16. Complete the following by filling the blanks 1 to 5 with appropriate words/ terms/ phrases:

Biology | Class 10 | ICSE | Photosynthesis | Selina

To test the leaf for starch, the leaf is boiled in water to (1) ……………. It is next boiled in methylated spirit to (2) ……………. The leaf is placed in warm water to soften it. It is then placed in a dish and (3) …………. solution in added. The region, which contains starch, turns (4) ……………. and the region, which does not contain starch, turns (5) ………………

Solution :

To test the leaf for starch, the leaf is boiled in water to kill the cells. It is next boiled in methylated spirit to with draw chlorophyll. The leaf is placed in warm water to soften it. It is then placed in a dish and iodine solution in added. The region, which contains starch, turns blue-black colour and the region, which does not contain starch, turns brown colour.

i

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A Concave, concave
B Convex, convex
C Convex, concave
D Concave, convex

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(A) active mass
(B) molecular weight
(C) atomic weight
(D) equivalent weight

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(A) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}$
(B) $\mathrm{H}_{2} \mathrm{SO}_{4}$
(C) $\mathrm{H}_{2} \mathrm{SO}_{3}$
(D) $\mathrm{H}_{2} \mathrm{SO}_{5}$

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A …… lens is used to correct myopia and a ….. lens is used to correct hypermetropia.
A Concave, concave
B Convex, convex
C Convex, concave
D Concave, convex

Rate of reaction of any substance depends on
(A) active mass
(B) molecular weight
(C) atomic weight
(D) equivalent weight

Formula of oleum is
(A) $\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{7}$
(B) $\mathrm{H}_{2} \mathrm{SO}_{4}$
(C) $\mathrm{H}_{2} \mathrm{SO}_{3}$
(D) $\mathrm{H}_{2} \mathrm{SO}_{5}$

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Use determinants to show that the following points are collinear. $P(-2,5), Q(-6,-7)$ and $R(-5,-4)$

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