1. How many male gametes are released by the pollen tube in a typical angiosperm?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
Two
Explanation:
The pollen tube carries and releases two male gametes into the embryo sac.
2. Where does the pollen tube release the male gametes?
A.
Inside a synergid
B.
Inside the egg cell
C.
Inside the central cell only
D.
Outside the ovule
Correct Answer:
Inside a synergid
Explanation:
The pollen tube enters one of the synergids and releases the two male gametes there.
3. The male gametes are released from the pollen tube when its tip:
A.
Becomes hard
B.
Bursts
C.
Forms a seed coat
D.
Develops into an ovule
Correct Answer:
Bursts
Explanation:
The tip of the pollen tube bursts after entering the synergid, releasing the male gametes.
4. Which structure carries the male gametes toward the embryo sac?
A.
Pollen tube
B.
Seed coat
C.
Endosperm
D.
Ovary wall
Correct Answer:
Pollen tube
Explanation:
The pollen tube grows through the pistil and transports the two male gametes to the embryo sac.
5. The two male gametes released by a pollen tube are generally:
A.
Haploid
B.
Diploid
C.
Triploid
D.
Tetraploid
Correct Answer:
Haploid
Explanation:
Male gametes are haploid cells and are released from the pollen tube into the embryo sac.
6. Which cell usually receives the pollen tube before male gamete release?
A.
Synergid
B.
Egg cell
C.
Antipodal cell
D.
Integument cell
Correct Answer:
Synergid
Explanation:
The pollen tube enters one synergid, where it releases the two male gametes.
7. What is the immediate result of pollen tube rupture inside the embryo sac?
A.
Release of two male gametes
B.
Formation of the seed coat
C.
Development of the ovary wall
D.
Formation of pollen grains
Correct Answer:
Release of two male gametes
Explanation:
Pollen tube rupture allows the two male gametes to enter the embryo sac.
8. The male gametes are transported through the pollen tube from the:
A.
Pollen grain
B.
Seed coat
C.
Ovary wall
D.
Endosperm
Correct Answer:
Pollen grain
Explanation:
The male gametes originate in the pollen grain and are carried through the growing pollen tube.
9. In flowering plants, male gamete release takes place in the:
A.
Embryo sac
B.
Anther wall
C.
Filament
D.
Stigma surface
Correct Answer:
Embryo sac
Explanation:
The pollen tube reaches the embryo sac and releases the male gametes inside it.
10. What does the pollen tube deliver into the embryo sac?
A.
Two male gametes
B.
Two egg cells
C.
Two synergids
D.
Two seed coats
Correct Answer:
Two male gametes
Explanation:
The main function of the pollen tube at this stage is to deliver two male gametes into the embryo sac.
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