1. What is the main effect of cytokinins on lateral buds?
A.
They promote the growth of lateral buds
B.
They stop the growth of lateral buds
C.
They convert lateral buds into roots
D.
They destroy lateral buds
Correct Answer:
They promote the growth of lateral buds
Explanation:
Cytokinins stimulate the growth and development of lateral buds, helping branches form from the sides of a stem.
2. Application of cytokinin to a plant shoot generally causes which result?
A.
Increased growth of lateral branches
B.
Complete loss of leaves
C.
Suppression of all root growth
D.
Formation of flowers only
Correct Answer:
Increased growth of lateral branches
Explanation:
Cytokinins encourage lateral bud growth, which can lead to the development of more lateral branches.
3. Cytokinins help overcome which condition by promoting lateral bud growth?
A.
Apical dominance
B.
Seed dormancy
C.
Leaf senescence
D.
Root cap formation
Correct Answer:
Apical dominance
Explanation:
Cytokinins promote lateral bud growth and therefore help reduce the inhibitory effect of the shoot apex known as apical dominance.
4. A plant treated with cytokinin is likely to develop more:
A.
Side shoots
B.
Root hairs only
C.
Seed coats
D.
Pollen grains only
Correct Answer:
Side shoots
Explanation:
Growth of lateral buds produces side shoots, so cytokinin treatment can increase branching.
5. Which plant structure is directly stimulated by cytokinins to produce branches?
A.
Lateral bud
B.
Root cap
C.
Seed coat
D.
Leaf vein
Correct Answer:
Lateral bud
Explanation:
Lateral buds are buds present on the sides of stems, and cytokinins stimulate their growth into branches.
6. In a plant showing strong apical dominance, cytokinin treatment would most likely:
A.
Stimulate the growth of lateral buds
B.
Stop the main shoot from absorbing water
C.
Prevent all cell division
D.
Remove the plant's leaves immediately
Correct Answer:
Stimulate the growth of lateral buds
Explanation:
Cytokinins can reduce the effect of apical dominance by activating lateral buds and encouraging their growth.
7. Which growth pattern is commonly associated with increased cytokinin activity in shoots?
A.
More branching
B.
No branching at all
C.
Only downward stem growth
D.
Complete stoppage of bud development
Correct Answer:
More branching
Explanation:
Greater cytokinin activity promotes the development of lateral buds, resulting in increased branching.
8. Why may cytokinins be used to make a plant bushier?
A.
They promote lateral bud growth
B.
They remove all shoot buds
C.
They prevent stem cell division
D.
They stop the formation of branches
Correct Answer:
They promote lateral bud growth
Explanation:
A bushier plant develops when more lateral buds grow into side branches, and cytokinins support this process.
9. If lateral buds remain inactive, which plant hormone can help stimulate their growth?
A.
Cytokinin
B.
Ethylene only
C.
Abscisic acid only
D.
Gibberellin only
Correct Answer:
Cytokinin
Explanation:
Cytokinin is the hormone associated with stimulating lateral bud growth and promoting branching.
10. What is the expected effect of applying cytokinin near a dormant lateral bud?
A.
The bud may begin to grow
B.
The bud will always become a root
C.
The bud will lose its cells
D.
The bud will turn into a seed
Correct Answer:
The bud may begin to grow
Explanation:
Cytokinin can activate dormant lateral buds, allowing them to grow and form new side shoots.
Short questions are currently unavailable for this page.