Premature leaf fall is due to deficiency of
N2-fixing blue-green alga Anabaena which is extensively used in rice cultivation, forms symbiotic association with
What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N2 fixation?
If a plant shows a symptom which could develop due to deficiency of more than one nutrient, how would you find out experimentally, the real deficient mineral element?
In the initial phase of mineral ion absorption, there is a rapid uptake of ions into ______ space of cells. Ions absorbed in this phase are ______ exchangable. It is _____ uptake as it ______ the expenditure of metabolic energy.
Apoptosis is programmed cell death characterised by the formation of apoptotic bodies whereas necrosis characterised by bursting of cells. Which of the following condition/s lead/s to necrosis ?
i) Gaps and nicks formed in DNA during replication cannot be repaired.
(ii) Developing neurons fail to make synapses with neighbouring cells.
(iii) Heart muscle cells damaged by oxygen depletion followed by cardiac infarction.
Nitrogen and hydrogen combine to form ammonia under high temperature and pressure conditions this is an example of