Q4 of 18 Page 146

What special adaptations can be seen in the following organisms? (AS1)

a) Mangrove trees


b) Camel


c) Fish


d) Dolphins


e) Planktons

a) Mangrove trees – pneumatophores or knees, the lateral outgrowth of roots, for breathing


b) Camel – hump (fat storage), long eyelashes (protects from sand), long legs (keeps the body away from hot sand), nostrils (voluntary breathing for protection from sand).


c) Fish – fins for swimming.


d) Dolphins – floaters (special structures in the digestive canals) to enable them to inhabit certain levels in the water.


e) Planktons – droplets of oil in the cells to keep them afloat.


More from this chapter

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2

With the help of two examples, explain how these organisms have adapted themselves in the ecosystem? (AS1)

 3

Collect some aquatic plants- cut the leaves and stems Observe them under microscope and record your observations like air presence /absence of air spaces etc. and answer the below. (AS 3)

a) Why do they float on water?


b) What make them float?


c) Are there any other reasons for their floating?


d) Draw a diagram of what you have observed under microscope?

 5

If an animal of euphotic zone has to survive in abyssal zone, what adaptations are required to survive there? (AS1)

 6

Marine water fishes drink more water than fresh water fishes. Do you agree? Justify.