biology : class11 Fruit thinning : Functions, Effects, Applications : Auxin MCQ Questions and Answers
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Fruit thinning
MCQ questions and answers.
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MCQ Questions
1. What is the main purpose of fruit thinning using auxins?
A.
To reduce the number of developing fruits
B.
To increase the number of leaves
C.
To prevent seed formation in all fruits
D.
To increase the height of the plant
Correct Answer:
To reduce the number of developing fruits
Explanation:
Auxins can be applied to young fruit trees to cause the shedding of some developing fruits, thereby reducing the total fruit number.
2. Which synthetic auxin is commonly used for fruit thinning?
A.
Naphthalene acetic acid
B.
Gibberellic acid
C.
Abscisic acid
D.
Ethylene
Correct Answer:
Naphthalene acetic acid
Explanation:
Naphthalene acetic acid, or NAA, is a synthetic auxin commonly used in suitable concentrations for thinning young fruits.
3. Fruit thinning with auxins is generally carried out when the fruits are:
A.
Young and developing
B.
Fully ripe
C.
Already dried
D.
Stored after harvesting
Correct Answer:
Young and developing
Explanation:
Auxin sprays for fruit thinning are usually applied during the early stage of fruit development, when young fruits can be shed.
4. What happens to some young fruits after an appropriate auxin treatment for thinning?
A.
They abscise and fall from the plant
B.
They all become seeds immediately
C.
They change into leaves
D.
They become roots
Correct Answer:
They abscise and fall from the plant
Explanation:
Fruit thinning occurs because auxin treatment can promote the abscission, or falling, of some young developing fruits.
5. Why is fruit thinning useful in fruit cultivation?
A.
It reduces overcrowding among developing fruits
B.
It stops all fruit development
C.
It prevents the formation of flowers
D.
It removes all mature fruits before harvest
Correct Answer:
It reduces overcrowding among developing fruits
Explanation:
Thinning reduces the number of fruits competing for nutrients, helping the remaining fruits develop with less overcrowding.
6. Which type of substance is used in chemical fruit thinning?
A.
A suitable concentration of an auxin
B.
A protein-digesting enzyme
C.
A mineral salt only
D.
A carbohydrate solution only
Correct Answer:
A suitable concentration of an auxin
Explanation:
Chemical fruit thinning is performed by applying an auxin, such as NAA, at a concentration suitable for causing the shedding of some young fruits.
7. What is the expected result of successful fruit thinning in an orchard?
A.
Fewer fruits remain on each plant
B.
Every flower becomes a fruit
C.
All fruits are removed from the plant
D.
The plant stops producing leaves
Correct Answer:
Fewer fruits remain on each plant
Explanation:
The purpose of thinning is to remove some developing fruits so that a smaller number remains on the plant.
8. The effectiveness of an auxin spray for fruit thinning mainly depends on using the correct:
A.
Concentration and time of application
B.
Leaf color and plant height
C.
Seed size and root length
D.
Fruit taste and flower color
Correct Answer:
Concentration and time of application
Explanation:
Fruit thinning with auxins depends strongly on applying the appropriate concentration at the proper stage of young fruit development.
9. Fruit thinning by auxins can help reduce competition among fruits for:
A.
Nutrients
B.
Pollen grains only
C.
Sunlight in stored fruits
D.
Seed coats after harvesting
Correct Answer:
Nutrients
Explanation:
When some fruits are removed, the remaining fruits face less competition for nutrients needed for their development.
10. Which statement correctly describes auxin use in fruit thinning?
A.
Auxin treatment can cause some young fruits to drop
B.
Auxin treatment always increases the number of fruits
C.
Auxin treatment changes fruits into flowers
D.
Auxin treatment is used only after fruits are harvested
Correct Answer:
Auxin treatment can cause some young fruits to drop
Explanation:
At suitable conditions, auxin application during early fruit development causes some young fruits to abscise, producing fruit thinning.
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