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Published on: 25/10/2019
Plant and Animal Hormones
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.
LH is secreted by
Adrenal gland
Thyroid gland
Anterior pituitary
Hypothalamus.
2.
To increase the sugar production in sugarcanes they are sprayed with _______
Auxin
Cytokinin
Gibberellins
Ethylene
3.
Avena coleoptile test was conducted by
Darwin
N. Smit
Paal
F.W. Went
4.
Which one of the following hormones is naturally not found in plants.
2, 4-D
GA3
Gibberellin
IAA
5.
The hormone which has positive effect on apical dominance is:
Cytokinin
Auxin
Gibberellin
Ethylene
6.
Name the endocrine glands associated with kidneys.
7.
Name the hormones which regulates water and mineral metabolism in man.
8.
What is the hormone responsible for the secretion of milk in female after child birth?
9.
Write the name of a synthetic auxin.
10.
Which hormone promotes the production of male flowers in Cucurbits?
11.
Which hormone requires iodine for its formation? What will happen if intake of iodine in our diet is low?
12.
What is the role of parathormone?
13.
Write the differences between endocrine and exocrine gland.
14.
What are chemical messengers?
15.
Write the physiological effects of gibberellins.
16.
Ovary
17.
Leydig cells
18.
ADH
19.
Parathormone
20.
Thyroxine
21.
______ is also known as ADH.
22.
______ is a hormone produced by the pineal gland.
23.
The posterior pituitary is also called ______
24.
_____ is the cytokinin got form maize (Zea mays).
25.
______ are called chemical messengers.
1.
(c)
Anterior pituitary
2.
(c)
Gibberellins
3.
(d)
F.W. Went
4.
(a)
2, 4-D
5.
(b)
Auxin
6.
Posterior lobe (Neurohypophysis) of pituitary gland.
7.
Growth hormone, Thyroid hormone, Parathormone and Glucocorticoids.
8.
Prolactin (PRL) is also called lactogenic hormone, initiates development of mammary glands during pregnancy and stimulates the production of milk after child birth.
9.
2,4 - Dichlorophenoxy Acetic acid ( (2,4 - D)
10.
Gibberellin promote the production of male flowers in Cucurbits.
11.
(i) Iodine is involved in the formation of thyroid hormone.
(ii) Goitre is caused due to the inadequate supply of iodine in our diet.
12.
(i) The parathormone regulates calcium and phosphorus metabolism in the body.
(ii) They act on bone, kidney and intestine to maintain blood calcium levels.
13.
| 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. |
14.
(i) A chemical messenger is any compound that serves to transmit a message.
(ii) Hormones act as chemical messengers which are produced by specialized glands.
15.
(i) Application of gibberellins on plants stimulate extraordinary elongation of internode. E.g: Corn and Pea.
(ii) Treatment of rosette plants with gibberellin induces sudden shoot elongation followed by flowering. This is called bolting.
(iii) Gibberellins promote the production of male flowers in monoecious plants (Cucurbits).
(iv) Gibberellins break dormancy of Potato tubers.
(v) Gibberellins are efficient than auxins in inducing the formation of seedless fruit - Parthenocarpic fruits (Development of fruits without fertilization) E.g: Tomato.
16.
Secrete the female sex hormones.
17.
Testes
18.
Diabetes insipidus
19.
Tetany
20.
Simple goitre
21.
( )
Vasopressin
22.
( )
Melatonin
23.
( )
neurohypophysis
24.
( )
Zeatin
25.
( )
Hormones
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
