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

Reaction given below is catalysed by oxidoreductase between two substrates A and A’, complete the reaction.

A reduced + A’ oxidised `→`

The C₄ plants are twice as efficient as C₃ plants in terms of fixing CO₂ but lose only ______ as much water as C₃ plants for the same amount of CO₂ fixed.

In a girdled plant, when water is supplied to the leaves above the girdle, leaves may remain green for sometime then wilt and ultimately die. What does it indicate?

Give a comparative account of the classes of Kingdom Fungi under the following:

1. Mode of nutrition
2. Mode of reproduction

Describe the internal structure of a dorsiventral leaf with the help of labelled diagrams.

What essential role does the root endodermis play during mineral absorption in plants?

Explain why xylem transport is unidirectional and phloem transport bi-directional.

Which of the following is not a function of cytoskeleton in a cell?

Members of phycomycetes are found in ______.

1. Aquatic habitats
2. On decaying wood
3. Moist and damp places
4. As obligate parasites on plants

Choose from the following options

Neurospora - an ascomycetes fungus has been used as a biological tool to understand the mechanism of plant genetics much in the same way as Drosophila has been used to study animal genetics. What makes Neurospora so important as a genetic tool?

At a stage of their cycle, ascomycetes fungi produce the fruiting bodies like apothecium, perithecium or cleistothecium. How are these three types of fruiting bodies different from each other?

Give one example each for an animal possessing placoid scales and that with cycloid scales.

Write one example the following in the space provided.

Cold blooded animal ______.

Give an example of the following:

Fish possessing poison sting

Give the characteristic features of the following citing one example.

Chondrichthyes and ostichthyes

Name

A cold blooded animal

Give an example for the following:

A fish possessing a poison sting

Give an example for the following:

A fish possessing an electric organ 

How are prosthetic groups different from co-factors?

Cut pieces of beetroot do not leave colour in cold water but do so in hot water. Explain.