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Published on: 13/05/2022
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Questions + Answers key
Take MCQ Science Test1.
Which hormone requires iodine for its formation? What will happen if intake of iodine in our diet is low?
2.
What are the hormones secreted by posterior lobe of the pituitary gland? Mention the tissues on which they exert their effect.
3.
Write the differences between endocrine and exocrine gland.
4.
What will you do to prevent leaf fall and fruit drop in plants? Support your answer with reason.
5.
What is bolting? How can it be induced artificially?
1.
(i) Iodine is involved in the formation of thyroid hormone.
(ii) Goitre is caused due to the inadequate supply of iodine in our diet.
2.
The hormones secreted by the posterior pituitary are:
Vasopressin or Antidiuretic hormone (ADH)
In kidney tubules it increases reabsorption of water.
Oxytocin
It helps in the contraction of the smooth muscles of uterus
3.
| S.No | Endocrine Gland | Exocrine Gland |
|---|---|---|
| I) | They are ductless glands. | These glands are with specific ducts. |
| II) | Secretions are directly diffused into the blood stream. | Secretions are passed through the specific ducts |
| III) | Secreate hormones. | Secreate saliva, sweat, etc |
| IV) | E.g: Pituitary gland, thyroid gland. | E.g: Salivary glands, sweat glands. |
4.
Application of auxin on plants will prevent leaf fall and fruit drop in plants because Auxins prevent the formation of abscission layer.
5.
(i) Bolting is production of a flowering stem in plants.
(ii) Treatment of rosette plants with gibberellin induces sudden shoot elongation followed by flowering. This is called bolting.
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
