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

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.

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

Sternum is present on the ventral side of the body.

Write the difference between Pectoral and Pelvic girdle.

All mammals (except a few) have ______ cervical vertebra.

The number of phalanges in each limb of human is ______. 

______ and ______ pairs of ribs are called floating ribs.

The human cranium is made of ______ bones.

In an inflorescence where flowers are borne laterally in an acropetal succession, the position of the youngest floral bud in the floral axis shall be ______.

Are chemosynthetic bacteria-autotrophic or heterotrophic?

Holdfast, stipe and frond constitutes the plant body in case of ______.

Food is stored as Floridean starch in Rhodophyceae. Mannitol is the reserve food material of which group of algae?

Product of photosynthesis is transported from the leaves to various parts of the plants and stored in some cell before being utilised. What are the cells/ tissues that store them?

While eating peach or pear it is usually seen that some stone like structures get entangled in the teeth, what are these stone like structures called?

Below is a list of plant fibres. From which part of the plant these are obtained

Coir

Write the function of:

Collenchyma

Write the function of:

Aerenchyma