Science (English Medium) Class 11 - CBSE Question Bank Solutions for Biology

Explain the advantage of the complete partition of ventricle among birds and mammals and hence leading to double circulation.

What is the significance of hepatic portal system in the circulatory system?

Describe the events in cardiac cycle. Explain “double circulation”.

Which of the following is removed from our body by lungs?

Name atleast two hormones which result in fluctuation of Ca⁺⁺ level.

Mark the vitamin present in Rhodopsin ______.

Human eyeball consists of three layers and it encloses ______.

Label the following parts in the given diagram using arrow.

1. Aqueous chamber
2. Cornea
3. Lens
4. Retina
5. Vitreous chamber
6. Blind spot

Mary is about to face an interview. But during the first five minutes before the interview she experiences sweating, increased rate of heart beat, respiration etc. Which of the following hormones are responsible for her restlessness?

The steroid responsible for balance of water and electrolytes in our body is ______.

Cortisol is secreted by ______.

Choose the correct option among the following options

Which of the two adrenocortical layers, zona glomerulosa and zona reticularis lies outside enveloping the other?

Correct the following statement by replacing the term underlined.

Tetraiodothyronine is an emergency hormone.

List the hormones secreted by the following:

Adrenal

Describe briefly the four major groups of Protozoa.

What are the characteristic features of Euglenoids?

Differentiate between the following

syngamy and triple fusion

How would you distinguish monocots from dicots?

Explain the structure of stomata with a labelled diagram.