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

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.

It is known that exposure to carbon monoxide is harmful to animals because ______.

Mark the incorrect statement in context to O₂ binding to Hb

The oxygen-haemoglobin dissociation curve will show a right shift in case of ______.

What is the amount of O₂ supplied to tissues through every 100 ml. of oxygenated blood under normal physiological conditions?

Explain the transport of O₂ and CO₂ between alveoli and tissue with diagram.

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 ______.