Question 8 :
In the following groups of materials, which group(s) contains only non-biodegradable items?

Question 10 :
A considerable part of harmful ultraviolet&#160;radiation from the sun does not reach the surface of the earth. This is because high above the earth's atmosphere is a layer of_________<br/>

Question 14 :
What fraction of the assimilated energy is used in respiration by the herbivores?<br>

Question 15 :
The allotrope of this element is the primary absorber of UV solar radiation in Earth's atmosphere. What element is this?

Question 16 :
Select the option that correctly identifies A, B and C in the given table.<table class="wysiwyg-table"><tbody><tr><td>Organism</td><td>Trophic level</td><td>Food chain</td></tr><tr><td>Eagle</td><td>A</td><td>Grazing</td></tr><tr><td>Earthworm</td><td>Primary consumer</td><td>B</td></tr><tr><td>Frog</td><td>C</td><td>Grazing</td></tr></tbody></table>

Question 17 :
Biodegradable wastes should be separated and kept in blue colour bins for garbage collectors.

Question 19 :
A considerable part of the harmful ultraviolet radiation of the Sun does not reach the surface due to:<br/>

Question 21 :
Freon is not recommended to be used in refrigerators because they:

Question 22 :
Assertion: Chalotine sinks are formed during summer, hence, preventing ozone depletion. Reason: In summer season, nitrogen dioxide and methane react with chlorine monoxide and chlorine radicals.

Question 23 :
The reaction that is not involved in the ozone layer depletion mechanism is the stratosphere is:

Question 26 :
Drinking mineral water drink with low levels ($$\sim$$&#160;0.02 ppm) of pesticide for long period would

Question 28 :
Consider the following statements:<br/>(a) Wastes are of two types, biodegradable and non-biodegradable.<br/>(b) Biodegradable wastes should be separated and kept in blue colour bins for garbage collectors.<br/>(c) Ozone is formed in stratosphere by action of ultraviolet radiations on oxygen.<br/>Which of the above statements are correct?

Question 29 :
Biomagnification refers to an increase in the concentration of the toxicant at successive trophic levels. This happens because