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100 questions in this collection · Page 2 of 10
Question 11 of 100
📘 CLASS XI
Plant Kingdom
Why are bryophytes referred to as "amphibians of the plant kingdom"?
Bryophytes are called amphibians of the plant kingdom because these plants can live in soil but are dependent on water for sexual reproduction.
Question 12 of 100
📘 CLASS XI
Plant Kingdom
In bryophytes, the sporophyte:
The sporophyte in bryophytes is not free-living but remains attached to the photosynthetic gametophyte and derives nourishment from it.
Question 13 of 100
📘 CLASS XI
Plant Kingdom
Which of the following is an ecological importance of mosses?
Mosses, along with lichens, are the first organisms to colonise rocks and hence are of great ecological importance, making the substrate suitable for higher plants.
Question 14 of 100
📘 CLASS XI
Plant Kingdom
Asexual reproduction in liverworts can take place by the formation of specialized structures called:
Asexual reproduction in liverworts takes place by fragmentation of thalli, or by the formation of specialized structures called gemmae, which are green, multicellular, asexual buds.
Question 15 of 100
📘 CLASS XI
Plant Kingdom
The predominant stage of the life cycle of a moss consists of:
The predominant stage of the life cycle of a moss is the gametophyte, which consists of two stages: the creeping protonema stage and the upright leafy stage.
Question 16 of 100
📘 CLASS XI
Plant Kingdom
Evolutionarily, which of the following groups was the first to possess vascular tissues (xylem and phloem)?
Pteridophytes, which include horsetails and ferns, are evolutionarily the first terrestrial plants to possess vascular tissues—xylem and phloem.
Question 17 of 100
📘 CLASS XI
Plant Kingdom
In pteridophytes, the dominant plant body is a ________, which is differentiated into true roots, stems, and leaves.
Unlike bryophytes, in pteridophytes, the main plant body is a sporophyte which is differentiated into true roots, stems, and leaves.
Question 18 of 100
📘 CLASS XI
Plant Kingdom
The inconspicuous, multicellular, free-living photosynthetic gametophyte of pteridophytes is called a:
In pteridophytes, the spores germinate to give rise to inconspicuous, small but multicellular, free-living, mostly photosynthetic thalloid gametophytes called a prothallus.
Question 19 of 100
📘 CLASS XI
Plant Kingdom
Which of the following genera of pteridophytes are known to be heterosporous?
Genera like Selaginella and Salvinia, which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous.
Question 20 of 100
📘 CLASS XI
Plant Kingdom
The retention of female gametophytes on parent sporophytes for variable periods in certain pteridophytes is a precursor to:
In heterosporous plants, the development of zygotes into young embryos takes place within the female gametophytes retained on the parent sporophytes. This event is a precursor to the seed habit, an important step in evolution.