1. Through which opening does the pollen tube usually enter the ovule?
A.
Chalaza
B.
Micropyle
C.
Nucellus
D.
Funicle
Correct Answer:
Micropyle
Explanation:
The pollen tube usually enters the ovule through the micropyle. This mode of entry is called porogamy.
2. The entry of the pollen tube into the ovule through the micropyle is known as:
A.
Porogamy
B.
Chalazogamy
C.
Mesogamy
D.
Apogamy
Correct Answer:
Porogamy
Explanation:
Porogamy is the usual entry of the pollen tube into the ovule through the micropyle.
3. After entering the ovule, the pollen tube usually enters the embryo sac through:
A.
The egg cell
B.
A synergid
C.
The central cell
D.
The antipodal cell
Correct Answer:
A synergid
Explanation:
The pollen tube enters the embryo sac through one of the synergids at the micropylar end.
4. Which structure helps guide the pollen tube during its entry into a synergid?
A.
Filiform apparatus
B.
Endosperm
C.
Seed coat
D.
Funicle
Correct Answer:
Filiform apparatus
Explanation:
The filiform apparatus present in the synergids helps guide the pollen tube into the embryo sac.
5. The pollen tube generally enters the embryo sac at which end?
A.
Chalazal end
B.
Micropylar end
C.
Lateral end
D.
Funicular end
Correct Answer:
Micropylar end
Explanation:
The pollen tube reaches the embryo sac through the micropyle and therefore enters at the micropylar end.
6. The pollen tube usually enters which type of cell before releasing the male gametes?
A.
Antipodal cell
B.
Central cell
C.
Synergid
D.
Egg cell
Correct Answer:
Synergid
Explanation:
The pollen tube enters one synergid, where it releases the two male gametes into the embryo sac.
7. What commonly happens to the synergid through which the pollen tube enters?
A.
It becomes a pollen grain
B.
It degenerates
C.
It forms the seed coat
D.
It develops into an antipodal cell
Correct Answer:
It degenerates
Explanation:
The synergid receiving the pollen tube commonly degenerates, allowing the male gametes to be released.
8. Which part of the ovule is located at the usual entry point of the pollen tube?
A.
Micropyle
B.
Chalaza
C.
Integument base
D.
Funicle tip
Correct Answer:
Micropyle
Explanation:
The micropyle is the small opening in the integuments through which the pollen tube usually enters the ovule.
9. In a typical flowering plant, the pollen tube enters the embryo sac through:
A.
One of the synergids
B.
One of the antipodals
C.
The egg cell directly
D.
The central cell directly
Correct Answer:
One of the synergids
Explanation:
In a typical embryo sac, the pollen tube enters through one of the two synergids at the micropylar end.
10. What is the usual route followed by a pollen tube during entry into the ovule?
A.
Through the chalaza and then an antipodal cell
B.
Through the micropyle and then a synergid
C.
Through the funicle and then the egg cell
D.
Through the integument and then the central cell
Correct Answer:
Through the micropyle and then a synergid
Explanation:
The pollen tube usually enters the ovule through the micropyle and then enters the embryo sac through one synergid.
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