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

What are plasmids? Describe their role in bacteria?

Is extra genomic DNA present in prokaryotes and eukaryotes? If yes, indicate their location in both the types of organisms.

The genomic content of the nucleus is constant for a given species where as the extra chromosomal DNA is found to be variable among the members of a population. Explain.

When you take cells or tissue pieces and grind them with an acid in a mortar and pestle, all the small biomolecules dissolve in the acid. Proteins, polysaccharides and nucleic acids are insoluble in mineral acid and get precipitated. The acid soluble compounds include aminoacids, nucleosides, small sugars etc. When one adds a phosphate group to a nucleoside, one gets another acid soluble biomolecule called ______.

Which one of the following statements can best explain the term critical concentration of an essential element?

Deficiency symptoms of an element tend to appear first in young leaves. It indicates that the element is relatively immobile. Which one of the following elemental deficiency would show such symptoms?

How are the terms ‘critical concentration’ and ‘deficient’ different from each other in terms of concentration of an essential element in plants? How will you find the values of ‘critical concentration’ and ‘deficient’ for minerals – Fe and Zn?

Carnivorous plants exhibit nutritional adaptation. Citing an example explain this fact.

It is observed that deficiency of a particular element showed its symptoms initially in older leaves and then in younger leaves.

1. Does it indicate that the element is actively mobilized or relatively immobile?
2. Name two elements which are highly mobile and two which are relatively immobile.
3. How is the aspect of mobility of elements important to horticulture and agriculture?

Splitting of water is associated with ______.

The entire process of photosynthesis consists of a number of reactions. Where in the cell do these take place?

Photolysis of water ______

Explain in 2-3 lines the following terms with the help of examples taken from different plant tissues.

Differentiation

Explain in 2-3 lines the following terms with the help of examples taken from different plant tissues.

De-differentiation

Explain in 2-3 lines the following terms with the help of examples taken from different plant tissues.

Redifferentiation

Which of the following is not a common disorder associated with digestive system?

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

Skin and eyes turn yellow in infection. (liver /stomach)

Distinguish between constipation and indigestion. Mention their major causes.

Which among the followings is correct during each cardiac cycle?

The cardiac impulse is initiated and conducted further upto ventricle. The correct sequence of conduction of impulse is ______.

Read the following statements and choose the correct option

Statement 1: Atria receive blood from all parts of the body which subsequently flows to ventricles.

Statement 2: Action potential generated at sino-atrial node passes from atria to ventricles.