Plant Growth, Development, and Response: Plant Responses

The video explains how plants and humans respond to environmental stimuli. It introduces the concept of stimuli and describes various types of tropisms, such as phototropism, gravitropism, and thigmotropism. The video also covers nastic movements, which are non-directional responses to stimuli, and the role of auxins, a plant hormone, in growth responses. Finally, it discusses photoperiodism, the response of plants to the length of darkness, which affects flowering.

What is the term for a plant's growth response towards a stimulus?

• Photoperiodism

• Positive tropism

• Negative tropism

• Nastic movement

Which type of tropism involves a plant's response to gravity?

• Nastic movement

• Thigmotropism

• Gravitropism

• Phototropism

How do nastic movements differ from tropisms?

• They are caused by auxins

• They do not depend on the location of the stimulus

• They are irreversible

• They depend on the direction of the stimulus

What role do auxins play in plant growth?

• They cause plant cells to grow longer

• They cause plant cells to shrink

• They are responsible for photoperiodism

• They help plants respond to touch

What do plants respond to in photoperiodism?

• The length of darkness

• The intensity of light

• The amount of daylight

• The temperature changes