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

Seeds of some plants germinate immediately after shedding from the plants while in other plants they require a period of rest before germination. The later phenomena is called as dormancy. Give the reasons for seed dormancy and some methods to break it.

Match the followings and choose the correct option from below

Cells of this tissue are living and show angular wall thickening. They also provide mechanical support. The tissue is ______.

In which of the following pairs of parts of a flowering plant is epidermis absent?

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

Enzymes are biocatalysts. They catalyse biochemical reactions. In general they reduce activation energy of reactions. Many physico-chemical processes are enzyme mediated. Which of the following reactions is not engyme-mediated in biological system?

Select an appropriate chemical bond among ester bond, glycosidic bond, peptide bond and hydrogen bond and write against the following.

Protein ______

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.

Match the terms given under Column ‘A’ with their functions given under Column ‘B’ and select the answer from the options given below: