1. What is the main role of cytokinins in nutrient mobilization?
A.
They promote the movement of nutrients toward areas of active growth
B.
They stop all nutrient movement in the plant
C.
They convert nutrients into sunlight
D.
They remove nutrients from growing tissues
Correct Answer:
They promote the movement of nutrients toward areas of active growth
Explanation:
Cytokinins help mobilize nutrients by directing them toward tissues where active growth and development are occurring.
2. Cytokinins generally cause nutrients to accumulate in which plant regions?
A.
Actively growing regions
B.
Dead tissues only
C.
Dry seed coats only
D.
Old xylem vessels only
Correct Answer:
Actively growing regions
Explanation:
Nutrient mobilization by cytokinins supplies actively growing regions, such as young leaves and developing tissues.
3. Which process is directly promoted by cytokinins during nutrient mobilization?
A.
Transfer of nutrients to treated tissues
B.
Permanent storage of nutrients in roots
C.
Destruction of mineral nutrients
D.
Prevention of nutrient absorption
Correct Answer:
Transfer of nutrients to treated tissues
Explanation:
Cytokinins can make treated tissues stronger sinks, causing nutrients to move toward them.
4. A plant tissue treated with cytokinin is likely to receive more:
A.
Mineral nutrients and organic nutrients
B.
Only water vapour
C.
Only oxygen from the air
D.
Less nutrient supply than untreated tissue
Correct Answer:
Mineral nutrients and organic nutrients
Explanation:
Cytokinins promote the mobilization of both mineral nutrients and organic nutrients toward the treated tissue.
5. In nutrient mobilization, cytokinin-treated tissues often act as:
A.
Strong nutrient sinks
B.
Nutrient barriers
C.
Nutrient-free zones
D.
Sources of soil minerals
Correct Answer:
Strong nutrient sinks
Explanation:
Cytokinin-treated tissues attract and accumulate nutrients, so they function as strong nutrient sinks.
6. Which observation best indicates cytokinin-induced nutrient mobilization?
A.
Greater nutrient accumulation near the cytokinin-treated area
B.
Complete loss of nutrients from the plant
C.
No nutrient movement between plant tissues
D.
Nutrients moving only into dead cells
Correct Answer:
Greater nutrient accumulation near the cytokinin-treated area
Explanation:
When cytokinins mobilize nutrients, more nutrients are transported and accumulated around the treated tissue.
7. Cytokinins help developing leaves mainly by increasing the supply of:
A.
Nutrients
B.
Pollen grains
C.
Soil particles
D.
Carbon dioxide bubbles
Correct Answer:
Nutrients
Explanation:
Cytokinins direct nutrients toward developing leaves, supporting their growth and development.
8. What happens to nutrient flow when cytokinin concentration is increased in a particular plant region?
A.
More nutrients may be directed toward that region
B.
All nutrients immediately leave the plant
C.
Nutrient transport stops throughout the plant
D.
Nutrients are changed into water
Correct Answer:
More nutrients may be directed toward that region
Explanation:
A region with increased cytokinin can attract nutrients and become a stronger sink for nutrient transport.
9. Nutrient mobilization by cytokinins is especially useful for supporting:
A.
Growth of young plant tissues
B.
Breakdown of all living tissues
C.
Removal of minerals from leaves
D.
Prevention of cell growth
Correct Answer:
Growth of young plant tissues
Explanation:
Cytokinins mobilize nutrients toward young and actively growing tissues, where nutrients are needed for development.
10. Which statement about cytokinins and nutrient mobilization is correct?
A.
Cytokinins can redirect nutrients toward tissues with high demand
B.
Cytokinins prevent nutrients from reaching growing tissues
C.
Cytokinins destroy all nutrients before transport
D.
Cytokinins transport nutrients only outside the plant
Correct Answer:
Cytokinins can redirect nutrients toward tissues with high demand
Explanation:
Cytokinins help distribute nutrients toward tissues that require them for active growth and development.
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