1. Triple fusion in flowering plants involves the fusion of one male gamete with which structures?
A.
Two polar nuclei
B.
Two egg cells
C.
One egg cell and one synergid
D.
Two antipodal cells
Correct Answer:
Two polar nuclei
Explanation:
Triple fusion occurs when one male gamete fuses with the two polar nuclei present in the central cell.
2. What is formed as a result of triple fusion?
A.
Zygote
B.
Primary endosperm nucleus
C.
Pollen grain
D.
Embryo
Correct Answer:
Primary endosperm nucleus
Explanation:
The fusion of one male gamete with two polar nuclei forms the primary endosperm nucleus.
3. The primary endosperm nucleus formed after triple fusion is generally:
A.
Haploid
B.
Diploid
C.
Triploid
D.
Tetraploid
Correct Answer:
Triploid
Explanation:
The primary endosperm nucleus contains one haploid male nucleus and two haploid polar nuclei, making it triploid.
4. Triple fusion takes place in the:
A.
Egg cell
B.
Central cell
C.
Synergid
D.
Pollen grain
Correct Answer:
Central cell
Explanation:
The two polar nuclei are located in the central cell, where they fuse with one male gamete during triple fusion.
5. How many nuclei participate directly in triple fusion?
A.
Two
B.
Three
C.
Four
D.
Five
Correct Answer:
Three
Explanation:
Triple fusion involves three nuclei: one male gamete nucleus and two polar nuclei.
6. Which male gamete participates in triple fusion?
A.
The first male gamete
B.
The second male gamete
C.
Both male gametes together
D.
A male gamete from another pollen grain
Correct Answer:
The second male gamete
Explanation:
In double fertilisation, the second male gamete fuses with the two polar nuclei to bring about triple fusion.
7. The endosperm develops from the product of:
A.
Syngamy
B.
Triple fusion
C.
Pollen germination
D.
Fusion of two egg cells
Correct Answer:
Triple fusion
Explanation:
Triple fusion produces the primary endosperm nucleus, which develops into the endosperm.
8. If each polar nucleus is haploid, the nucleus formed by triple fusion has what chromosome condition?
A.
n
B.
2n
C.
3n
D.
4n
Correct Answer:
3n
Explanation:
One haploid male nucleus fuses with two haploid polar nuclei, resulting in a triploid, or 3n, primary endosperm nucleus.
9. Triple fusion is called so because:
A.
Three pollen tubes fuse
B.
Three nuclei fuse together
C.
Three egg cells fuse
D.
Three ovules fuse
Correct Answer:
Three nuclei fuse together
Explanation:
The term triple fusion refers to the fusion of one male nucleus with two polar nuclei.
10. Which structure receives the product of triple fusion and later forms the nutritive tissue of the seed?
A.
Endosperm
B.
Seed coat
C.
Embryo
D.
Cotyledon
Correct Answer:
Endosperm
Explanation:
The primary endosperm nucleus formed by triple fusion develops into the endosperm, which nourishes the developing embryo.
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