1. What is a major role of abscisic acid during embryo maturation?
A.
Promoting embryo maturation
B.
Breaking down the embryo
C.
Preventing seed formation
D.
Stopping cell differentiation permanently
Correct Answer:
Promoting embryo maturation
Explanation:
Abscisic acid promotes the proper maturation and development of the embryo inside the developing seed.
2. Abscisic acid helps a developing embryo accumulate which type of substances?
A.
Storage proteins
B.
Digestive enzymes only
C.
Pollens
D.
Leaf pigments
Correct Answer:
Storage proteins
Explanation:
During embryo maturation, abscisic acid promotes the accumulation of storage proteins that support the young plant after germination.
3. Which protective ability is promoted by abscisic acid during embryo maturation?
A.
Desiccation tolerance
B.
Permanent water absorption
C.
Rapid leaf expansion
D.
Root hair shedding
Correct Answer:
Desiccation tolerance
Explanation:
Abscisic acid helps the maturing embryo tolerate drying as the seed loses water during maturation.
4. The accumulation of storage reserves in a maturing embryo mainly prepares the seed for what process?
A.
Early growth after germination
B.
Immediate fruit ripening
C.
Formation of new flowers
D.
Permanent inhibition of growth
Correct Answer:
Early growth after germination
Explanation:
Storage reserves formed during embryo maturation provide nutrients for the seedling during its early growth after germination.
5. Which hormone is especially important in regulating embryo maturation in developing seeds?
A.
Abscisic acid
B.
Auxin only
C.
Ethylene only
D.
Cytokinin only
Correct Answer:
Abscisic acid
Explanation:
Abscisic acid is a key hormone that regulates embryo maturation, including storage reserve accumulation and preparation for drying.
6. During embryo maturation, abscisic acid helps prevent the embryo from doing what too early?
A.
Germinating
B.
Forming storage proteins
C.
Becoming desiccation tolerant
D.
Completing development
Correct Answer:
Germinating
Explanation:
Abscisic acid prevents premature germination while the embryo is still developing and accumulating reserves.
7. What happens to the water content of a seed during the later stages of embryo maturation?
A.
It generally decreases
B.
It increases without limit
C.
It remains permanently at a maximum level
D.
It changes into storage protein
Correct Answer:
It generally decreases
Explanation:
Mature seeds usually undergo drying, and abscisic acid helps the embryo develop tolerance to this reduced water content.
8. Which feature of a mature embryo is supported by abscisic acid?
A.
Ability to survive drying
B.
Ability to produce flowers immediately
C.
Ability to absorb unlimited water
D.
Ability to avoid forming reserves
Correct Answer:
Ability to survive drying
Explanation:
Abscisic acid promotes desiccation tolerance, allowing the mature embryo to survive the drying phase of seed development.
9. Abscisic acid promotes the expression of genes involved in the production of what during embryo maturation?
A.
Seed storage proteins
B.
Leaf-cutting enzymes
C.
Flower pigments only
D.
Root-shoot separation proteins
Correct Answer:
Seed storage proteins
Explanation:
Abscisic acid activates processes and genes that help the embryo accumulate seed storage proteins during maturation.
10. Why is abscisic acid important for a developing embryo before the seed becomes mature?
A.
It coordinates maturation and protects the embryo from drying
B.
It causes the embryo to germinate inside the fruit
C.
It removes all food reserves from the seed
D.
It prevents the embryo from completing development
Correct Answer:
It coordinates maturation and protects the embryo from drying
Explanation:
Abscisic acid coordinates embryo maturation, promotes reserve accumulation, and helps the embryo tolerate the drying associated with mature seed formation.
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