MODEL PAPER 2 — BIOLOGY STD 11 Science — Question

A section of root nodule of chick-pea plant appears pink,

1. Name the pigment, responsible for pink colour.
2. What is the role of this pigment in the nodule formation?
3. Explain the process of biological nitrogen-fixation in the root nodules in short.

Draw a labelled diagram of human urinary system.

Mango and coconut are ‘drupe’ type of fruits. In mango fleshy mesocarp is edible. What is the edible part of coconut? What does milk of tender coconut represent?

Do different species of plants growing in the same area show the same rate of transpiration at a particular time? Justify your answer.

Write the differences between: Systole and Diastole.

How are viroids different from viruses?

In the biology class, one of the student named Atul asked the importance of biologicalclassification. The biology teacher explained that it was required by the taxonomists for the better understanding of living world in systematic and simplest manner.

1. Explain the term biological classification.
2. What is its need?
3. What are the objectives of biological classification?
4. What are the values shown by Atul?

Proteins have been called 'biological polymers'.Explain.

You have heard about several insectivorous plants that feed on insects. Nepenthes or the pitcher plant is one such example, which usually grows in shallow water or in marsh lands. What part of the plant is modified into a ‘pitcher’? How does this modification help the plant for food even though it can photosynthesize like any other green plant?

1. Give the key features of metaphase and anaphase of mitosis. Also, draw diagrams of these stages.
2. Write the name of the stages of cell division, which is best to study the morphology of a chromosome.