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

Give one basic functional difference between phellogen and phelloderm.

Arrange the following in the sequence you would find them in a plant starting from the periphery – phellem, phellogen, phelloderm.

If one debarks a tree, what parts of the plant is being removed?

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.

Mark the mismatched pair.