Questions
When the light intensity increases, which of the following becomes the limiting factor?
- Oxygen
- Sulphur dioxide
- Carbon dioxide
- Water
The non-polar part of chlorophyll is_____________.
- phytol
- pyrrol
- porphyrin
- CH bridges
While conversion of phosphoglyceric acid into phosphoglyceraldehyde during photosynthesis, which of the following reactions occurs?
- Oxidation
- Reduction
- Electrolysis
- Hydrolysis
Stomata of CAM (crassulacean acid metabolism) plants are___________.
- open during the night and close during the day
- always remain open
- open during the day and close at night
- never open
Kranz anatomy is the characteristic of ________________.
- all C3 plants
- all C4 plants
- only maize
- only sunflower
Which of the following statements is not true?
- C3 plants lack hatch slack pathway.
- C4 plants exhibit calvin cycle.
- C3 plants respire in the presence of light.
- C4 plants also show C2 cycle.
DCMU is a herbicide, which can kill plants by_________________.
- inhibiting photolysis of water as it inhibits PS1
- inhibiting photosynthesis as it inhibits PS2
- inhibiting photosynthesis as it inhibits PS1
- checking respiration as it produces inhibitory effect on dehydrogenase
If plant is first exposed to light of 730 nm wavelength and then to 660 nm wavelength, the plant will ___________.
- resume normal growth
- show inhibited growth
- not grow at all
- die immediately
Which of the following is a co-factor in the evolution of oxygen?
- Copper
- Magnesium
- Iron
- Manganese
Which cycle occurs in sugarcane?
- Hatch slack
- Calvin cycle
- Photorespiration
- C2 cycle
Photorespiration is favoured by
- high oxygen and low carbon dioxide
- low temperature
- low light intensity
- low oxygen and high carbon dioxide
At which step does carbon dioxide come into play during photosynthesis?
- First step of the light reaction
- Last step of photosynthesis
- First step of photophosphorylation
- Dark phase
If photosynthesis proceeds for an hour in atmosphere with radioactive carbon dioxide, then the labelled carbon will be mostly found in
- sugar
- starch
- both sugar and starch
- phosphoglyceralaldehyde
Light trapping reaction takes place in
- chloroplast
- grana
- lamella
- stroma
Which of the following statements is correct regarding C3 plants?
- Bundle sheath cells are granal and mesophyll cells are agranal.
- Bundle sheath cells are agranal and mesophyll cells are granal.
- Both bundle sheath cells and mesophyll cells are agranal.
- Both bundle sheath cells and mesophyll cells are granal.