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Understanding Hormonal Regulation and Plant Growth Substances

This comprehensive overview touches on key concepts in biology, including the relationship between the pituitary gland and thyroid function via TSH and thyroxine secretion. It highlights the crucial role of vitamin D in calcium absorption, discusses plant hormones like gibberellins, and explores the impact of certain drugs on fetal growth. Furthermore, it examines the importance of calcium for human health and details the phenomena of phototropism in plants. Essential terms and functions in plant biology, along with nutritional aspects, are also covered.

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Understanding Hormonal Regulation and Plant Growth Substances

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  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

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