Plant Hormones - exam practice
Plant Hormones
Question 1 of 4
Auxins are plant hormones.
Auxin causes the shoot of a plant to grow towards light in a process called:
Name one other tropism and state the stimulus the plant responds to in the tropism named.
A student wants to investigate the effect of light on plant growth.
The student will do the experiment at school, and has access to laboratory equipment.
The student also has:
- a lamp
- pots of seedlings
- scissors
- a ruler
- cardboard boxes with lids
Plan an investigation to show the effect of light on the growth of plant seedlings.
Include the variables of the experiment in your plan.
A student decided to investigate the directional growth of plant roots.
The student positioned the root of a plant horizontally in a dark room, and left it for 3 days.
Figure A shows the root on the day the student left it, and figure B shows the root after 3 days.
The growth of plant roots in response to the gravity is called:
Give two reasons why the ability to change direction is important for plant roots.
A plant pot was knocked over by a cat.
Figure A shows the plant pot immediately after being knocked over.
Figure B shows the plant pot a week later.
The growth of plant shoots in response to gravity is called:
Give two changes that occurred in the plant in the five days after being knocked over.
A group of students performed an experiment to investigate the growth of plant shoots in response to light.
The students grew seeds until short shoots appeared.
They then used aluminium foil to cover different parts of the shoots, and placed them next to a light source.
The students put boxes over the shoots to keep out any other light.
What is the purpose of the aluminium foil?
Give two variables that the students should control in the investigation.
Complete the diagram below to show the appearance of shoots A, B and C after 3 days.
Explain how phototropism in a plant shoot helps the plant to survive.