Q6 of 70 Page 92

In a seashore, the benthic animals live in sandy, muddy and rocky substrata and accordingly developed the following adaptations.

a. Burrowing


b. Building cubes


c. Holdfasts / peduncle


Find the suitable substratum against each adaptation.


Benthic animals are those which live near the sea bed ,river, lake or bottom of the stream .


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4

Define heliophytes and sciophytes. Name a plant from your locality that is either heliophyte or sciophyte.

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Why do submerged plants receive weaker illumination than exposed floating plants in a lake?

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Categorise the following plants into hydrophytes, halophytes, mesophytes and xerophytes. Give reasons for your answers.

a. Salvinia


b. Opuntia


c. Rhizophora


d. Mangifera


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In a pond, we see plants which are free-floating; rooted–submerged; rooted emergent; rooted with floating leaves. Write the type of plants against each of them.