1. Which embryonic stage follows the heart-shaped stage during dicot embryo development?
A.
Torpedo-shaped stage
B.
Globular stage
C.
Mature seed stage
D.
Pollen stage
Correct Answer:
Torpedo-shaped stage
Explanation:
The torpedo-shaped stage develops after the heart-shaped stage as the embryo elongates.
2. Why is the embryo called torpedo-shaped at this stage?
A.
It becomes elongated with pointed ends
B.
It becomes completely spherical
C.
It loses all embryonic parts
D.
It develops a thick seed coat
Correct Answer:
It becomes elongated with pointed ends
Explanation:
The embryo is called torpedo-shaped because its body becomes elongated and resembles a torpedo.
3. Which structures are clearly visible in a dicot embryo at the torpedo-shaped stage?
A.
Cotyledons and embryonic axis
B.
Anthers and filaments
C.
Sepals and petals
D.
Root hairs and lateral roots
Correct Answer:
Cotyledons and embryonic axis
Explanation:
At the torpedo-shaped stage, the developing cotyledons and embryonic axis are clearly distinguishable.
4. What happens to the embryonic axis during the torpedo-shaped stage?
A.
It elongates between the cotyledons
B.
It disappears completely
C.
It changes into a flower
D.
It becomes a seed coat
Correct Answer:
It elongates between the cotyledons
Explanation:
The embryonic axis elongates during the torpedo-shaped stage and lies between the developing cotyledons.
5. The torpedo-shaped embryo develops from which earlier embryo form?
A.
Heart-shaped embryo
B.
Pollen grain
C.
Endosperm cell
D.
Mature leaf
Correct Answer:
Heart-shaped embryo
Explanation:
In dicot embryogenesis, the heart-shaped embryo develops further into the torpedo-shaped embryo.
6. At the torpedo-shaped stage, the two cotyledons are generally positioned on which part of the embryo?
A.
On either side of the embryonic axis
B.
Inside the seed coat only
C.
At the tip of the root hair
D.
Around the pollen tube
Correct Answer:
On either side of the embryonic axis
Explanation:
The cotyledons develop on opposite sides of the embryonic axis, giving the embryo its characteristic form.
7. Which change gives the dicot embryo its torpedo-like appearance?
A.
Elongation of the embryonic axis
B.
Formation of floral organs
C.
Disappearance of cotyledons
D.
Development of fruit wall
Correct Answer:
Elongation of the embryonic axis
Explanation:
Elongation of the embryonic axis, along with developing cotyledons, produces the torpedo-like shape.
8. Which pair represents the main visible regions of a torpedo-shaped dicot embryo?
A.
Cotyledons and embryonic axis
B.
Stamens and carpels
C.
Petals and sepals
D.
Pollen grains and ovules
Correct Answer:
Cotyledons and embryonic axis
Explanation:
The torpedo-shaped embryo is characterized by its developing cotyledons and elongated embryonic axis.
9. The torpedo-shaped stage is a stage of development of which structure?
A.
The plant embryo
B.
The pollen grain
C.
The fruit wall
D.
The mature flower
Correct Answer:
The plant embryo
Explanation:
The torpedo-shaped stage is one of the recognizable stages in the development of a plant embryo.
10. Which statement about a torpedo-shaped dicot embryo is correct?
A.
It has an elongated axis and developing cotyledons
B.
It is completely spherical and lacks cotyledons
C.
It consists only of a seed coat
D.
It contains only floral organs
Correct Answer:
It has an elongated axis and developing cotyledons
Explanation:
A torpedo-shaped dicot embryo has an elongated embryonic axis with developing cotyledons.
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