11th Zoology - Book Back Answers - Unit 11 - English Medium Guides

 

 

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Tamil Nadu Board 11th Standard Zoology - Unit 11: Book Back Answers and Solutions

    This post covers the book back answers and solutions for Unit 11 – Zoology from the Tamil Nadu State Board 11th Standard Zoology textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.

    We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.

    By going through this material, you’ll gain a strong understanding of Zoology  Unit 11 along with the corresponding book back questions and answers (PDF format).

Question Types Covered:

• 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following 
• 2 Mark Questions: Answer briefly 
• 3, 4, and 5 Mark Questions: Answer in detail

All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.

All the best, Class 11 students! Prepare well and aim for top scores. Thank you!

Unit 11: Chemical Coordination and Integration

I. Multiple Choice Questions

1. The maintenance of constant internal environment is referred as
a. Regulation
b. homeostasis
c. co-ordination
d. hormonal control
Answer Key:
b. homeostasis

2. Which of the following are exclusive endocrine glands?
a. Thymus and testis
b. adrenal and ovary
c. parathyroid and adrenal
d. pancreas and parathyroid
Answer Key:
c. parathyroid and adrenal

3. Which of the following hormone is not secreted under the influence of pituitary gland?
a. thyroxine
b. insulin
c. oestrogen
d. glucocorticoids
Answer Key:
b. insulin

4. Spermatogenesis in mammalian testes is controlled by
a. Luteinising hormone
b. Follicle stimulating hormone
c. FSH and prolactin
d. GH and prolactin
Answer Key:
a. Luteinising hormone

5. Serum calcium level is regulated by
a. Thyroxine
b. FSH
c. Pancreas
d. Thyroid and parathyroid
Answer Key:
d. Thyroid and parathyroid

6. Iodised salt is essential to prevent
a. rickets
b. scurvy
c. goitre
d. acromegaly
Answer Key:
c. goitre

7. Which of the following gland is related with immunity?
a. Pineal gland
b. adrenal gland
c. thymus
d. parathyroid gland
Answer Key:
c. thymus

8. Which of the following statement about sex hormones is correct?
a. Testosterone is produced by Leydig cells under the influence of luteinizing hormone
b. Progesterone is secreted by corpus luteum and softens pelvic ligaments during child birth
c. Oestrogen is secreted by both sertoli cells and corpus luteum
d. Progesterone produced by corpus luteum is biologically different from the one produced by placenta.
Answer Key:
a. Testosterone is produced by Leydig cells under the influence of luteinizing hormone

9. Hypersecretion of GH in children leads to
a. Cretinism
b. Gigantism
c. Graves disease
d. Tetany
Answer Key:
b. Gigantism

10. A pregnant female delivers a baby who suffers from stunted growth, mental retardation, low intelligence quotient and abnormal skin. This is the result of
a. Low secretion of growth hormone
b. Cancer of the thyroid gland
c. Over secretion of pars distalis
d. Deficiency of iodine in diet.
Answer Key:
a. Low secretion of growth hormone

11. The structure which connects the hypothalamus with anterior lobe of pituitary gland is the
a. Dendrites of neuro hypophysis
b. Axons of neurohypophysis
c. Bands of white fibers from cerebellar region
d. Hypophyseal portal system
Answer Key:
d. Hypophyseal portal system

12. Which one of the following statement is correct
a. Calcitonin and thymosin are thyroid hormones
b. Pepsin and prolactin are secreted in stomach
c. Secretin and rhodopsin are polypeptide hormones
d. Cortisol and aldosterone are steroid hormones
Answer Key:
d. Cortisol and aldosterone are steroid hormones

13. which of the given option shows all wrong statements for thyroid gland
Statements
(i) It inhibits process of RBC formation
(ii) It helps in maintenance of water and electrolytes
(iii) Its more secretion can reduce blood pressure
(iv) It Stimulates osteoblast
(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iv)
(d) (i) and (iii)
Answer Key:
(d) (i) and (iii)

 

II. Short answer questions

a

III. Long answer questions

a

IV. Exercise

a