Which plant hormone is widely used as a synthetic herbicide to kill broadleaf weeds in lawns and cereal crops? MCQ with Answer and Explanation

Explanation:
Transpiration from stomata creates negative water potential in leaves, generating a tension (transpiration pull) that draws water upward through the xylem from roots. This cohesion-tension mechanism is the primary driver of water transport in tall trees. Root pressure and capillary action are minor forces.

Explanation:
Telomerase is a ribonucleoprotein enzyme that adds repetitive nucleotide sequences to the ends of chromosomes (telomeres), preventing them from shortening during DNA replication. It is highly active in germ cells, stem cells, and most cancer cells, granting them replicative immortality. In most normal somatic cells, telomerase is inactive, leading to gradual telomere shortening and cellular aging.

Explanation:
Mendel's dihybrid cross (e.g., yellow round × green wrinkled) gave a 9:3:3:1 phenotypic ratio in the F₂ generation, illustrating independent assortment.