Responses to Stimuli: Tropism Flashcards Preview

A2 Biology: Response to Stimuli > Responses to Stimuli: Tropism > Flashcards

Flashcards in Responses to Stimuli: Tropism Deck (12):
1

what is a tropism?

a tropism is the growth of part of a plant in response to a directional stimulus

2

what is a positive response?

the plant grows towards the stimulus

3

what is a negative response?

the plant grows away from the stimulus

4

what is phototropism?

the tropism of a light stimulus

5

what is gravitropism?

the tropism of a gravity stimulus

6

what is hydrotropism?

the tropism of a water stimulus

7

which direction do plant shoots grow with a light stimulus?

shoots grow towards the light (positive phototropism)

8

which direction do plant shoots grow with a gravity stimulus?

shoots grow away from gravity (negative gravitropism)

9

how does the tropism conditions of shoots benefit them?

so their leaves are in the most favourable condition to capture light for photosynthesis

10

which direction do plant roots grow with a light stimulus?

roots grow away from the light (negative phototropism)

11

which direction do plant roots grow with a gravity stimulus?

roots grow towards gravity (positive gravitropism)

12

how does the tropism conditions of roots benefit them?

the response increases the probability that roots will grow into the soil, so they can absorb water and mineral ions better