LBBBIOA Exercise 6: Photosynthesis Introduction

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What is the purpose of placing one Plectranthus plant in the dark for 48 hours?

To study the impact of soil nutrients on photosynthesis

To test the role of darkness in photosynthesis

To examine the effect of water on photosynthesis

To test the role of light in photosynthesis (correct)

What is the next step after cutting off the leaf set-ups from the Plectranthus plant?

Placing the leaves in a water bath

Testing for starch content (correct)

Boiling the leaves in ethyl alcohol

Marking the beakers A and B

What is the purpose of boiling the leaves of the Plectranthus plant in water?

To extract pigments for testing

To remove excess water from the leaves

To increase photosynthesis efficiency

To soften the leaves (correct)

Which solution is used to immerse the boiled leaves for testing?

95% ethyl alcohol Signup and view all the answers

What is the main objective of immersing the boiled leaves in ethyl alcohol?

To extract chlorophyll for analysis Signup and view all the answers

How does placing one pot of Plectranthus plant in sunlight contribute to the experiment?

Enhances photosynthesis efficiency Signup and view all the answers

What is the main function of photosynthesis in plants?

Conversion of light energy into chemical energy Signup and view all the answers

Which of the following is NOT required for photosynthesis to occur?

Oxygen Signup and view all the answers

What is the main product of photosynthesis?

Glucose Signup and view all the answers

Which of the following is NOT a pathway for glucose produced during photosynthesis?

Conversion into oxygen Signup and view all the answers

What are the objectives of a photosynthesis experiment as mentioned in the text?

Measure rate of photosynthesis affected by factors Signup and view all the answers

Where does photosynthesis primarily take place within plant cells?

Chloroplasts Signup and view all the answers

What is the purpose of placing the beaker set-ups in a water bath during the extraction process?

To prevent the alcohol from catching fire Signup and view all the answers

Why is it important not to boil the leaves under direct flame during the pigment extraction process?

To avoid discoloration of the leaves Signup and view all the answers

In the experiment, what does a bluish black color on the leaves indicate?

Presence of starch Signup and view all the answers

Why is it necessary to compare the results between the exposed and covered areas of the leaves in the experiment?

To observe differences in starch presence due to light exposure Signup and view all the answers

What is the role of iodine solution in the experiment conducted on leaves after alcohol extraction?

To indicate the presence of starch Signup and view all the answers

What is the purpose of half-filling test tubes A, B, and C with dilute phenol red solution in the carbon dioxide experiment?

To act as an indicator for carbon dioxide levels Signup and view all the answers