Water is vital for the survival of plants - Leaving Cert Biology - Question c - 2014
Question c
Water is vital for the survival of plants.
1. What would you expect to notice after a few hours about the stem and leaves of a plant in an experiment such as the on... show full transcript
Worked Solution & Example Answer:Water is vital for the survival of plants - Leaving Cert Biology - Question c - 2014
Step 1
What would you expect to notice after a few hours about the stem and leaves of a plant in an experiment such as the one shown above?
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Answer
After a few hours, I would expect to see a red coloration in the stem and leaves of the plant. This would indicate that the dye in the water has been absorbed and has moved through the plant tissues.
Step 2
Suggest a reason why a layer of oil was placed on top of the water.
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Answer
A layer of oil on top of the water prevents evaporation. This helps to maintain the water level and ensures that the experiment accurately reflects the plant's water uptake without external loss.
Step 3
Through which microscopic structures does water enter a plant from the soil?
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Water enters a plant from the soil primarily through the root hairs. These tiny structures increase the surface area for absorption, allowing for greater uptake of water.
Step 4
By what process does water enter a plant?
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Water enters a plant by the process of osmosis. This is a passive transport mechanism where water moves from an area of lower solute concentration in the soil to an area of higher solute concentration in the root cells.
Step 5
Explain the term transpiration.
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Answer
Transpiration is the process by which water is lost in the form of water vapor from the plant, primarily through small openings called stomata in the leaves. This process is essential for nutrient transport and helps to regulate temperature within the plant.
Step 6
What are growth regulators in plants?
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Growth regulators in plants are chemicals that control growth and development. They can influence various processes such as cell division, elongation, and differentiation.
Step 7
Give two examples of the use of plant growth regulators.
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Answer
Auxins can be used to promote root formation in plant cuttings.
Gibberellins are used to stimulate fruit ripening and elongation.
Step 8
Plants have evolved certain adaptations that protect them from adverse conditions. List two such adaptations.
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A waxy layer on leaves that reduces water loss.
The ability to close stomata to conserve water during dry conditions.
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