BIOLOGY

1.	Ordinary table salt is sodium chloride. What is baking soda?
	A. Potassium chloride B. Potassium carbonate C. Potassium hydroxide D. Sodium bicarbonate Answer & Explanation Answer: Option D

2.	Ozone hole refers to
	A. hole in ozone layer B. decrease in the ozone layer in troposphere C. decrease in thickness of ozone layer in stratosphere D. increase in the thickness of ozone layer in troposphere Answer & Explanation Answer: Option C

3.	Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to
	A. angiosperms B. gymnosperms C. monocotyledons D. dicotyledons Answer & Explanation Answer: Option B

4.	Pollination is best defined as
	A. transfer of pollen from anther to stigma B. germination of pollen grains C. growth of pollen tube in ovule D. visiting flowers by insects Answer & Explanation Answer: Option A

5.	Plants receive their nutrients mainly from
	A. chlorophyll B. atmosphere C. light D. soil Answer & Explanation Answer: Option D

6.	Movement of cell against concentration gradient is called
	A. osmosis B. active transport C. diffusion D. passive transport Answer & Explanation Answer: Option B

7.	Photosynthesis generally takes place in which parts of the plant?
	A. Leaf and other chloroplast bearing parts B. steam and leaf C. Roots and chloroplast bearing parts D. Bark and leaf Answer & Explanation Answer: Option A

8.	Most fish do not sink in water because of the presence of swim bladder air bladder air sacs air in spongy bones
	A. I and II are correct B. II and III are correct C. III and IV are correct D. I, II, III and IV are correct Answer & Explanation Answer: Option A

9.	Plants synthesis protein from
	A. starch B. sugar C. amino acids D. fatty acids Answer & Explanation Answer: Option C

10.	Plants absorb dissolved nitrates from soil and convert them into
	A. free nitrogen B. urea C. ammonia D. proteins Answer & Explanation Answer: Option A

11.	Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with
	A. all gymnosperms, except conifers B. only angiosperms C. only conifers D. angiosperms and all gymnosperms except conifers Answer & Explanation Answer: Option C

12.	One of the following is not a function of bones.
	A. Place for muscle attachment B. Protection of vital organs C. Secretion of hormones for calcium regulation in blood and bones D. Production of blood corpuscles Answer & Explanation Answer: Option C