9.3 (Growth in plants)

Auxin

a plant hormone that causes the elongation of cells in shoots and is involved in regulating plant growth.

Meristem

a region of plant tissue, found chiefly at the growing tips of roots and shoots and in the cambium, consisting of actively dividing cells forming new tissue.

Micropropagation

the propagation of plants by growing plantlets in tissue culture and then planting them out.

Shoot apex

the tip of a shoot, the apical or lateral shoot meristematic dome together with the leaf primordial, from which emerge the leaves and sub-adjacent stem tissue.

Stem

the main body or stalk of a plant or shrub, typically rising above ground, but occasionally subterranean.

Tropisms

the turning or bending movement of an organism or a part of an organism toward or away from an external stimulus, such as light, heat, or gravity.

undifferentiated cells in the meristem

Indeterminate growth of plants throughout their lives is due to the ____________________________________________________ that can continuously produce new cells.

apical dominance

Auxin inhibits the growth of the axillary buds, causing the plant to grow vertically upwards to trap more light for photosynthesis.

Phototropism

plant directional growth in response to light

gravitropism or geotropism

the way a plant grows or moves in response to gravity