Reproduction cannot be the defining characteristic of living organisms.Justify.

2

(a)

A plants may have different names in different regions of the country or world. How do botanists solve this problem?

2

(a)

All the organisms are not yet identified on the earth.Justify the statement.

2

(a)

How do fungi form partnership with most plants?

2

(a)

What is the characteristic feature of class-Ascomycetes?

2

(a)

On which criteria is chemotaxonomy based ?Can it be used for classification?

2

(a)

Natural system of classification is considered better than artifiicial system of classification. Explain.

2

(a)

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

2

(a)

Why Peripatus is called a connecting link between annelids and arthropods?

2

(a)

How will you show the monocarpellary and unilocular condition of gynoecium of Lathrus odoratus (sweet pea)?

2

(a)

Why the scientists decalcify the bones?

2

(a)

Multicellular organisms have division of labour. Explain.

2

(a)

Why do doctors recommend vegetable oils with polyunsaturated fatty acids for persons suffering from cardiovascular disease?

2

(a)

What are gums made of? Is Fevicol different?

2

(a)

Why is living state a non-equilibrium steady-state?

2

(a)

Starch, cellulose, glycogen, chitin are polysaccharides. From the options below, choose the one appropriate and write against each.
Cotton fibre_____________.
Exoskeleton of cockroach______________.
Liver_____________.
Peeled potato_____________.

2

(a)

How would you analyse that the cell's entire energy is devoted to the process of division in the M-phase?

2

(a)

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

2

(a)

if fifty per cent of the leaves are removed from a plant, the rate of transpiration by the remaining leaves increase. Explain.

2

(a)

Explain the significance of saltatory conduction.

2

(a)

Which of them shows higher relative growth rate?Justify.

2

(a)

Bile juice contains no digestive enzymes, yet it is important for digestion.Why?

2

(a)

What happens to the respiratory process in a man going up a hill?

2

(a)

Why is swelling of feet or leg caused when a person stands immobile for a long time?

2

(a)

(i) Name two surface extensions that are not concerned with motility in bacterial cells.
(ii) Give the name of the structure that helps in motility of bacterial cells.

2

(a)