Plant Growth and Development Biology Quiz for NEET

Roots, stems show continuous, indeterminate growth due to presence of apical meristem.

Leaves, fruits, flowers show closed, determinate growth due to intercalary meristem.

These cells are in state of continuous division i.e, they are capable of self perpetuation, have power to continue indefinitely through division.

Auxins prevent premature leaf and fruit fall.
NAA prevents fruit drop in tomato; 2,4-D prevents fruit drop in Citrus.

Photochrome is a blue-green pigment which absorb red and far red light. It is a coloured protein i.e. chromoprotein.

Bioassay – It is a quantitative and qualitative test used to determine the nature and function of a biochemical by using living material

Auxin accumulated towards dark side and increase cell elongation, then bending occurs.

Gibberellin as it helps in regulating growth and flowering in plants. It also helps in elongation of cells in plants, which causes elongation of shoot. It is considered as a growth hormone in plants.

In the presence of light, florigen migrates from shoot to buds for inducing flowers.

Auxins promote root initiation. Auxin induces both, growth of pre-existing roots and adventitious root formation i.e., branching of the roots.

Oxygen deficiency occurs due to water logging, thus growth is inhibited.

It is not producing energy. It helps in maintaining turgidity, cell elongation and in enzymatic activities.

Abiotic means non-living. Light is not required for early growth but growth will continue only in its presence.

Water, nutrients, oxygen are required for early growth.

Cork, secondary cortex and secondary xylem all are secondary structure formed from dedifferentiated cell by redifferentiation and are responsible for secondary growth.

Ethylene do ripening