Science (English Medium) इयत्ता ११ - CBSE Question Bank Solutions for Biology

Our reaction like aggressive behaviour, use of abusive words, restlessness etc. are regulated by brain, name the parts involved.

What do grey and white matter in the brain represent?

Where is the hunger centre located in human brain?

Name the parts of human forebrain indicating their respective functions.

Which of the following conditions is not linked to deficiency of thyroid hormones?

Name the only hormone secreted by pars intermedia of the pituitary gland.

State whether true or false:

Pars distalis produces six trophic hormones.

A patient complains of constant thirst, excessive passing of urine and low blood pressure. When the doctor checked the patients’ blood glucose and blood insulin level, the level were normal or slightly low. The doctor diagnosed the condition as diabetes insupidus. But he decided to measure one more hormone in patients blood. Which hormone does the doctor intend to measure?

Correct the following statement by replacing the term underlined.

TSH is secreted from the corpus luteum.

What is the role-played by luteinizing hormones in males and females respectively?

Inflammatory responses can be controlled by a certain steroid. Name the steroid, its source and also its other important functions.

You have learnt that a characteristic feature of endocrine system is the presence of feed back loops. By this what is meant if hormone A stimulates gland ‘X’ to secrete hormone B, the production of ‘A’ could be modified when the level of B changes in our blood. An example is the relation between hormones LH and estrogen (E2). An old woman exhibits the following features. High levels of LH in blood but low levels of E2 in the blood. Another woman exhibits high level of LH in blood and also high level of E2 in the blood. Where is the defect in both these women? Provide suitable diagram to support this answer.

A milkman is very upset one morning as his cow refuses to give any milk. The milkman’s wife gets the calf from the shed. On fondling by the calf, the cow gave sufficient milk. Describe the role of endocrine gland and pathway associated with this response?

Illustrate the differences between the mechanism of action of a protein and a steroid hormone.

Hypothalamus is a super master endocrine gland. Elaborate.

List the hormones secreted by the following:

Pituitary

Write a short note on the function of the following hormone:

Androgens

Define a taxon.

What are the peculiar features that you find in parasitic platyhelminthes?

Water vascular system is the characteristic of which group of the following: