C3.1 HL

What is a tropism?

• A plant's lifecycle phase

• A method of seed dispersal

• Growth response to a certain stimuli

• A type of plant hormone

What does positive tropism mean?

• Staying stationary despite the stimulus

• Growing towards the stimulus

• Shrinking in response to the stimulus

• Growing in the opposite direction of the stimulus

Which example demonstrates positive gravitropism?

• Shoots growing towards light

• Roots growing downwards

• Flowers opening during the day

• Leaves changing color in autumn

What is phototropism?

• Growth in response to light

• Growth in response to gravity

• Growth in response to temperature

• Growth in response to water

What role do phytohormones play in plants?

• They help in seed dispersal

• They are responsible for photosynthesis

• They provide structural support

• They control growth and development

Which hormone is known for causing stem elongation?

• Auxin

• Ethylene

• Cytokinin

• Gibberellin

What is the primary function of auxin?

• Enhancing photosynthesis efficiency

• Facilitating seed dispersal

• Promoting fruit ripening

• Controlling tropisms and other growth processes

How do cells in a plant coordinate to achieve phototropism?

• By releasing ethylene gas towards the light

• By moving auxin efflux carriers to facilitate auxin movement

• By pumping water to the side away from light

• By moving chloroplasts to the side facing light

What triggers the elongation of cell walls in plants?

• Decrease in pH due to proton pumps

• Increase in temperature

• Absorption of more sunlight

• Production of more chlorophyll

How does ethylene affect fruit ripening?

• It changes the fruit's color without affecting ripeness

• It promotes ripening through a positive feedback loop

• It has no effect on ripening

• It slows down the ripening process