Science (English Medium) कक्षा ११ - CBSE Question Bank Solutions

Distinguish between the following: Septal nephridium and pharyngeal nephridium

Mention briefly about the circulatory system of earthworm

Mention the function of the following - Body wall in earthworm

Name at least five different deficiency symptoms in plants. Describe them and correlate them with the concerned mineral deficiency.

If a plant shows a symptom which could develop due to deficiency of more than one nutrient, how would you find out experimentally, the real deficient mineral element?

Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?

Define the term differentiation.

Define the term redifferentiation.

Define the term dedifferentiation. 

Define the term determinate growth.

Define the term meristem.

Both growth and differentiation in higher plants are open’. Comment.

Write the differences between open and closed system of circulation

Describe the evolutionary change in the pattern of heart among the vertebrates.

Sino-atrial node is called the pacemaker of our heart. Why?

What is the significance of atrio-ventricular node and atrio-ventricular bundle in the functioning of heart?

Micturition is carried out by a reflex.

Explain micturition.

Write true or false. If false change the statement so that it is true.

Human skeleton has 206 bones.

Write true or false. If false change the statement so that it is true.

There are 11 pairs of ribs in man.