Q4 of 70 Page 92

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

Heliophytes are also known as sun loving plants. These plants require high intensity sunlight for optimum growth. Example Thyme, sunflower etc.

Sciophytes are also known as shade loving plants. These plants require low intensity sunlight for optimum growth. Example Lycopodium.


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2

If a freshwater fish is placed in an aquarium containing sea water, will the fish be able to survive? Explain giving reasons.

 3

Why do all the freshwater organisms have contractile vacuoles whereas majority of marine organisms lack them?

 5

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

 6

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.