1. What are the two main parts of a mature dicot embryo?
A.
Cotyledons and embryonic axis
B.
Endosperm and seed coat
C.
Plumule and testa
D.
Radicle and pericarp
Correct Answer:
Cotyledons and embryonic axis
Explanation:
A mature dicot embryo consists mainly of two cotyledons attached to an embryonic axis.
2. The embryonic axis of a mature dicot embryo has which structure at its upper end?
A.
Radicle
B.
Plumule
C.
Scutellum
D.
Coleorhiza
Correct Answer:
Plumule
Explanation:
The plumule is the upper end of the embryonic axis and develops into the shoot.
3. Which structure is present at the lower end of the embryonic axis in a mature embryo?
A.
Plumule
B.
Scutellum
C.
Radicle
D.
Coleoptile
Correct Answer:
Radicle
Explanation:
The radicle is located at the lower end of the embryonic axis and forms the primary root.
4. What is the single large cotyledon of a mature grass embryo called?
A.
Scutellum
B.
Coleoptile
C.
Coleorhiza
D.
Plumule
Correct Answer:
Scutellum
Explanation:
In a mature monocot embryo such as maize, the single cotyledon is called the scutellum.
5. In a mature monocot embryo, the plumule is enclosed by which protective sheath?
A.
Coleorhiza
B.
Scutellum
C.
Coleoptile
D.
Testa
Correct Answer:
Coleoptile
Explanation:
The coleoptile is a protective sheath surrounding the plumule in a mature monocot embryo.
6. Which structure protects the radicle in a mature monocot embryo?
A.
Coleoptile
B.
Coleorhiza
C.
Scutellum
D.
Endosperm
Correct Answer:
Coleorhiza
Explanation:
The coleorhiza is the protective sheath surrounding the radicle in a mature monocot embryo.
7. How many cotyledons are usually present in a mature dicot embryo?
A.
One
B.
Two
C.
Three
D.
Many
Correct Answer:
Two
Explanation:
A mature dicot embryo characteristically has two cotyledons.
8. How many cotyledons are present in a mature monocot embryo?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
One
Explanation:
A mature monocot embryo has a single cotyledon, known as the scutellum in grasses.
9. The part of the embryonic axis between the cotyledons and the radicle is called the:
A.
Epicotyl
B.
Hypocotyl
C.
Coleoptile
D.
Scutellum
Correct Answer:
Hypocotyl
Explanation:
The hypocotyl is the portion of the embryonic axis below the cotyledons and above the radicle.
10. The part 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 portion of the embryonic axis above the cotyledons and includes the plumule.
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