1. Which plant hormone is commonly used to produce seedless grapes?
A.
Gibberellin
B.
Ethylene
C.
Abscisic acid
D.
Cytokinin
Correct Answer:
Gibberellin
Explanation:
Gibberellin, especially gibberellic acid, is applied to grape plants to help produce seedless fruits.
2. What is a major effect of gibberellin application in seedless grape production?
A.
Formation of seeds
B.
Development of seedless berries
C.
Premature leaf fall
D.
Complete stoppage of fruit growth
Correct Answer:
Development of seedless berries
Explanation:
Gibberellin treatment promotes the development of seedless grape berries, making it useful in seedless grape production.
3. Gibberellin application is useful in grape cultivation mainly because it can increase the:
A.
Size of grape berries
B.
Number of seeds in each berry
C.
Thickness of the bark
D.
Rate of leaf shedding
Correct Answer:
Size of grape berries
Explanation:
Gibberellin promotes growth of grape berries, often producing larger fruits that are more desirable for cultivation and sale.
4. Which form of gibberellin is widely used for improving seedless grape production?
A.
Gibberellic acid
B.
Indole-3-acetic acid
C.
Abscisic acid
D.
Kinetin
Correct Answer:
Gibberellic acid
Explanation:
Gibberellic acid, commonly called GA3, is the gibberellin preparation widely used in grape cultivation.
5. In seedless grape production, gibberellin is applied to obtain fruits that are generally:
A.
Smaller and harder
B.
Larger and without seeds
C.
More bitter and seeded
D.
Dry and leaf-like
Correct Answer:
Larger and without seeds
Explanation:
Gibberellin treatment helps produce larger grape berries and supports seedless fruit development.
6. The production of seedless grapes with the help of gibberellin is an example of its use in:
A.
Fruit crop improvement
B.
Soil sterilization
C.
Pest killing
D.
Water purification
Correct Answer:
Fruit crop improvement
Explanation:
Using gibberellin to produce larger, seedless grapes is an agricultural application for improving fruit crops.
7. Gibberellin treatment in grapes is especially valued by consumers because seedless grapes are:
A.
Easier to eat
B.
More difficult to harvest
C.
Unable to grow into berries
D.
Always smaller than seeded grapes
Correct Answer:
Easier to eat
Explanation:
Seedless grapes are popular because the absence of seeds makes them more convenient to consume.
8. What happens to grape berries after suitable gibberellin treatment?
A.
Their growth is promoted
B.
Their growth stops completely
C.
They immediately become roots
D.
They lose all water before ripening
Correct Answer:
Their growth is promoted
Explanation:
Gibberellin promotes the growth and enlargement of grape berries, which is an important purpose of its application.
9. Gibberellin is used in seedless grape production primarily to improve the:
A.
Fruit quality and market value
B.
Seed production of grapes
C.
Thorn formation on grape vines
D.
Decay of mature berries
Correct Answer:
Fruit quality and market value
Explanation:
Larger, seedless grapes are generally more desirable in the market, so gibberellin treatment can improve their commercial value.
10. Which statement about gibberellin-treated seedless grapes is correct?
A.
Gibberellin can help produce larger seedless berries
B.
Gibberellin always increases the number of seeds
C.
Gibberellin prevents grape berries from growing
D.
Gibberellin is used only to dry grape leaves
Correct Answer:
Gibberellin can help produce larger seedless berries
Explanation:
A key application of gibberellin in grapes is the production of larger berries without seeds.
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