Gravitrophism In Plants

The video explains how plants respond to gravity through gravitropism, with roots exhibiting positive gravitropism by growing downward and stems showing negative gravitropism by growing upward. The hormone auxin plays a crucial role in these processes, with its distribution and concentration affecting cell elongation differently in roots and stems. Statocytes in root caps help sense gravity, causing auxin to accumulate and inhibit root cell elongation, while in stems, auxin promotes cell elongation, enabling upward growth.

What is the term used to describe the growth of roots in the direction of gravity?

• Hydrotropism

• Positive gravitropism

• Negative gravitropism

• Phototropism

Which hormone is primarily responsible for gravitropism in plants?

• Auxin

• Ethylene

• Gibberellin

• Cytokinin

In which part of the plant does auxin inhibit cell elongation?

• Flowers

• Roots

• Leaves

• Stem

What is the effect of auxin on stem tissues?

• Inhibits cell elongation

• Stimulates cell elongation

• No effect

• Causes cell death

What are statocytes and where are they located?

• Cells that sense light, located in leaves

• Cells that sense gravity, located in root caps

• Cells that store water, located in stems

• Cells that produce auxin, located in flowers