1. Which plant hormone can promote fruit development in some plants?
A.
Auxin
B.
Chlorophyll
C.
Starch
D.
Cellulose
Correct Answer:
Auxin
Explanation:
Auxin promotes the growth and development of fruits after flowering.
2. Fruit development without fertilization is called:
A.
Germination
B.
Parthenocarpy
C.
Pollination
D.
Transpiration
Correct Answer:
Parthenocarpy
Explanation:
Parthenocarpy is the development of fruits without fertilization, and auxin can induce this process in some plants.
3. What type of fruits are commonly produced through auxin-induced parthenocarpy?
A.
Seedless fruits
B.
Dried fruits only
C.
Root fruits only
D.
Always poisonous fruits
Correct Answer:
Seedless fruits
Explanation:
Since fertilization does not occur in parthenocarpy, the fruits generally develop without seeds.
4. Application of auxin to a flower after flowering can sometimes cause:
A.
Fruit development without fertilization
B.
Immediate leaf fall
C.
Formation of roots only
D.
Complete stoppage of fruit growth
Correct Answer:
Fruit development without fertilization
Explanation:
Auxin applied to some flowers can stimulate the ovary to develop into a fruit even without fertilization.
5. Which part of a flower may develop into a fruit after auxin treatment?
A.
Ovary
B.
Anther only
C.
Filament only
D.
Pollen grain only
Correct Answer:
Ovary
Explanation:
The ovary normally develops into the fruit, and auxin can stimulate its growth in certain plants.
6. The main agricultural use of auxin in fruit development is to:
A.
Induce fruit formation in some plants
B.
Prevent all seed formation in every plant
C.
Change fruits into roots
D.
Stop the growth of the ovary
Correct Answer:
Induce fruit formation in some plants
Explanation:
Auxins are used to promote fruit formation, including seedless fruit production in suitable crops.
7. A seedless fruit formed without fertilization is an example of:
A.
Parthenocarpic fruit
B.
A germinating seed
C.
A root nodule
D.
A pollen tube
Correct Answer:
Parthenocarpic fruit
Explanation:
A parthenocarpic fruit develops without fertilization and is often seedless.
8. Auxin promotes fruit development mainly by stimulating the growth of the:
A.
Ovary
B.
Pollen grain
C.
Sepal only
D.
Flower stalk only
Correct Answer:
Ovary
Explanation:
Auxin stimulates the ovary to enlarge and develop into a fruit.
9. Which condition is not required for auxin-induced parthenocarpic fruit development?
A.
Fertilization
B.
A suitable flower
C.
Auxin treatment
D.
Growth of the ovary
Correct Answer:
Fertilization
Explanation:
Parthenocarpic fruit development occurs without fertilization, while auxin stimulates the ovary to grow.
10. Why are auxins useful in producing seedless fruits?
A.
They can stimulate fruit growth without fertilization
B.
They directly produce seeds in the fruit
C.
They stop the ovary from developing
D.
They convert seeds into leaves
Correct Answer:
They can stimulate fruit growth without fertilization
Explanation:
Auxins can induce the ovary to develop into a fruit even when fertilization has not occurred, resulting in seedless fruits.
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