Plant Tropisms Quiz

1. A tropism:
A is the loss of water through the leaves of a plant
B is the wilting that occurs when a plant receives insufficient water
C occurs when a plant grows in response to a stimulus such as light

2. A plant tropism where the plant responds towards a stimulus is:
A unreliable
B negative
C positive

3. The growth of plant roots towards the earth is:
A geotropism
B gravitropism
C both of the above

4. Auxins responsible for phototropism are produced in the shoot tip called the:
A xylem
B root hairs
C coleoptile

5. The response of certain plants to touch is:
A geotropism
B thigmotropism
C phototropism

6. A plant which may flower and fruit naturally all year round is the:
A chrysanthemum
B tomato
C poinsettia

7. The dropping of leaves and fruit is known as:
A autumn growth
B abscission
C fall

8. Pruning a plant causes it to:
A grow more branches
B become bushier
C both of the above

9. The flowering response is called:
Aphototropism
Bphotoperiodism
Capical dominance

10. Elongation of cells is produced by hormones called:
Agibberellins
Bauxins
Cboth of the above

11. The hormone that plays a major role in leaf loss of deciduous trees is:
Afallic acid
Babscisic acid
Cautumnal hormone

12. Auxins cause a plant to bend towards light because:
Athey are lost through photosynthesis as more light strikes the plant
Bthey increase in amount on the lit side of the plant to lengthen the cells
Cthey concentrate in the dark side of cells to elongate those cells

13. What causes apical dominance?
APruning the ends of tree branches
BShortened side branches occur when there are more auxins in the tips of branches at the top of trees
CNatural occurrence cause by gibberellins

14. What gas is used to encourage unripe bananas to ripen?
Aoxygen
Bcarbon monoxide
Cethylene

15. What causes many flowering plants to flower?
Achanging fertiliser quantities in winter
Bincreasing hours of light in summer
Cchanging duration of darkness each day