1. What is the main function of cotyledons in a dicot embryo?
A.
They protect the root tip
B.
They store or absorb food for the developing embryo
C.
They form the seed coat
D.
They produce pollen grains
Correct Answer:
They store or absorb food for the developing embryo
Explanation:
Cotyledons of a dicot embryo store food or absorb nutrients from the endosperm and provide nourishment to the developing embryo.
2. How many cotyledons are present in a typical dicot embryo?
A.
One
B.
Two
C.
Three
D.
Many
Correct Answer:
Two
Explanation:
A typical dicot embryo has two cotyledons, which is the basis for the term dicotyledon.
3. Which part of a dicot embryo develops into the primary root?
A.
Plumule
B.
Cotyledon
C.
Radicle
D.
Epicotyl
Correct Answer:
Radicle
Explanation:
The radicle is the embryonic root of a dicot embryo and develops into the primary root.
4. Which part of a dicot embryo develops into the shoot system?
A.
Radicle
B.
Plumule
C.
Root cap
D.
Seed coat
Correct Answer:
Plumule
Explanation:
The plumule is the embryonic shoot and develops into the aerial shoot system of the plant.
5. What is the embryonic axis in a dicot embryo?
A.
The seed coat surrounding the embryo
B.
The central part connecting the radicle and plumule
C.
The outer layer of a cotyledon
D.
The stored food inside the seed
Correct Answer:
The central part connecting the radicle and plumule
Explanation:
The embryonic axis is the central axis of the dicot embryo, with the radicle at one end and the plumule at the other.
6. Which structure is located above the cotyledons in a dicot embryo?
A.
Hypocotyl
B.
Radicle
C.
Epicotyl
D.
Root cap
Correct Answer:
Epicotyl
Explanation:
The epicotyl is the portion of the embryonic axis above the cotyledons and bears the plumule.
7. Which structure is located below the cotyledons in a dicot embryo?
A.
Hypocotyl
B.
Plumule
C.
Epicotyl
D.
Cotyledonary node
Correct Answer:
Hypocotyl
Explanation:
The hypocotyl is the portion of the embryonic axis below the cotyledons and extends toward the radicle.
8. In a dicot embryo, the plumule is found at the upper end of the:
A.
Seed coat
B.
Embryonic axis
C.
Radicle
D.
Cotyledon
Correct Answer:
Embryonic axis
Explanation:
The plumule is present at the upper end of the embryonic axis and represents the young shoot.
9. Which part of a dicot embryo bears the two cotyledons?
A.
Embryonic axis
B.
Root cap
C.
Seed coat
D.
Endosperm
Correct Answer:
Embryonic axis
Explanation:
The two cotyledons are attached to the embryonic axis at the cotyledonary node.
10. What is the characteristic shape of a typical dicot embryo?
A.
Heart-shaped
B.
Round and hollow
C.
Spiral-shaped
D.
Star-shaped
Correct Answer:
Heart-shaped
Explanation:
A typical dicot embryo becomes heart-shaped when the two cotyledons begin to develop.
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