U8L13 Plant responses

What is the name of the hormone that controls plant responses to stimuli?

What is the name of a plant's response to light?

Which of the following is not true of auxin?

• It causes cell elongation

• It is produced by shoot tips

• It diffuses down the stem

• It accumulates in illuminated cells

How does auxin work?

• It causes shaded cells to elongate

• It causes illuminated cells to elongate

• It causes shaded cells to shrink

• It causes illuminated cells to shrink

What is the name of a plant's response to gravity?

Which of the following is true?

• Plant stems grow towards light and away from gravity

• Plant stems grow away from light and towards gravity

• Plant roots grow towards light and away from gravity

• Plant roots grow away from gravity and towards light

When a seed is planted in soil, regardless of its orientation, the shoots will grow upwards and the roots will grow downwards. What is the reason for this?

• Phototropism

• Geotropism

If the tip of a plant's shoot is removed and light is shone only from one side, which way would the plant grow?

• Towards the light

• Away from the light

• Straight up

• It would stop growing

Which hormone causes plant stems to grow towards light?

• Auxin

• Phototropism

• Geotropism

• Photosynthesis

Plant roots grow downwards. What causes this?

• Phototropism

• Geotropism