NEET Practice Questions (MCQs) with Answers & Solutions

Abscisic acid (ABA) is a plant hormone that plays a crucial role in helping plants respond to adverse environmental conditions such as drought, cold, and salt stress. It helps in regulating stomatal closure to reduce water loss and induces the expression of stress-responsive genes.

Abscisic acid (ABA) inhibits cell division and growth in plants. It plays a role in maintaining seed dormancy and can suppress the formation of new cells, thereby inhibiting plant growth under stressful conditions.

Abscisic acid (ABA) is responsible for inducing and maintaining seed dormancy. It prevents seeds from germinating under unfavorable conditions by inhibiting the growth of the embryo within the seed.

Ethylene is a simple, volatile hormone that is involved in various processes such as fruit ripening, leaf abscission, and stress responses. It is a gaseous hormone, which makes it volatile.

Abscisic Acid (ABA) does not induce ripening of fruit. Instead, it primarily inhibits seed germination, induces dormancy of buds, and closes stomata. Ethylene is the hormone responsible for fruit ripening.

Imbibition process plays an important role in the germination of seed, rupturing of the seed coat, and the emergence of seedlings is due to imbibition pressure developed by the seed kernel

Photoperiodism is the physiological reaction of organisms to the length of day or night. It is most commonly observed in plants, where it affects flowering and other developmental processes.