NCERT Solutions for class 11 Biology Chapter 22: Chemical Coordination and Integration

Content Curator

NCERT Solutions for Class 11 Biology Chapter 22 Chemical Coordination and Integration are provided in the article below. It includes all the important definitions, concepts, and methodologies that will be really beneficial for the students. The important topics that are included in this chapter are:

Endocrine glands and hormones
Human endocrine system
Role of hormones as messengers and regulators, hypo – and hyperactivity and related disorders
Dwarfism, acromegaly, cretinism, goiter, exophthalmic goiter, diabetes, Addison’s disease.

Expected no. of Questions: 2 questions of around 2-3 marks.

Download PDF: NCERT Solutions for Class 11 Biology Chapter 22 Chemical Coordination and Integration

NCERT Solutions for Class 11 Biology Chapter 22

Class 11 Biology Chapter 22 Chemical Coordination and Integration: Important Topics

Everything on this earthworks in coordination with some other thing, whether it’s a heavy vehicle, any electronic device, or a Human Body. Our Bodies from inside to outside are inter-connected and coordinate with each other to work. What if someday you get a heart attack? What if someday u are unable to hear, speak, run, sense? What if you get collapsed someday during School assembly? This all happens because our body is internally chemically coordinated, and due to many reasons the coordination gets fails, and you fall ill. So, chemical coordination and integration are very much necessary. Good food, regular exercise, timely medical check-ups, and a healthy hygienic lifestyle will add value to your body’s coordination.

Endocrine glands and hormones

The endocrine glands in animals are the hypothalamus, the pituitary gland, the pineal gland, the thyroid, the parathyroid, the thymus, the pancreas, the adrenal gland, and the gonads.

Different endocrine glands along with the hormone they release are given below:

Hypothalamus- The hypothalamus secretes various releasing hormones like gonadotropin-releasing hormones, growth-hormone-releasing hormones.
Pituitary Gland- Hormones released by this gland are growth hormone, thyroid-stimulating hormone, LH, FSH etc.
Pineal Gland- It releases the hormone called melatonin.
Thyroid Gland- It releases the hormones triiodothyronine (T3) and thyroxine (T4).
Parathyroid Gland- The hormone released by this gland is parathormone.
Pancreas- The pancreas secretes hormones like glucagon, and insulin and these two balance the blood sugar level in the body.
Adrenal glands- The cortex region secretes the hormones cortisol, aldosterone, and androgens while the medulla region secretes the hormones adrenaline and noradrenaline.
Gonads- secretes the hormone testosterone.

Chapter Related Links:

Mechanism Of Hormone Action	Symptoms of Thyroid	Pituitary Gland
Goiter	Thyroid Glands	Endocrine Glands
Luteinizing Hormone	Thyroid Cancer	Gonads

CBSE Class 11 Biology Study Guides:

CBSE Class 11 Biology Syllabus	CBSE Class 11 Biology NCERT Textbook	CBSE Class 11 Biology Sample Paper
Biology Study Material	Biology MCQs	Difference between in Biology

CBSE CLASS XII Related Questions

1.
Write the composition of intine and exine layers of a pollen grain.
View Solution
2.
Gregor Mendel conducted hybridisation experiments in garden pea for seven years and proposed the law of inheritance.
Why was he successful in his hybridisation experiments? Give two reasons.
State the law of independent assortment as proposed by Mendel after his dihybrid crosses.
View Solution
3.
Student to attempt either option-(A) or (B):
(A) Write the features a molecule should have to act as a genetic material. In the light of the above features, evaluate and justify the suitability of the molecule that is preferred as an ideal genetic material.
OR
(B) Differentiate between the following:
- [(i)] Polygenic Inheritance and Pleiotropy
- [(ii)] Dominance, Codominance and Incomplete dominance
View Solution
4.
Student to attempt either option (A) or (B).
(A)
(i) Describe the process of megasporogenesis in an angiosperm.
(ii) Draw a diagram of a mature embryo sac of the angiosperm. Label its any four parts.
OR
(B) The reproductive cycle in the female primates is called menstrual cycle. The first menstruation begins at puberty.
Answer the following questions:
(i) Name the four phases of menstrual cycle in a proper sequence.
(ii) How long does the menstrual phase last in a menstrual cycle?
(iii) When and why hormones estrogen and progesterone reach their peak levels respectively, in the menstrual cycle?
(iv) Give the significance of LH surge.
View Solution
5.
If a natural population of 60 individuals is in Hardy-Weinberg equilibrium for a gene with two alleles B and b, with the gene frequency of allele B of 0.7, the genotype frequency of Bb will be:
- ( 0.21 )
- ( 0.42 )
- ( 0.49 )
- ( 0.56 )
View Solution
6.
Observe the given sequence of nitrogenous bases on a DNA fragment and answer the following questions:

(a) Name the restriction enzyme which can recognise the DNA sequence.
(b) Write the sequence after restriction enzyme cut the palindrome.
(c) Why are the ends generated after digestion called as ‘Sticky Ends’?
View Solution