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

Organisms living in salty areas are called as ______.

What is the principle underlying the use of cyanobacteria in agricultural fields for crop improvement?

Make a list of algae and fungi that have commercial value as source of food, chemicals, medicines and fodder.

In Opuntia the stem is modified into a flattened green structure to perform the function of leaves (i.e., photosynthesis). Cite two other examples of modifications of plant parts for the purpose of photosynthesis.

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

Colocasia ______.

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

Potato ______.

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

Turmeric ______.

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

Gladiolus ______.

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

Ginger ______.

Tendrils are found in the following plants. Identify whether they are stem tendrils or leaf tendrils.

Cucumber

Tendrils are found in the following plants. Identify whether they are stem tendrils or leaf tendrils.

Pumpkins

Tendrils are found in the following plants. Identify whether they are stem tendrils or leaf tendrils.

Grapevine

Tendrils are found in the following plants. Identify whether they are stem tendrils or leaf tendrils.

Watermelons

Tendrils of grapevines are homologous to the tendril of pumpkins but are analogous to that of pea. Justify the above statement.

Describe various stem modifications associated with food storage, climbing and protection.

Stolon, offset and rhizome are different forms of stem modifications. How can these modified forms of stem be distinguished from each other?

Seeds of some plants germinate immediately after shedding from the plants while in other plants they require a period of rest before germination. The later phenomena is called as dormancy. Give the reasons for seed dormancy and some methods to break it.

Match the followings and choose the correct option from below

Cells of this tissue are living and show angular wall thickening. They also provide mechanical support. The tissue is ______.

In which of the following pairs of parts of a flowering plant is epidermis absent?