Show That Light is Needed for Photosynthesis (Leaving Cert Agricultural Science): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
How long must the plant be kept in darkness during the de-starching step?
How long must the plant be kept in darkness during the de-starching step?
24 hours
Why is the plant de-starched before the experiment begins?
Why is the plant de-starched before the experiment begins?
To increase chlorophyll content
How long should the plant be left under the lamp for photosynthesis to occur?
How long should the plant be left under the lamp for photosynthesis to occur?
2-3 hours
What is the purpose of placing leaves in warm alcohol during the iodine test?
What is the purpose of placing leaves in warm alcohol during the iodine test?
To soften the cell walls
What colour does iodine solution turn when starch is present?
What colour does iodine solution turn when starch is present?
Brown/orange
What colour will foil-covered areas of the leaf turn with iodine solution?
What colour will foil-covered areas of the leaf turn with iodine solution?
Blue-black
What happens to light-exposed areas of the leaf when iodine is added?
What happens to light-exposed areas of the leaf when iodine is added?
They turn green
How should alcohol be heated during the iodine test procedure?
How should alcohol be heated during the iodine test procedure?
Over an open flame directly
Why are leaves boiled in water for 2-3 minutes during the iodine test?
Why are leaves boiled in water for 2-3 minutes during the iodine test?
To add starch
Why are leaves placed on a white tile during the iodine test?
Why are leaves placed on a white tile during the iodine test?
To keep them warm