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Factors of photosynthesis

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Last updated over 4 years ago
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Thursday 14/05/2020

Lesson objectives

- To show that sunlight, carbon dioxide is required for photosynthesis
- To show that oxygen is evolved during photosynthesis

This lesson looks at 3 different practicals that you should know.

Questions from these 3 practicals frequently appear in SPE

So please do watch the video carefully and answer the questions that follows.
( hint: answers to questions are inside the video, so pause while watching)
Question 1
1.

How long should the pant be kept in the dark room?

Question 2
2.

Why should the plant be kept in the dark room for 3 days?

Alcohol removes the chlorophyll present in the leaves and decolourises the leaf.
Question 3
3.

What does the alcohol do to the leaf?

We placed the leaf after removing from the alcohol into a beaker of water.
This is to remove the alcohol on the leaf
Question 4
4.

Why do we wash the leaf after taking it out from the alcohol?

Hint:- we use the word ( iodine turns from brown to blue - black)

When starch is present iodine turns to blue-black
Question 5
5.

State the obsevation of the practical.

Question 6
6.

What is the conclusion of the practical?

Question 7
7.

How long should the plant be kept in the dark for?

Question 8
8.

What does potassium hydroxide do?

Question 9
9.

Why should the plants be kept in the sunlight for 2 hours?

Question 10
10.

What does the alcohol do to the leaf?

Question 11
11.

What does iodine test do?

Question 12
12.

What was the observation of the practical above?

Question 13
13.

What was the conclusion of the practical above?

Question 14
14.

What was the oservation of the practical above?

Question 15
15.

What is the conclusion of the practical above?