Achieving successful rooting of cuttings is difficult in some shrub species. An experiment was undertaken to determine whether juvenile shoots (J) of shrubs root more successfully than mature shoots (M).
Distinguish between the rooting success of the juvenile shoots and the mature shoots.
Suggest one reason for the difference in the rooting success in the juvenile shoots and the mature shoots.
Outline one variable that would need to be controlled in this experiment.
Auxin is a hormone that can be applied to improve the percentage success of rooting in those study plants with poor rooting success. Explain the effects of auxin on plant cells.
Which plant hormone is responsible for the closing of the stomata?
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Which flower structures are indicated by the letters Y and Z ?
Y | Z | |
---|---|---|
A. | Ovule | Filament |
B. | Ovule | Style |
C. | Ovary | Style |
D. | Ovary | Filament |
The diagram shows a section through a typical dicotyledonous leaf.
Which correctly identifies the main functions of the structures labelled X, Y and Z?
X | Y | Z | |
---|---|---|---|
A. | support | gas exchange | photosynthesis |
B. | transport products of photosynthesis | photosynthesis | water conservation |
C. | gas exchange | water conservation | light absorption |
D. | transport water | support | gas exchange |
Which graph represents the effect of humidity on the transpiration rate in plants?
What is a difference between the features of monocotyledons and dicotyledons?
Monocotyledons | Dicotyledons | |
---|---|---|
A. | Tap roots | Fibrous roots |
B. | Two seed-leaves | One seed-leaf |
C. | Vascular tissue in rings in the stem | Vascular tissue scattered through the stem |
D. | Parallel-veined leaves | Net-veined leaves |
What is the role of in plants?
Outline how the properties of water make it an effective coolant for the body.
Describe how changes in weather conditions affect the transport and loss of water in plants.
Explain how water balance is restored in mammals when they are dehydrated.
Students investigated the environmental factors needed for germination, using seeds from 20 different plant species. Which factors would prevent germination if they are absent?