1. HQ4-Chap.31-32

2. 1- What is the element required for amino acid synthesis?

3. 2- Which element is a component of chlorophyll?

4. 3-Which element is missing when leaf are dying prematurely?

5. 4-Which elements are missing when plants develop red leaf bases?

6. 5-Which element results in anemia when in shortage?

7. 6-Which drug result in limb deformities when taken during pregnancy?

8. 7- A plant which needs a minimum number of hours of darkness (or more) to flower is called what?

9. 8- Example of a long day plant.

10. 9- What is the name given to plants which grow in the absence of light

11. 10- How does the length of daylight affect the biology of mammals?

12. 1- Nitrogen 2- Magnesium 3- Potassium 4- Phosphorus and nitrogen 5- Iron 6- Thalidomide 7- Short day plant 8- Spinach 9- Etiolation 10- Gonad development