4 (a). Flowering plants produce a protein that is sensitive to light - Edexcel - GCSE Biology - Question 4 - 2017 - Paper 1
Question 4
4 (a). Flowering plants produce a protein that is sensitive to light.
The diagram shows the effect of light on this protein.
inactive protein ──────────────── a... show full transcript
Worked Solution & Example Answer:4 (a). Flowering plants produce a protein that is sensitive to light - Edexcel - GCSE Biology - Question 4 - 2017 - Paper 1
Step 1
(i) Complete the sentence by putting a cross (X) in the box next to your answer.
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Answer
The correct answer is C, photoperiodicity. This term refers to the physiological reaction of organisms to the length of day or night.
Step 2
(ii) Explain why fewer hours of daylight cause short-day plants to flower.
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Answer
Short-day plants require longer periods of darkness to trigger the flowering process. When the nighttime duration exceeds a certain threshold, it stimulates the production of the active protein which promotes flowering.
Step 3
(iii) Suggest how flowering can be inhibited in sugar cane.
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Answer
Flowering in sugar cane can be inhibited by maintaining longer light periods or by using substances that extend night duration, effectively deceiving the plant into thinking it is still in a short-day environment.
