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

What is the commercial source of cork? How is it formed in the plant?

What is the difference between lenticels and stomata?

The form of sugar transported through phloem is ______.

In a plant, tranalocation in xylem is unidirectional while in phloem it is bidirectional. Explain.

If one wants to find minerals and in the form they are mobilised in the plant, how will an analysis of the exudate help?

What is the chemical composition of xylem and phloem sap?

When and where does reduction division take place in the life cycle of a liverwort, a moss, a fern, a gymnosperm and an angiosperm?

Both gymnosperms and angiosperms bear seeds, then why are they classified separately?

Explain pressure flow hypothesis of translocation of sugars in plants.

What is the fate of primary xylem in a dicot root showing extensive secondary growth?

Give an example of plants with

1. Haplontic life cycle
2. Diplontic life cycle
3. Haplo- diplontic life cycle

Most algal genera show haplontic life style. Name an alga which is

1. Haplo-diplontic
2. Diplontic

Comment on the lifecycle and nature of a fern prothallus.

With the help of a schematic diagram describe the haplo-diplontic life cycle pattern of a plant group.

With the help of a schematic diagram describe the haplo-diplontic life cycle pattern of a plant group.

Assume that a pencil box held in your hand, represents a plant cell. In how many possible planes can it be cut? Indicate these cuts with the help of line drawings.

Sugars are technically called carbohydrates, referring to the fact that their formulae are only multiple of C(H₂O). Hexoses therefore have six carbons, twelve hydrogens and six oxygen atoms. Glucose is a hexose. Choose from among the following another hexose.

Mark the mismatched pair.

Explain the mass flow hypothesis of transport in phloem.

What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?