Plant Growth And Development

The correct answer is (A): (a)-3, (b)-1, (c)-4, (d)-2

Malting is essential for preparation of beer etc. It involves soaking of seeds to initiate germination and then drying them after some time to prevent further germination. As gibberellins induce seed germination of light sensitive seeds like barley even in complete darkness, they are thus used to enhance malting in barley. Auxins generally inhibit the flowering but in pineapple spraying of certain auxins initiates uniform flowering in the whole crop. Senescence of leaves results in their decolouration, protein degradation and shedding from plants. Cytokinins delay leaf senescence (Richmond-Lang effect).