Q. Plants are killed in winter by frost because
1 no photosynthesis occur at low temperature
2 of desiccation
3 water in the plant freezes
4 water in the plants evaporates
Ans: 2
Q. Plants absorb most of the water needed by them through their
1 Embryonic zone
2 Growing point
3 Root hairs
4 Zone of elongation
Ans: 3
Q. Plants absorb dissolved nitrates from soil and convert them into
1 Free nitrogen
2 Urea
3 Ammonia
4 Proteins
Ans: 1
Q. Pigmentation of skin is due to
1 Lymphocytes
2 Monocytes
3 Leucocytes
4 Melanocytes
Ans: 4
Q. Photosynthesis takes place faster in
1 yellow light
2 white light
3 red light
4 darkness
Ans: 2
Q. Photosynthesis is a process
1 reductive and exergonic
2 reductive and catabolic
3 reductive, endergonic and catabolic
4 reductive, endergonic and anabolic
Ans: 4
Q. Photo-Oxidation is
1 Photorespiration
2 Photolysis
3 Light and oxygen induced break down
4 All of the above
Ans: 4
Q. Phloem is a tissue found in
1 Reproductive organs of animals
2 Plants
3 Insects
4 Mammals
Ans: 2
Q. Phenomenon which converts light energy into chemical energy is
1 Respiration
2 Photosynthesis
3 Transpiration
4 None of these
Ans: 2
Q. People who live at high altitudes have rosy cheeks because
1 haemoglobin has an increased binding affinity for oxygen and becomes deep red in colour
2 red cell concentration is considerably above average in response to lowered oxygen pressure
3 the rate of capillary circulation increases in the skin to make it look pinkish
4 all of these
Ans: 2
1 no photosynthesis occur at low temperature
2 of desiccation
3 water in the plant freezes
4 water in the plants evaporates
Ans: 2
Q. Plants absorb most of the water needed by them through their
1 Embryonic zone
2 Growing point
3 Root hairs
4 Zone of elongation
Ans: 3
Q. Plants absorb dissolved nitrates from soil and convert them into
1 Free nitrogen
2 Urea
3 Ammonia
4 Proteins
Ans: 1
Q. Pigmentation of skin is due to
1 Lymphocytes
2 Monocytes
3 Leucocytes
4 Melanocytes
Ans: 4
Q. Photosynthesis takes place faster in
1 yellow light
2 white light
3 red light
4 darkness
Ans: 2
Q. Photosynthesis is a process
1 reductive and exergonic
2 reductive and catabolic
3 reductive, endergonic and catabolic
4 reductive, endergonic and anabolic
Ans: 4
Q. Photo-Oxidation is
1 Photorespiration
2 Photolysis
3 Light and oxygen induced break down
4 All of the above
Ans: 4
Q. Phloem is a tissue found in
1 Reproductive organs of animals
2 Plants
3 Insects
4 Mammals
Ans: 2
Q. Phenomenon which converts light energy into chemical energy is
1 Respiration
2 Photosynthesis
3 Transpiration
4 None of these
Ans: 2
Q. People who live at high altitudes have rosy cheeks because
1 haemoglobin has an increased binding affinity for oxygen and becomes deep red in colour
2 red cell concentration is considerably above average in response to lowered oxygen pressure
3 the rate of capillary circulation increases in the skin to make it look pinkish
4 all of these
Ans: 2
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