NTSE Biology Nutrition Plants MCQs

Question: The graph below shows the relation between influence of light intensity and CO2 concentration of the rate of photosynthesis of Chlorella. Which one of the following statements explains the diagram correctly ?

• a) At low light intensity, the light dependent reaction is rate limiting but at high light intensity CO2 is rate limiting
• b) The number of chlorophyll molecules limits the rate of photosynthesis
• c) Photosynthesis is independent of light intensity provided there is no total darkness
• d) Chlorophyll responds equally to light intensities and CO2 concentration thereby limiting the rate of photosynthesis

Answer: At low light intensity, the light dependent reaction is rate limiting but at high light intensity CO2 is rate limiting

Question: In photosynthesis which one of the following is the first step ?

• a) Formation of ATP
• b) Ionization of water
• c) Excitation of an electron of chlorophyll by a photon of light
• d) Attachment of CO2 to carbon sugar

Answer: Excitation of an electron of chlorophyll by a photon of light

Question: One quanta some contains

• a) 230 chlorophyll molecules
• b) One chlorophyll molecule
• c) No chlorophyll molecules
• d) Only few chlorophyll molecules

Answer: 230 chlorophyll molecules

Question: Compensation pint refers to the intensity of light at which

• a) Rate of respiration = rate of photosynthesis
• b) Rate of respiration > rate of photosynthesis
• c) Rate of respiration < rate of photosynthesis
• d) None of the above

Answer: Rate of respiration = rate of photosynthesis

Question: During photosynthesis the oxygen in glucose comes from

• a) H2O  
• b) CO2    
• c) Both from H2O & CO2 
• d) Soil

Answer: CO2    

Question: The main difference between photosynthetic and chemo synthetic bacterial is

• a) photosynthetic bacteria are seen in green plants while chemo synthetic bacteria are seen in chemical substances
• b) energy of sunlight is used in photosynthetic bacteria whereas in chemo synthetic bacteria energy is derived by the oxidation of inorganic substances
• c) photosynthetic bacteria are parasite within green plant cells while chemo synthetic bacteria are saprophytes on decrying food substances
• d) H2O (water) is used by photosynthetic bacteria but not by chemosynthetic bacteria 

Answer: energy of sunlight is used in photosynthetic bacteria whereas in chemo synthetic bacteria energy is derived by the oxidation of inorganic substances

Question: Photo phosphorylation means synthesis of

• a) ATP from ADP
• b) NADP
• c) ADP from ATP
• d) PGA

Answer: ATP from ADP

Question: In case of C4 pathway

• a) CO2 combines with PGA   
• b) CO2 combines with PEP
• c) CO2 first combines with RuBP    
• d) CO2 combines with RMP

Answer: CO2 combines with PEP

Question: One quanta some contains

• a) 230 chlorophyll molecules
• b) One chlorophyll molecule
• c) No chlorophyll molecules
• d) Only few chlorophyll molecules

Answer: 230 chlorophyll molecules

Question: Photo phosphorylation means synthesis of

• a) ATP from ADP
• b) NADP
• c) ADP from ATP
• d) PGA

Answer: ATP from ADP