Q81
Diversification in plant life appeared
Correct Answer
Option A
Solution
Diversification in plant life appeared due to long periods of evolutionary changes, from algae to bryophytes to pteridophytes to gymnosperms to angiosperms.
Plant Kingdom
Q82
Angiosperms have dominated the land flora primarily because of their
Correct Answer
Option A
Solution
Angiosperms have adapted themselves to all kinds of habitats - terrestrial, aquatic, tropical, deciduous and alpine.
Q83
Which one pair of examples will correctly represent the grouping Spermatophyta?
Correct Answer
Option D
Solution
Spermatophyta includes seed bearing plants (gymnosperms and angiosperms).
Ginkgo is gymnosperm and Pisum is angiosperm, so they represent both groups.
Q84
Which one of the following pairs of plants are not seed producers?
Correct Answer
Option A
Solution
Pteridophytes (fern) and bryophytes (Funaria) are seedless plants. Both are cryptogams.
Q85
Plants reproducing by spores such as mosses and ferns are grouped under the general term
Correct Answer
Option A
Solution
Plants which reproduce by spores and do not produce seeds are called cryptogams (Kryptos = hidden + gamos = marriage).
Q86
Sexual reproduction in Spirogyra is an advanced feature because it shows
Correct Answer
Option D
Solution
In Spirogyra, gametes are morphologically similar but physiologically dissimilar (isogamy with physiological anisogamy).
Q87
Which of the following plants produces seeds but not flowers?
Correct Answer
Option D
Solution
Pinus is a gymnosperm - it produces seeds but not flowers. Maize, mint and peepal are angiosperms.
Q88
Which of the following is without exception in angiosperms?
Correct Answer
Option B
Solution
Double fertilization is characteristic of all angiosperms without exception.
Some angiosperms lack vessels, secondary growth, or are heterotrophic.
Q89
Cycas has two cotyledons but not included in angiosperms because of
Correct Answer
Option A
Solution
Cycas belongs to gymnosperms because it has naked seeds not enclosed inside a fruit. It also lacks double fertilization.
Q90
Plant group with largest ovule, largest tree, and largest gametes is
Correct Answer
Option A
Solution
In gymnosperms: Sequoia sempervirens is among the tallest trees.
Cycas has the largest ovule and largest male gametes (300 micrometers, visible to naked eye).
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