Plant Tissues, Organs & Systems - exam practice
Plant Tissues, Organs & Systems
Question 1 of 5
A student is studying the different types of plant tissues.
List three types of plant tissue and state their functions.
Water enters a plant through root hair cells.
Root hair cells have:
Identify structures A, B, and C in the following diagram of a root hair cell, and describe their functions.
Explain how the features of root hair cells are advantageous for the plant.
Stomata are cell structures in the epidermis of tree leaves and needles.
Explain the role of stomata and guard cells in plants.
Explain why stomata are typically found on the lower epidermis of leaves.
Suggest why stomata can close at night.
Explain how the structure of guard cells allows them to control the opening and closing of stomata.
A student is studying the structure of a leaf.
Label the diagram of a leaf cross-section and state the functions of the labelled parts.
A student compared the number of stomata on the upper and lower surfaces of a leaf.
The student followed the method below:
- Coat the leaf with clear nail varnish.
- Remove the layer of nail varnish.
- Place the leaf impression on a microscope slide and cover it with a coverslip.
- Use the microscope to observe the leaf impression.
The layer of nail varnish shows an impression of the cells on the surface of the leaf.
Why is a coverslip placed on top of the leaf impression?
Explain why the student prepared a leaf impression with nail varnish rather than attempting to observe the whole leaf with a microscope.
The student observed that the stomata were open.
Describe how stomata open.
A biologist investigated how different mineral ion concentrations in the soil impact the growth of a particular plant species.
The biologist:
- planted seeds in pots with varying concentrations of mineral ions (1%, 2%, and 3%)
- recorded the plant height every week for four weeks
The results are presented in the following table:
Describe the effect of increasing ion concentration in the soil on the growth of the plant.
Calculate the average weekly growth of the plant in the 2% ion concentration.
Explain how active transport is related to the observed growth of the plants in this experiment.
Suggest a way the biologist could modify the experiment to test the effect of different types of ions on plant growth.
Identify a potential source of error in this experiment and suggest a way it could be minimised.