Nutrition in Green plants Assignment

Nutrition in Green plants Assignment

Activity 1

Finding out the need for carbon dioxide in the formation of starch

Key question

Is carbon dioxide necessary for photosynthesis?

What you need

Test tubes

Beaker

lodine solution

Source of heat Methylated spirit/ethanol

Retort stand with 2 clamps

Plant with normal green leaves

Test tube holder

Sodium bicarbonate

Water

White tile Stirring rod/dropper

Vaseline

Two split cocks

Two conical flasks

What to do need

In your groups carry out the following instructions to show the Detach one leaf from the plant and test it for starch following the procedure in activity 4.3 to ensure no starch is present.

2 Enclose one leaf in a clear glass flask containing solid lime which will absorb carbon dioxide.

3 Enclose another leaf in a clear glass flask containing sodium bicarbonate solution which will release carbon dioxide. The leaf stalks should pass through a split cork which has been vaselined.

4 Support each flask with a clamp on a metal stand.

5 Put the plants in light for 3 hours.

6 Test each leaf for presence of starch and record your observation.

7 Write a report on experiments using the following format: title, question, prediction, materials procedure, record of results, analysis of results and conclusion.

8 Present your report to the rest of the class.

Questions

1 Which leaf is the control experiment?

2 Why are the split corks vaselined?

3 Explain your results.

Activity 2

Structure of a leaf in relation to photosynthesis

Key question

Finding out the structures that enable a leaf to carry out the process of photosynthesis What structures enable a leaf to carry out photosynthesis?

What you need ·

Leaves .

Hand lens

Microscope

Biology textbooks/computer with internet.

Slides and cover slips/already prepared slides of leaves

What to do

1 In groups, collect leaves from the surrounding of the school.

2 Discuss the structure of the leaf.

3 Research on the leaf structure from internet/Biology textbooks.

4 Draw anda large drawing of the leaf.

5 Observe the already mounted leaf on the microscope. The teacher will help you to observe the structure.

6 Compare what you have observed to the already drawn structure in the textbook/internet.

7 Use a suitable method to report your findings to the rest of the class.

There is no simple experiment which can be done to find out cannot remove all the water from the plant without killing it. if water is necessary for photosynthesis.

This is because we These experiments confirm that carbondioxide – light and chlorophyll are necessary for photosynthesis.