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Pteridophyta

Genera like S...

Question

Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as:

A

Heterosporous

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B

Homosorus

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C

Heterosorus

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D

Homosporous

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Solution

The correct option is A Heterosporous
Based on the number of types of spores produced, pteridophytes can be classified into the following two types:
1. Homosporous - Most pteridophytes are of this type. They produce all spores of similar kind. Example - Dryopteris
2. Heterosporous - Some genera like Selaginella and Salvinia produce two kinds of spores, macro (large) and micro (small) spores.

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Q. Assertion :Selaginella and Salvinia are homosporous Reason: Similar kind of spores are produced in Selaginella and Salvinia.

Q. Which of the following statement(s) is/are correct about pteridophytes?
(i) The main plant body is a sporophyte which is differentiated into true roots, stem and leaves.
(ii) The leaves are small (microphylls) as in ferns or large (macrophylls) as in Selaginella.
(iii) Genera like Selaginella and Salvinia which produce two kinds of spores–macro (large) and micro (small) spores, are known as heterospores.
(iv) Common examples are Funaria, Polytrichum and Sphagnum.

Q. Read statement

^{'} a

d^{'}

and find out how many is/are incorrect statement(s).
(a) In majority of the pteridophytes, all the spores are of similar kinds.
(b) Genera like Selaginella and Salvinia produce two kind of spore.
(c) The development of the zygote in the young embryos take place within the female gametophytes. This event is a precursor to the seed habit.
(d) Azolla is an aquatic fern that is used as biofertilizer due to the presence of nitrogen fixing cyanobacteria.

Non-motile spores produced by lower plants like algae are termed as-

Q. Plants having vascular tissue, producing spores but lacking seeds are known as:

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