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Published on: 12/06/2021
QB365 provides detailed and simple solution for every Book back Questions in class 10 Science Subject. It will helps to get more idea about question pattern in every book back questions with solution.
Download Tamil Nadu 10th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
Where are estrogens produced? What is the role of estrogens in the human body?
2.
Describe an experiment which demonstrates that growth stimulating hormone is produced at the tip of coleoptile.
3.
Susan’s father feels very tired and frequently urinates. After clinical diagnosis he was advised to take an injection daily to maintain his blood glucose level. What would be the possible cause for this? Suggest preventive measures.
4.
Senthil has high blood pressure, protruded eyeball and an increased body temperature. Name the endocrine gland involved and hormone secretion responsible for this condition.
5.
What would be expected to happen if
a) Gibberellin is applied to rice seedlings.
b) A rotten fruit gets mixed with unripe fruits.
c) When cytokinin is not added to culture medium
1.
Estrogen is produced by the Graafian follicles of the ovary,
Role of Estrogens in the human body:
(i) It brings about the changes that occur during puberty.
(ii) It initiates the process of oogenesis.
(iii) It stimulates the maturation of ovarian follicles in the ovary.
(iv) It promotes the development of secondary sexual characters (breast development, high pitched voice etc).
2.
(i) Warmolt Went (1903 -1990), a Dutch biologist demonstrated the existence and effect of auxin in plants.
(ii) He did a series of experiments in Avena coleoptiles.
First Experiment:
(i) In his first experiment he removed the tips of Avena coleoptiles.
(ii) The cut tips did not grow indicating that the tips produced something essential for growth.
Second Experiment:
(i) In his second experiment he placed the agar blocks on the decapitated coleoptile tips.
(ii) The coleoptile tips did not show any response.
Third Experiment:
(i) In his next experiment he placed the detached coleoptile tips on agar blocks.
(ii) After an hour, he discarded the tips and placed this agar block on the decapitated coleoptile.
(iii) It grew straight up indicating that some chemical had diffused from the cut coleoptile tips into the agar block which stimulated the growth.
Conclusion:
(i) He concluded that a chemical diffusing from the tip of coleoptiles was responsible for growth.
(ii) He named it as "Auxin" meaning "to grow".
3.
(i) Polyuria occurs in people diagnosed with Diabetes mellitus, if blood glucose levels have risen too high.
(ii) Regular exercise, along with a good diet, can reduce the risk of diabetes.
4.
(i) Hyperthyroidism is caused due to the excess secretion of the thyroid hormones which leads to Grave's disease.
(ii) This hormone is secreted by the thyroid gland.
5.
a) When Gibberellin is applied to rice seedlings, it would induce bolting. It is a natural attempt to boost seed production.
b) When a rotten fruit gets mixed with unripe fruits, the ethylene produced from the rotten fruits will hasten the ripening of the unripe fruits.
c) When cytokinin is not added to culture medium, then cell division, growth and differentiation will not be observed.
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
