1. Ordinary table salt is sodium chloride. What is baking soda?
A. Potassium chloride
B. Potassium carbonate
C. Potassium hydroxide
D. Sodium bicarbonate
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
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
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
5. Movement of cell against concentration gradient is called
A. osmosis
B. active transport
C. diffusion
D. passive transport
6. Photosynthesis generally takes place in which parts of the plant?
A. Leaf and other chloroplast bearing parts
B. stem and leaf
C. Roots and chloroplast bearing parts
D. Bark and leaf
7. 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
8. Plants synthesis protein from
A. starch
B. sugar
C. amino acids
D. fatty acids
9. Plants absorb dissolved nitrates from soil and convert them into
A. free nitrogen
B. urea
C. ammonia
D. proteins
10. 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
11. 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