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Seed Germination Index

To find out if water is needed for seed germination
To find out if air is needed for seed germination
To see if temperature has an effect on the
germination of seeds

To see if light is needed for seeds to germinate
Summary of the Conditions needed for Germination
To see if Carbon Dioxide is given off by
Germinating Seeds

To see if Energy is given out by
Germinating Seeds

Germinating and Growing Seedlings
Looking at the Structure of a Seedling

Biology Practical Work index

Seed Structure

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Drawing bean seed ©  Shirley Burchill

 

Drawing bean seed ©  Shirley Burchill

 

 

 

PRACTICAL WORK

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Seed Structure

A. Take a seed that has been soaked in water for four hours and gently ease it open without disturbing the inside structures. Observe these structures using a binocular microscope. The outside structure of the seed has already been drawn and labelled for you. Now draw the inside structure of the seed and using the following labels.

Seed coat, food store (cotyledons), root (radicle), shoot (plumule)

 

Space for your drawing

 

 

 

 

 

 

 

 

 

B. Now remove the seed coat from one half of the seed. Add to the seed, three drops of iodine solution. What do you observe?

This is a positive test for a complex sugar called starch. It is the food store for the seed.

C. Now cut open the storage organs and put three drops of iodine solution onto a part that you have cut open. What do you observe?

What do these storage organs contain?

 

Conclusion

Seeds and storage organs contain food to allow the plant to start to grow again the following spring.

 

 

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