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

Why are neurons called excitable cells? Mention special features of the membrane of the neuron?

Match the element with its associated functions/roles and choose the correct option among given below

Plants can be grown in ______. (Tick the incorrect option)

Plants with zinc deficiency show reduced biosynthesis of ______.

Yellowish edges appear in leaves deficient in ______ mineral.

Excess of Mn in soil leads to defeciency of Ca, Mg and Fe. Explain.

How is sulphur important for plants? Name the aminoacids in which it is present.

In which part of alimentary canal does absorption of water, simple sugars and alcohol takes place?

Correct the statement given below by the right option shown in the bracket against them.

Absorption of amino acids and glycerol takes place in the. (small intestine/ large intestine)

Correct the statement given below by the right option shown in the bracket against them.

The faeces in the rectum initiate a reflex causing an urge for its removal. (neural/hormonal)

Discuss mechanisms of absorption.

Name the primary site of exchange of gases in our body?

Compared to O₂, diffusion rate of CO₂ through the diffusion membrane per unit difference in partial pressure is much higher. Explain.

Which of the following statements is correct?

Which one of the following is also known as antidiuretic hormone?

The following abbreviations are used in the context of excretory functions, what do they stand for?

ANF

The following abbreviations are used in the context of excretory functions, what do they stand for?

ADH

What is the role played by Renin-Angiotensin in the regulation of kidney function?

Comment upon the hormonal regulation of selective reabsorption.

Exchange of calcium between bone and extracellular fluid takes place under the influence of certain hormones. What will happen if more of Ca⁺⁺ is in extracellular fluid?