1.
Giving
examples
,
differentiate
between
the
following
:
(
ii
)
Simple
leaf
and
costs
Long Answer Quest
2
3.
(i) Tap root and fibrous root.
(ii) Parallel venation and reticulate venation.
What is the modification seen in Bryophyllum ? Explain.
What purpose is served by the spines borne on the leaves of cactus
4. Explain why leaf survival is so important to the plant ?
Give an example of the following and draw generalized diagrams for th
(i) Simple leaf and compound leaf.
(ii) Parallel venation and reticulate venation.
Answers
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Answer:
BASIS FOR COMPARISON TAP ROOT FIBROUS (ADVENTITIOUS) ROOT
Meaning Such roots which develop into primary root arising from radicle (embryonic root), these become the main root of the plant,with secondary, tertiary and other lateral branches. Such roots that arise from other parts of the plants like stems, or leaves other than roots are called fibrous or adventitious root.
Develops from It develops from the radicle of the embryo. It develops from the stem, leaves or places other than radicle.
Features of root Consist of a persistent primary root. Consist of the short-lived root.
These are deep-rooted. Usually shallow.
Always underground. Can be either underground or aerial.
Taproot consists of only one long and main root. Multiple root systems.
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