Sample 1Easy
In bryophytes, the main plant body is
- A
the diploid sporophyte
- B
the diploid embryo
- C
the haploid spore
- D
the haploid gametophyte
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The answer is D.The main plant body of a bryophyte is haploid and produces gametes, so it is the gametophyte. The sporophyte is not free-living and stays attached to the gametophyte, from which it gets nourishment.
- A.
The sporophyte is the dominant body in pteridophytes, not bryophytes; in bryophytes it depends on the gametophyte.
- B.
The embryo is only the first stage of the sporophyte.
- C.
A spore is a single reproductive cell, not the plant body.
NCERT: Class 11 Biology, Chapter 3 (Plant Kingdom), Bryophytes
Sample 2Medium
A figure shows a small, upright, leafy green plant fixed to the soil by multicellular, branched rhizoids. From its tip rises a slender stalk ending in a capsule (A) with a lid. Which statement about the figure is correct?
- A
A is part of the gametophyte and produces gametes by mitosis
- B
The leafy plant bearing A is the diploid, free-living sporophyte
- C
The plant is a liverwort, because its rhizoids are branched and multicellular
- D
A is part of the sporophyte; the spores inside it are formed by meiosis
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The answer is D.The plant is a moss. Its leafy stage is the gametophyte, and the sporophyte, made of foot, seta and capsule, grows on it. Spores are formed by meiosis inside the capsule.
- A.
The leafy plant is the gametophyte. The stalk and capsule are the sporophyte, which forms spores, not gametes.
- B.
In mosses the leafy plant is the haploid gametophyte, the dominant stage. The sporophyte is attached to it and depends on it.
- C.
Liverworts have unicellular rhizoids. Multicellular, branched rhizoids are a feature of the leafy stage of mosses.
NCERT: Class 11 Biology, Chapter 3