Q2 of 53 Page 1

Define, ‘trophic level’.

Trophic level are defined as the various steps in a food chain in which there is transfer of food as well as of energy takes place. There are 3-4 trophic levels present in a food chain.


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37

(a) one –half of a convex lens is covered with a black paper. Will such a lens produce an image of the complete object? Support your answer with a ray diagram.

(b) An object 5 cm high is held 25 cm away from a converging lens of focal length 10 cm.


(i) Draw the ray diagram and


(ii) Calculate the position and size of the image formed.


(iii) What is the nature of the image?

 1

Which compound are responsible for the depletion of ozone layer?

 3

Write the electron dot structure of ethene molecule, C2H4.

 4

The atomic numbers of three elements, X, Y and Z are 9, 11 and 17 respectively. Which two of these elements will show similar chemical properties? Why?