Practice important
Seed Storage Proteins
MCQ questions and answers.
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10
MCQ Questions
1. What is the main function of seed storage proteins?
A.
To provide nutrients to the developing embryo
B.
To absorb sunlight for photosynthesis
C.
To prevent seed formation
D.
To produce pollen grains
Correct Answer:
To provide nutrients to the developing embryo
Explanation:
Seed storage proteins serve as a reserve of amino acids and nitrogen that support the embryo during germination and early seedling growth.
2. Where are seed storage proteins mainly accumulated?
A.
In mature seeds
B.
In leaf stomata
C.
In flower petals
D.
In root hairs
Correct Answer:
In mature seeds
Explanation:
Seed storage proteins accumulate during seed development and remain stored in mature seeds for use during germination.
3. Which plant hormone promotes the accumulation of seed storage proteins during seed maturation?
A.
Abscisic acid
B.
Ethylene
C.
Auxin
D.
Cytokinin
Correct Answer:
Abscisic acid
Explanation:
Abscisic acid promotes seed maturation and helps activate the production and accumulation of storage proteins in developing seeds.
4. Seed storage proteins are primarily a reserve of which nutrient?
A.
Nitrogen
B.
Oxygen
C.
Sodium chloride
D.
Chlorophyll
Correct Answer:
Nitrogen
Explanation:
Proteins contain nitrogen, so seed storage proteins provide a nitrogen reserve needed for the synthesis of new proteins during seedling growth.
5. When are seed storage proteins mainly synthesized?
A.
During seed development and maturation
B.
Only after the seedling has produced flowers
C.
Only during leaf senescence
D.
After the seed has completely germinated
Correct Answer:
During seed development and maturation
Explanation:
Storage proteins are produced and deposited while the seed is developing so that they are available during later germination.
6. What happens to seed storage proteins during germination?
A.
They are broken down to supply amino acids
B.
They are converted directly into chlorophyll
C.
They are released as pollen
D.
They prevent embryo growth
Correct Answer:
They are broken down to supply amino acids
Explanation:
During germination, enzymes break down storage proteins, releasing amino acids for the growing embryo and young seedling.
7. Why are seed storage proteins important during early seedling growth?
A.
The seedling can use them before it makes enough food by photosynthesis
B.
They replace the seed coat
C.
They produce water for the seed
D.
They stop the formation of roots
Correct Answer:
The seedling can use them before it makes enough food by photosynthesis
Explanation:
Before photosynthesis becomes effective, the developing seedling depends on stored nutrients, including amino acids from storage proteins.
8. Abscisic acid helps developing seeds accumulate storage proteins mainly as part of which process?
A.
Seed maturation
B.
Pollen germination
C.
Leaf expansion
D.
Fruit ripening only
Correct Answer:
Seed maturation
Explanation:
Abscisic acid is an important regulator of seed maturation, including the accumulation of storage proteins that support later germination.
9. Which type of molecule is stored as a seed storage protein?
A.
Amino acid-containing protein
B.
Simple inorganic salt only
C.
Nucleic acid pigment
D.
Cellulose fiber only
Correct Answer:
Amino acid-containing protein
Explanation:
Seed storage proteins are large molecules made of amino acids and act as a stored source of amino acids for the developing seedling.
10. A deficiency of seed storage proteins would most directly affect which stage?
A.
Early growth after germination
B.
Formation of mature pollen only
C.
Opening of leaf stomata only
D.
Production of flower color only
Correct Answer:
Early growth after germination
Explanation:
Reduced storage proteins would limit the amino acid supply available to the embryo and seedling during early growth after germination.
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