biology : class12 Embryo Development Stages : Dicot Embryo, Monocot Embryo, Embryonic Axis, Cotyledons : Embryo Development MCQ Questions and Answers
Practice important
Embryo Development Stages
MCQ questions and answers.
Page 1
of
1
|
10
MCQ Questions
1. What is the first division of a typical dicot zygote during embryo development?
A.
Transverse division
B.
Longitudinal division
C.
Diagonal division
D.
Unequal radial division
Correct Answer:
Transverse division
Explanation:
The zygote usually divides transversely to form a terminal cell and a basal cell, marking the beginning of embryo development.
2. Which cell of the divided zygote generally gives rise to most of the embryo proper?
A.
Terminal cell
B.
Basal cell
C.
Suspensor cell only
D.
Endosperm cell
Correct Answer:
Terminal cell
Explanation:
The terminal cell undergoes repeated divisions and forms most of the embryo proper, while the basal cell mainly contributes to the suspensor.
3. What is the main function of the suspensor during early embryo development?
A.
Push the embryo into the endosperm
B.
Produce pollen grains
C.
Form the seed coat
D.
Store starch in the cotyledons
Correct Answer:
Push the embryo into the endosperm
Explanation:
The suspensor helps push the developing embryo into the nutritive endosperm and supports the early stages of embryo development.
4. Which embryo shape appears after the early spherical stage in a typical dicot embryo?
A.
Heart-shaped
B.
Star-shaped
C.
Cylindrical only
D.
Circular ring-shaped
Correct Answer:
Heart-shaped
Explanation:
The heart-shaped stage develops when the two cotyledonary primordia become visible on the young embryo.
5. The heart-shaped stage of a dicot embryo mainly indicates the beginning of formation of which structures?
A.
Cotyledons
B.
Root hairs
C.
Pollen sacs
D.
Seed coat layers
Correct Answer:
Cotyledons
Explanation:
The heart-shaped appearance is produced by the emergence and growth of the two cotyledonary primordia.
6. Which stage generally follows the heart-shaped stage in dicot embryo development?
A.
Torpedo-shaped stage
B.
Zygote stage
C.
Pollen grain stage
D.
Endosperm-free stage
Correct Answer:
Torpedo-shaped stage
Explanation:
After the heart-shaped stage, the embryo elongates and commonly assumes a torpedo-shaped form.
7. During the torpedo stage, which part of the dicot embryo becomes more elongated?
A.
Embryonic axis
B.
Seed coat
C.
Endosperm wall
D.
Pollen tube
Correct Answer:
Embryonic axis
Explanation:
The embryonic axis elongates during the torpedo stage, while the cotyledons also become more distinct.
8. What is the usual sequence of major stages in dicot embryo development?