Plant Growth Responses and Auxin

The video explains how plants, like animals, respond to environmental stimuli to enhance survival. It introduces the concept of tropisms, which are growth responses to stimuli such as light and gravity. The video discusses how shoots and roots exhibit positive and negative tropisms, and the role of the hormone auxin in facilitating these growth responses by causing cell elongation and division.

Which plant is known for folding its leaves when touched?

• Sunflower

• Mimosa pudica

• Cactus

• Venus flytrap

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

• Transpiration

• Tropism

• Respiration

• Photosynthesis

What is positive phototropism?

• Growth away from light

• Growth towards light

• Growth towards gravity

• Growth away from gravity

How do shoots respond to gravity?

• Positively phototropic

• Negatively phototropic

• Negatively geotropic

• Positively geotropic

Why do roots grow downwards?

• To find more light

• To avoid gravity

• To escape predators

• To access water and minerals

What hormone is primarily responsible for plant tropisms?

• Ethylene

• Gibberellin

• Cytokinin

• Auxin

Where is auxin produced in a plant?

• In the roots

• At the tip of the shoot

• In the stem

• In the leaves

How does auxin affect plant cells?

• It inhibits cell growth

• It causes cell elongation and division

• It reduces photosynthesis

• It increases water absorption

What happens to auxin distribution when light direction changes?

• It stops being produced

• It remains evenly distributed

• It moves to the shaded side

• It moves to the lighted side

What is the result of auxin moving to the shaded side of a plant?

• The plant grows uniformly

• The plant bends towards the light

• The plant grows away from the light

• The plant stops growing