a) (i) What do you understand by the term adverse external environment?
(ii) Give two ways in which plants protect themselves from adverse external environments - Leaving Cert Biology - Question 11 - 2011
Question 11
a) (i) What do you understand by the term adverse external environment?
(ii) Give two ways in which plants protect themselves from adverse external environments.
(b... show full transcript
Worked Solution & Example Answer:a) (i) What do you understand by the term adverse external environment?
(ii) Give two ways in which plants protect themselves from adverse external environments - Leaving Cert Biology - Question 11 - 2011
Step 1
What do you understand by the term adverse external environment?
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Answer
Adverse external environments refer to conditions or surroundings that pose challenges or threats to the survival and growth of organisms, including plants. These conditions can include extreme temperatures, drought, flooding, high salinity, or the presence of harmful organisms.
Step 2
Give two ways in which plants protect themselves from adverse external environments.
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Answer
Physical Barriers: Plants may develop thick cuticles to reduce water loss and protect against herbivory.
Dormancy: Some plants enter a dormant state during unfavorable conditions, allowing them to conserve energy and resources until the environment improves.
Step 3
Name the group of substances in plants which control responses to external stimuli.
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Answer
(Plant) growth regulators or auxins (or other named group).
Step 4
What name is given to the regions in plants in which these substances are produced?
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Answer
Meristems.
Step 5
Give locations for two of these regions.
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Answer
Root tip.
Shoot apex.
Step 6
Most plant shoots are positively phototropic. Explain the underlined term.
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Answer
Positively phototropic refers to the growth of plant shoots towards a light source. This response enables plants to maximize their exposure to sunlight for photosynthesis.
Step 7
How does the plant benefit from this response?
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Answer
This response results in increased photosynthesis as shoots grow towards light, allowing the plant to produce more energy and grow effectively.
Step 8
Explain the mechanism of response by a plant to a named external stimulus.
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Answer
When light is detected on one side of the plant, auxins are unevenly distributed, causing the cells on the shaded side to elongate more than those on the lighted side. This differential growth results in the bending of the plant towards the light source.
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