plant hormones

Question 1

plan an investigation to show the effect of light from one direction on the growth of plant seedlings

Answer 1

• measure the height of the shoots using a ruler
• place one pot of seedlings in the dark with light from one side
• place one pot with light all around it as a control variable
• keep the temperature the same
• after 2 days record the direction the seedlings grow in/to
• re measure the height of the shoots
• to measure the bent shoots use a thread to straighten them out and measure length of thread with ruler
• calculate the mean height increase for each group/pot of seedlings
• then compare the growth of plants with light from one direction with plants in full light

Question 2

explain how phototropism in a plant shoot helps the plant to survive?

Answer 2

• since the plants grows towards the sunlight it absorbs more sunlight
• so more photosynthesis
• so plant produces more glucose

Question 3

what effect does auxin have on the appearance of a plants root?

Answer 3

• the auxin accumulated on the lower side of the plants which causes an uneven distribution of auxin
• so the top grows faster than the bottom in the root causing it to grow downwards towards gravity