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Published on: 11/09/2019
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.
Which organ acts as both exocrine gland as well as endocrine gland
Pancreas
Kidney
Liver
Lungs
2.
Gibberellins cause:
Shortening of genetically tall plants
Elongation of dwarf plants
Promotion of rooting
Yellowing of young leaves
3.
Decreased secretion of thyroid hormones in the children leads to _________
4.
In the islets of Langerhans, beta cells secrete ________
5.
The hormone which has negative effect on apical dominance is _________.
6.
___________ is a gaseous hormone involved in abscission of organs and acceleration of fruit ripening.
7.
_______ causes cell elongation, apical dominance and prevents abscission.
8.
Name the endocrine glands associated with kidneys.
9.
What is the hormone responsible for the secretion of milk in female after child birth?
10.
Write the name of a synthetic auxin.
11.
What is the role of parathormone?
12.
Write the differences between endocrine and exocrine gland.
13.
What is bolting? How can it be induced artificially?
14.
ADH
15.
Growth hormone
16.
Parathormone
17.
Insulin
18.
Thyroxine
1.
(a)
Pancreas
2.
(b)
Elongation of dwarf plants
3.
( )
cretinism
4.
( )
insulin
5.
( )
cytokinins
6.
( )
Ethylene
7.
( )
Auxin
8.
Posterior lobe (Neurohypophysis) of pituitary gland.
9.
Prolactin (PRL) is also called lactogenic hormone, initiates development of mammary glands during pregnancy and stimulates the production of milk after child birth.
10.
2,4 - Dichlorophenoxy Acetic acid ( (2,4 - D)
11.
(i) The parathormone regulates calcium and phosphorus metabolism in the body.
(ii) They act on bone, kidney and intestine to maintain blood calcium levels.
12.
| 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. |
13.
(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.
14.
Diabetes insipidus
15.
Acromegaly
16.
Tetany
17.
Diabetes mellitus
18.
Simple goitre
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Tamilnadu Stateboard 10th Standard Subjects
Tamilnadu Stateboard Standards
