Understanding Phototropism and Auxins in Plants

The video explains how plants make their own food through photosynthesis, acting like biological solar panels. It introduces the concept of tropism, specifically phototropism, where plants move in response to light. An experiment with bean sprouts demonstrates this phenomenon, showing how plants grow towards a light source. The role of auxins, plant hormones that cause cells to elongate, is discussed, explaining how they accumulate on the darker side of the plant, causing it to bend towards the light.

What is the primary function of leaves in photosynthesis?

• To absorb water

• To absorb light

• To absorb nutrients

• To absorb carbon dioxide

What does the term 'phototropism' refer to?

• Plants growing towards nutrients

• Plants growing towards light

• Plants growing towards water

• Plants growing towards heat

In the experiment, what was used to allow light to enter the box?

• A transparent lid

• A glass window

• A hole in the top

• A section cut out of the side

What are auxins?

• Light-absorbing pigments

• Nutrients for plants

• Hormones that send messages through a plant

• Water-absorbing cells

How do auxins affect plant cells on the darker side?

• They make the cells absorb more water

• They make the cells grow longer

• They make the cells shorter

• They make the cells produce more chlorophyll

What happens to a plant when auxins accumulate on one side?

• The plant bends away from the light

• The plant stops growing

• The plant bends towards the light

• The plant grows straight

What is the result of auxins causing cells to grow longer on one side?

• The plant stops growing

• The plant grows wider

• The plant grows taller

• The plant bends towards the light

What is the main effect of auxins on plant growth direction?

• They cause the plant to grow towards the light

• They cause the plant to grow upwards

• They cause the plant to grow downwards

• They cause the plant to grow away from the light

What is the role of auxins in phototropism?

• They help the plant absorb more water

• They help the plant absorb more nutrients

• They help the plant grow taller

• They help the plant bend towards the light

What is the significance of auxins in plant growth?

• They help plants grow in any direction

• They help plants grow towards water

• They help plants grow towards light

• They help plants grow away from light