Which of the following is a characteristic feature of asexual reproduction in plants?
Answer: B
Asexual reproduction produces genetically identical clones of the parent plant without involving meiosis or gamete fusion.
Q.302Easy
The number of megaspores produced from a megasporocyte after meiosis is:
Answer: D
Meiosis in a megasporocyte produces four megaspores, though typically only one survives (functional megaspore).
Q.303Easy
Which structure in the flower is responsible for producing pollen grains?
Answer: B
The anther is the male reproductive organ that produces and contains pollen grains.
Q.304Easy
Vegetative reproduction through runners is observed in:
Answer: C
Strawberry reproduces vegetatively through runners (stolons) that develop new plants at nodes.
Q.305Easy
The mature male gametophyte in flowering plants is represented by:
Answer: B
A pollen grain is the mature male gametophyte consisting of two cells: vegetative and generative cell.
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Q.306Medium
Which of the following represents the correct sequence of events in double fertilization?
Answer: A
In double fertilization, one sperm fuses with the egg to form zygote, and the other fuses with two polar nuclei to form primary endosperm nucleus.
Q.307Medium
The embryo sac in flowering plants develops from:
Answer: C
The functional megaspore undergoes mitotic divisions to develop into the embryo sac (female gametophyte).
Q.308Medium
In a typical angiosperm, how many mitotic divisions occur in the male gametophyte after meiosis?
Answer: A
After meiosis produces microspores, one mitotic division produces a two-celled pollen grain (mature male gametophyte).
Q.309Medium
Which of the following is NOT a method of vegetative propagation?
Answer: C
Pollination is part of sexual reproduction, not vegetative propagation. It involves transfer of pollen.
Q.310Medium
The endosperm in angiosperms is:
Answer: C
Endosperm is triploid (3n), formed by fusion of one sperm nucleus (n) with two polar nuclei (2n).
Q.311Medium
Which stage represents the gametophytic phase in the life cycle of angiosperms?
Answer: B
Pollen grain (male gametophyte) and embryo sac (female gametophyte) represent the gametophytic phase in angiosperms.
Q.312Medium
The synergid cells in the embryo sac function to:
Answer: B
Synergids guide the pollen tube towards the egg apparatus and help in pollen tube entry through the filiform apparatus.
Q.313Easy
In potato plants, the vegetative propagule is:
Answer: B
Potato propagates vegetatively through tubers, which are modified stems with nodes capable of producing new plants.
Q.314Medium
Which of the following correctly describes the ploidy level changes during sexual reproduction?
Answer: B
Meiosis reduces ploidy from diploid (2n) to haploid (n), while fertilization restores diploid (2n) condition.
Q.315Medium
The primary endosperm nucleus in angiosperms is formed by:
Answer: B
The primary endosperm nucleus is formed by the fusion of one sperm cell with the two polar nuclei (or secondary nucleus), making it triploid.
Q.316Hard
Which of the following statements about pollen grains is INCORRECT?
Answer: C
Mature pollen grains are bicellular (or sometimes tricellular), not unicellular. They contain vegetative and generative cells.
Q.317Hard
In apomixis, seeds are produced without:
Answer: B
Apomixis is asexual reproduction through seeds, occurring without meiosis and fertilization, producing clones of the parent.
Q.318Hard
The phenomenon where a single plant produces both male and female flowers is called:
Answer: B
Monoecious plants have both male and female flowers on the same plant (e.g., maize, coconut). Dioecious plants have them on different plants.
Q.319Hard
Which stage of meiosis in microsporogenesis ensures genetic variation in pollen grains?
Answer: B
Anaphase I involves separation of homologous chromosomes, which along with crossing over in Prophase I ensures genetic variation in resulting microspores.
Q.320Hard
Identify the correct sequence in the development of male gametophyte:
Answer: B
The correct sequence is: Microsporocyte undergoes meiosis to form microspores, which undergo mitosis to form mature pollen grain (male gametophyte).
