Q34 of 55 Page 1

How will you distinguish between a concave mirror and convex mirror in the Laboratory?

A concave mirror and a convex mirror can be differentiated by following ways in the laboratory:


Convex mirror forms an erect image but concave mirrors forms erect image as well as inverted image. Convex mirror forms only erect image. Moreover, the image formed by the concave mirror will be magnified in size and image formed by the convex mirror is diminished.


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32

After observing the prepared slides of binary fission in amoeba and budding in following observations were reported:

(A) Single cells of amoeba and yeast were undergoing binary fission and budding respectively


(B) Cytokinesis was observed in the yeast cell.


(C) Elongated nucleus was dividing to form two daughter nuclei in amoeba.


(D) A chain of buds was observed due to reproduction in amoeba.


The correct observation(s) is/are:

 33

While performing the experiment with raisins to determine the percentage of water absorbed by them, a student made following measurements: 1

Mass of water in the beaker = 40 g


Mass of raisins before soaking = 5 g


Mass of raisins after soaking or 2 hours = 8 g


Mass of water left in the beaker after the experiment = 35 g


The percentage of water absorbed by raisins is:

 35

Can we test hard water by using detergent? Write one more method other than using soap to test the hardness of hard water.

 36

Out of potato, sweet potato, radish and carrot; make pairs of Homologous organs and Analogous organs.