1. What is the embryonic axis in a dicot embryo?
A.
The part between the two cotyledons
B.
The outer covering of the seed
C.
The nutritive tissue of the seed
D.
The entire seed coat
Correct Answer:
The part between the two cotyledons
Explanation:
The embryonic axis is the central part of a dicot embryo located between the two cotyledons.
2. Which structure develops into the root of a plant?
A.
Plumule
B.
Radicle
C.
Epicotyl
D.
Hypocotyl
Correct Answer:
Radicle
Explanation:
The radicle is the lower end of the embryonic axis and develops into the primary root.
3. Which part of the embryonic axis develops into the shoot system?
A.
Radicle
B.
Plumule
C.
Seed coat
D.
Root cap
Correct Answer:
Plumule
Explanation:
The plumule is the upper part of the embryonic axis and develops into the shoot system.
4. The portion of the embryonic axis below the point of attachment of cotyledons is called the:
A.
Epicotyl
B.
Hypocotyl
C.
Plumule
D.
Coleoptile
Correct Answer:
Hypocotyl
Explanation:
The hypocotyl is the part of the embryonic axis located below the cotyledons and above the radicle.
5. The portion of the embryonic axis above the cotyledons is called the:
A.
Hypocotyl
B.
Radicle
C.
Epicotyl
D.
Coleorhiza
Correct Answer:
Epicotyl
Explanation:
The epicotyl is the upper portion of the embryonic axis situated above the cotyledons and ending in the plumule.
6. Which is the correct sequence of parts from the lower end to the upper end of a dicot embryonic axis?
A.
Plumule, epicotyl, cotyledons, hypocotyl, radicle
B.
Radicle, hypocotyl, cotyledons, epicotyl, plumule
C.
Cotyledons, radicle, plumule, hypocotyl, epicotyl
D.
Hypocotyl, radicle, cotyledons, plumule, epicotyl
Correct Answer:
Radicle, hypocotyl, cotyledons, epicotyl, plumule
Explanation:
In a dicot embryo, the radicle is at the lower end, followed by the hypocotyl, cotyledons, epicotyl, and plumule toward the upper end.
7. In a monocot embryo, the embryonic axis is generally:
A.
Long and branched
B.
Short and bears one cotyledon
C.
Absent between the cotyledons
D.
Made only of the radicle
Correct Answer:
Short and bears one cotyledon
Explanation:
The monocot embryonic axis is short and has a single cotyledon, called the scutellum.
8. Which structure protects the plumule in a monocot embryo?
A.
Coleorhiza
B.
Scutellum
C.
Coleoptile
D.
Hypocotyl
Correct Answer:
Coleoptile
Explanation:
The coleoptile is a protective sheath surrounding the plumule in a monocot embryo.
9. Which structure protects the radicle in a monocot embryo?
A.
Coleoptile
B.
Coleorhiza
C.
Epicotyl
D.
Scutellum
Correct Answer:
Coleorhiza
Explanation:
The coleorhiza is the protective sheath surrounding the radicle in a monocot embryo.
10. Which two structures represent the ends of the embryonic axis?
A.
Cotyledon and seed coat
B.
Plumule and radicle
C.
Epicotyl and hypocotyl
D.
Scutellum and endosperm
Correct Answer:
Plumule and radicle
Explanation:
The plumule forms the upper end of the embryonic axis, while the radicle forms its lower end.
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