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

What is common to Nepenthes, Utricularia and Drosera with regard to mode of nutrition?

Sketch and label the ‘Ultrastructure of Chloroplast’.

The transverse section of a plant material shows the following anatomical features, (a) the vascular bundles are conjoint, scattered and surrounded by sclerenchymatous bundle sheaths (b) phloem parenchyma is absent. What will you identify it as?

While eating watermelons, all of us wish it was seedless. As a plant physiologist can you suggest any method by which this can be achieved.

Algae are known to reproduce asexually by variety of spores under different environmental conditions. Name these spores and the conditions under which they are produced.

What is the epidermal cell modification in plants which prevents water loss?

What are the cells that make the leaves curl in plants during water stress?

Point out the differences in the anatomy of, leaf of peepal (Ficus religiosa) and maize (Zea mays). Draw the diagrams and label the differences.

Palm is a monocotyledonous plant, yet it increases in girth. Why and how?

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?