EduNinja• Describe phototropism as a response in which parts of a plant grow towards or away from the direction of the light source
The nervous system coordinates the responses of animals to changes in their environment.
Fig. 2.3 shows three pots of seedlings that have been kept in different conditions.
Fig. 2.3
State the name of the growth response shown by the seedlings in pot R.
Fig. 2.1 is a flow chart that shows the events that occur as light travels through the eye.
Fig. 2.1
A plant, Arabidopsis thaliana, was placed on its side in the dark. Fig. 2.2 is a series of drawings made of the plant, over seven days, as it responded to a change in its surroundings.
Fig. 2.2
State the stimulus to which the plant responded.
Name the growth response shown by the plant.
Fig. 3.1 shows a growing plant. The plant is growing in the dark.
Fig. 3.1
State the name of the growth response shown by the plant shoot in Fig. 3.1.
What is meant by the term phototropism?
absorbing mineral ions using light energy
directional growth in response to gravity
directional growth in response to light
making food using light energy
In an experiment to investigate phototropism, a plant shoot is grown with light coming from one side only.
After two days, in which region has the greatest rate of growth occurred?
after two days
The diagram shows an experiment on oat seedlings. All the seedlings are exposed to light from directly above.
Which seedling will grow to the left?
Fig. 4.1 shows a dandelion plant, Taraxacum officinale, in a field. The flower stalk is called a scape.
Fig. 4.1
The scape of a dandelion responds to sunlight by growing upwards.
State the name of this growth response.