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Factors of photosynthesis

Last updated over 4 years ago
15 questions
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)
1

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

1

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.
1

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
1

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
1

State the obsevation of the practical.

1

What is the conclusion of the practical?

1

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

1

What does potassium hydroxide do?

1

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

1

What does the alcohol do to the leaf?

1

What does iodine test do?

1

What was the observation of the practical above?

1

What was the conclusion of the practical above?

1

What was the oservation of the practical above?

1

What is the conclusion of the practical above?