Q7 of 30 Page 1

Name the two gases contributing maximum to the green house effect.

:Carbon dioxide and Methane are the two gases contributing maximum to the green house effect.


These gases allow the heat waves to reach earth but prevent their escape and the earth becomes warm.


* Greenhouse effect- is a naturally occurring phenomenon that is responsible for heating of earths surface and atmosphere due to presence of certain gases in the atmosphere.


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5

Identify and write the correct statement:

(a) In Grasshopper males two sex chromosomes are X and Y type.


(b) In Grasshopper males there exist XO type of sex-determinants.


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What will happen if DNA replication is not followed by cell division in a eukaryotic cell?

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Write the level of biodiversity represented by a mangrove. Give another example falling in the same level.

 9

‘Fish mortality increases with influx of nutrients in a fresh-water body.’ Write two reasons. How will the influx of nutrients affect the BOD level of this water body?