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

Roots obtain oxygen from air in the soil for respiration. In the absence or deficiency of O₂, root growth is restricted or completely stopped. How do the plants growing in marshlands or swamps obtain their O2 required for root respiration?

In swampy areas like the Sunderbans in West Bengal, plants bear special kind of roots called ______.

In aquatic plants like Pistia and Eichhornia, leaves and roots are found near ______.

Name the body part modified for food storage in the following:

Carrot ______.

Name the body part modified for food storage in the following:

Sweet potato ______.

Name the body part modified for food storage in the following:

Asparagus ______.

Name the body part modified for food storage in the following:

Radish ______.

Name the body part modified for food storage in the following:

Dahlia ______.

Name the body part modified for food storage in the following:

Portulaca ______.

Give two examples of roots that develop from different parts of the angiospermic plant other than the radicle.

The essential functions of roots are anchorage and absorption of water and minerals in the terrestrial plant. What functions are associated with the roots of aquatic plants. How are roots of aquatic plants and terrestrial plants different?

Rhizome of ginger is like the roots of other plants that grows underground. Despite this fact ginger is a stem and not a root. Justify.

Which one of the following types of cell is involved in making of the inner walls of blood vessels?

Name the different cell junctions found in tissues.

The body of sponges does not possess tissue level of organisation though it is made of thousands of cells. Comment.

Stratified epithelial cells have limited role in secretion. Justify their role in our skin.

How does a gap junction facilitate intercellular communication?

Write the appropriate type of tissues in column B according to the functions mentioned in column A.

Classify and describe epithelial tissue on the basis of structural modifications of cells.

Is rubber a primary metabolite or a secondary metabolite? Write four sentences about rubber.