Leaf senescence is inhibited by which of the following?

Which plant hormone is used to induce organogenesis during tissue culture in plants?

Richmond-Lang effect is related with . . . . . . .

Several horticultural techniques are followed for the production of 'bonsai' plants. One of them is the drastic pruning of the root system. Which of the following physiological factors is involved in that method?

Cytokinins are said to be anti-ageing hormones because they delay senescence by:

Explain the plant hormone discovered from the sperm of herring fish.