Answer the following questions about a plant root - Leaving Cert Biology - Question 15(c) - 2020
Question 15(c)
Answer the following questions about a plant root.
(i) Draw a diagram of the longitudinal section (L.S.) of a typical root.
(ii) Label any three zones on your diag... show full transcript
Worked Solution & Example Answer:Answer the following questions about a plant root - Leaving Cert Biology - Question 15(c) - 2020
Step 1
Draw a diagram of the longitudinal section (L.S.) of a typical root.
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Answer
A diagram of the longitudinal section of a plant root should include the following elements: a long root tip, root hairs, and labeled zones like meristematic zone, elongation zone, differentiation zone, and root cap.
Step 2
Label any three zones on your diagram.
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Answer
Meristematic Zone (or cell division)
Elongation Zone
Differentiation Zone
Step 3
In which zone is water absorbed from the soil?
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Answer
Water is absorbed from the soil primarily in the Differentiation Zone.
Step 4
Name the process through which water is absorbed from the soil.
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Answer
The process through which water is absorbed from the soil is called Osmosis.
Step 5
Name the tissue that transports water in roots.
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Answer
The tissue that transports water in roots is known as Xylem.
Step 6
Give two ways in which this tissue is adapted to transporting water.
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Xylem vessels are hollow and continuous, facilitating easy water flow.
Xylem has pits that are wetted by lignin, which help in water regulation.
Step 7
Describe the mechanism by which water moves through this tissue to the leaves in a plant.
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Water movement through the xylem to the leaves is facilitated by a combination of cohesion and adhesion, where water molecules stick to each other and to the xylem walls. As water evaporates from the leaves through transpiration, it creates a tension that pulls water upward through the xylem, supported by the bonding of the water molecules.
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