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Question:- 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:- Option C
Question:- 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:- Option B
Question:- 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:- Option A
Question:- Plants receive their nutrients mainly from A. chlorophyll B. atmosphere C. light D. soil
Answer:- Option D
Question:- Movement of cell against concentration gradient is called A. osmosis B. active transport C. diffusion D. passive transport
Answer:- Option B
Question:- Is active transport only against the concentration gradient?
Answer:- Active transport, this is the only transport method that can move species against their concentration gradient (from low to high concentration). Facilitated diffusion only moves species down their concentration gradient from high to low concentration.
Question:- 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
Answer:- Option A
Question:- 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:- Option A
Question:- Plants synthesis protein from A. starch B. sugar C. amino acids D. fatty acids
Answer:- Option C
Question:- Plants absorb dissolved nitrates from soil and convert them into A. free nitrogen B. urea C. ammonia D. proteins
Answer:- Option A
Question:- 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:- Option C
Question:- 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:- Option C
Question:- Plants absorb most part of water needed by them through their A. embryonic zone B. growing point C. root hairs D. zone of elongation
Answer:- Option C
Question:- Photo-oxidation is A. photorespiration B. photolysis C. light and oxygen induced breakdown D. All of the above
Answer:- Option D