. D

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

Question. Loading of phloem is related to
(a) increase of sugar in phloem
(b) elongation of phloem cell
(c) separation of phloem parenchyma
(d) strengthening of phloem fiber. 
Answer. A

Question. Bidirectional translocation of solutes takes place in
(a) parenchyma
(b) cambium
(c) xylem
(d) phloem. 
Answer. D

Question. Translocation of carbohydrate nutrients usually occurs in the form of
(a) glucose
(b) maltose
(c) starch
(d) sucrose. 
Answer. D

Question. Which is correct about transport of conduction of substances?
(a) Organic food moves up through phloem
(b) Organic food moves up through xylem
(c) Inorganic food moves upwardly and downwardly through xylem
(d) Organic food moves upwardly and downwardly through phloem 
Answer. D

Question. Death of protoplasm is a pre-requisite for a vital function like
(a) transport of sap
(b) transport of food
(c) absorption of water
(d) gaseous exchange.
Answer. A

Question. Which of the following statements is/are not incorrect? 
(i) Water and minerals, and food are generally moved by a mass or bulk flow system.
(ii) Bulk flow can be achieved either through a positive hydrostatic pressure gradient or a negative hydrostatic pressure gradient.
(iii) The bulk movement of substances through the conducting tissues of plants is called translocation.
(iv) Xylem translocates organic and inorganic solutes, mainly from roots to the aerial parts of the plants.
(v) Phloem translocates water, mineral salts,some organic nitrogen and hormones, from the leaves to other parts of the plants.
(a) (ii), (iii) and (v)
(b) (ii), (iii) and (iv)
(c) (iv) and (v)
(d) (ii) and (v)
Answer. C