The diagram shows a section of a leaf - Leaving Cert Agricultural Science - Question Question a & b & c - 2017
Question Question a & b & c
The diagram shows a section of a leaf.
(i) Name the feature labelled A.
(ii) State two functions of A.
(iii) What is the main function of the cells labelled B?
(... show full transcript
Worked Solution & Example Answer:The diagram shows a section of a leaf - Leaving Cert Agricultural Science - Question Question a & b & c - 2017
Step 1
Name the feature labelled A.
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Answer
A is the Stoma.
Step 2
State two functions of A.
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Answer
Allows for gas exchange by taking in carbon dioxide and releasing oxygen.
Facilitates transpiration by allowing water vapor to exit.
Step 3
What is the main function of the cells labelled B?
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Answer
The main function of the cells labelled B is photosynthesis.
Step 4
State two ways in which the structure of a leaf is suited to its main role.
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Answer
Leaves are broad, providing a large surface area for maximum sunlight absorption.
Stomata are present for gas exchange, allowing carbon dioxide to enter and oxygen to exit.
Step 5
Name a type of plant that would have a stem cross section like this.
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Answer
A Dicot (or named dicot).
Step 6
Name the structures labelled X.
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X refers to the vascular bundles (or vascular tissue), specifically xylem and phloem.
Step 7
State two functions of X.
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The xylem transports water and minerals from the roots to the leaves.
The phloem distributes food (sugars) produced during photosynthesis throughout the plant.
Step 8
Name a plant that has a modified stem.
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Examples include potato or strawberry (or creeping) buttercup.
Step 9
Describe an experiment to show phototropism in seedlings.
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Answer
You can grow seedlings in controlled conditions, providing light from one direction. You should have a control group with light from all sides. Measure the growth of the seedlings over time, noting that those exposed to light from one direction will bend towards the light source.
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