Plant Hormones and Growth Responses

The video tutorial covers plant responses to environmental stimuli, focusing on signal transduction pathways and the role of hormones. It explains how plants, despite being stationary, adjust growth and development in response to stimuli. The tutorial delves into the signal transduction process, where external signals trigger cellular responses, and highlights the importance of plant hormones in coordinating growth. It also explores phototropism, detailing experiments that demonstrate how plants bend toward light due to hormone distribution.

How do plants primarily respond to environmental stimuli?

• By changing color instantly

• By adjusting their growth and development

• By moving towards or away from stimuli

• By producing sounds

What is the first step in the signal transduction pathway in plants?

• Release of calcium ions

• Translation of proteins

• Binding of a signal to a receptor

• Transcription of genes

Which molecule is primarily involved in the transcription process in plants?

• DNA polymerase

• Helicase

• RNA polymerase

• Ligase

What is the role of plant hormones?

• To provide energy

• To coordinate different parts of the plant

• To protect against predators

• To absorb sunlight

Which of the following is NOT a plant hormone?

• Cytokinin

• Thyroxin

• Gibberellin

• Auxin

What does phototropism refer to?

• Movement towards light

• Movement towards gravity

• Movement towards water

• Movement towards nutrients

What was discovered to be the chemical responsible for phototropism?

• Gibberellin

• Cytokinin

• Ethylene

• Auxin

How does auxin affect plant growth?

• By reducing water absorption

• By increasing leaf size

• By stimulating cell elongation

• By inhibiting cell division

What happens when auxin is distributed unevenly in a plant?

• The plant grows straight

• The plant changes color

• The plant bends towards the light

• The plant stops growing

What is the effect of covering the tip of a plant with an opaque cap?

• The plant does not bend towards the light

• The plant changes its color

• The plant grows faster

• The plant bends towards the light