1. Which plant hormone can help prevent the premature fall of fruits?
A.
Auxin
B.
Ethylene
C.
Abscisic acid
D.
Gibberellin
Correct Answer:
Auxin
Explanation:
Auxin helps prevent premature fruit drop by maintaining the attachment of the fruit to the plant.
2. Application of auxin to fruit plants is useful mainly for preventing what?
A.
Premature fruit drop
B.
Seed germination
C.
Leaf formation
D.
Root absorption
Correct Answer:
Premature fruit drop
Explanation:
Auxin application can reduce the premature falling of fruits from the plant.
3. Which synthetic auxin is commonly used to prevent premature fruit drop?
A.
NAA
B.
Kinetin
C.
Ethylene
D.
Abscisic acid
Correct Answer:
NAA
Explanation:
NAA, or naphthalene acetic acid, is a synthetic auxin that can be used to prevent premature fruit drop.
4. Auxin prevents fruit drop by helping maintain the fruit's connection with which plant part?
A.
Fruit stalk
B.
Root tip
C.
Leaf blade
D.
Pollen grain
Correct Answer:
Fruit stalk
Explanation:
Auxin helps maintain the attachment between the fruit and its stalk, thereby reducing premature fruit drop.
5. A suitable auxin spray on a fruit crop can help fruits remain attached until they are what?
A.
Mature
B.
Germinated
C.
Pollinated
D.
Rooted
Correct Answer:
Mature
Explanation:
Auxin treatment can prevent premature fruit drop and allow fruits to remain attached until maturity.
6. Which treatment is useful for reducing premature fruit drop in some fruit crops?
A.
Spraying a suitable auxin
B.
Removing all roots
C.
Applying only water to flowers
D.
Blocking all sunlight
Correct Answer:
Spraying a suitable auxin
Explanation:
Spraying an appropriate concentration of auxin is an application used to reduce premature fruit drop.
7. The fruit-drop-preventing effect of auxin is especially useful before fruits become what?
A.
Fully mature
B.
Dry seeds
C.
New roots
D.
Pollen grains
Correct Answer:
Fully mature
Explanation:
Auxin is used to prevent fruits from falling before they reach full maturity.
8. Which of the following is an agricultural application of auxin related to fruits?
A.
Preventing premature fruit fall
B.
Increasing soil salinity
C.
Stopping water absorption by roots
D.
Destroying all flowers
Correct Answer:
Preventing premature fruit fall
Explanation:
One agricultural application of auxin is preventing the premature falling of fruits.
9. If fruits fall before ripening, which plant growth regulator may be applied to help reduce the problem?
A.
Auxin
B.
Ethylene
C.
Abscisic acid
D.
Cytokinin
Correct Answer:
Auxin
Explanation:
Auxin treatment can help retain fruits on the plant and reduce their premature fall before ripening.
10. What is the direct benefit of using auxin on a crop prone to early fruit shedding?
A.
Better fruit retention
B.
Immediate seed dormancy
C.
Complete removal of fruits
D.
Prevention of root growth
Correct Answer:
Better fruit retention
Explanation:
Auxin improves fruit retention by helping fruits remain attached to the plant and preventing premature drop.
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