Through their effects on plant growth regulators, what do the temperature and light control in the plants?

Read the following four statements (A $$-$$ D). phosphorylation involve uphill transport of protons across the membrane.
(A)  Both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.
(B)  In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth.
(C)  Stamens in flowers of Gloriosa and Petunia are polyandrous.
(D)  Symbiotic nitrogen fixers occur in free-living state also in soil.

How many of the above statements are right?

Identify the meiotic stage in which the homologous chromosomes separate while the sister chromatids remain associated at their centromeres.

Which one of the following biomolecules is correctly characterized?