1. HQ- Chap. 30-31

2. 1- Which of the following shows the correct sequence? A. Pituitary  thyroxine  thyroid  TSH B. Pituitary  TSH  thyroid  thyroxine C. TSH  thyroxine  pituitary  thyroid D. Thyroid  TSH  thyroxine  pituitary

3. 2- In humans, vitamin D plays an essential role in the absorbtion of which substance?

4. 3- which plant growth substance promotes the growth of buds?

5. 4- Name and element other than nitrogen which deficiency results in yellow leaves?

6. 5. Name the chemicalthat has an inhibitory effect on the action of many enzymes

7. 6- Which two drugs result in the birth of children of smaller size?

8. 7- Give three reasons why calcium is needed by humans?

9. 8. What is the name given to the movement of plants as a result of uneven light exposure?

10. 9- Where is α- amylase synthesised in the barley seed?

11. 10- what is the name of the part of the barley seed which acts as a food reserve?

12. Answers 1-B 2- Calcium 3- Gibelleric acid 4- Magnesium 5- Lead 6- Nicotine, alcohol 7- for bones, teeth and clotting of blood 8- phototropism 9- Aleurone layer 10- Endosperm