Which one of the following statements is correct ?
Options
(a) Both Azotobacter and Rhizobium fix atomspheric nitrogen in root nodules of plants (b) Cyanobacteria such as Anabaena and Nostoc are important mobilizers […]
Carbohydrates are commonly found as starch in plant storage organs. Which of the following five properties of starach (a-e) make it useful as a storage material? (A) Easily translocated (B) Chemically non-reactive (C) Easily digested […]
Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm […]
The repture and fractionation do not usually occur in the water column in vessel / tracheids during the ascent of sap because of
Options
(a) lignified thick walls (b) cohension and adhesion (c) […]
Read the following four statements (A-D).
Options
(a) Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane (b) In dicot stems, a new cambium originates from cellls of pericycle […]
Which one of the following is correctly matched about plant nutrients?
Options
(a) Passive transport of nutrients – ATP (b) Asoplast – Plasmodesmata (c) Potassium – Readily immobilisation (d) Bakane of rice seedlings […]
Which one of the following is wrong statement about nitrogen fixing?
Options
(a) Anabaena and Nostoc are capable of fixing nitrogen in free living state also. (b) Root nodule forming nitrogen fixers live […]
Which two distinct mictobial processes are responsible for the release of fixed nitrogen as dinitrogen gas (N) to the atmosphere?
Options
(a) Anaerobic ammonium oxidation, and denitrification (b) Aerobic nitrate oxidation, and nitrite […]
Nitrifying bacteria:
Options
(a) Oxidize ammonia to nitrates (b) convert free nitrogen to nitrogen compounds (c) convert proteins into ammonia (d) reduce nitrates to free nitrogen
Correct Answer:
Oxidize ammonia to nitrates
Explanation: […]
Guard cells help in:
Options
(a) transpiration (b) guttation (c) fighting against infection (d) protection against grazing
Correct Answer:
transpiration
Explanation:
Guard cells help in transpiration. Transpiration is the evaporation of water from […]
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