11.

Viroids have

• single stranded RNA not enclosed by protein coat

• single stranded DNA not enclosed by protein coat

• double stranded DNA enclosed by protein coat

• double stranded RNA enclosed by protein coat

Hill reaction occurs in:

• high altitude plants

• total darkness

• absence of water

• presence of ferricyanide

Which one of the following pairs is correctly matched?

• Rhizobium - Parasite in the roots of leguminous plants

• Mycorrhizae - Mineral uptake from soil

• Yeast - Production of biogas

• Myxomycetes - The disease ring worm

Plasmodesmata connections help in

• cytoplasmic streaming

• synchronous mitotic divisions

• locomotion of unicellular organism

• movement of substances between cells

The quiescent centre in root meristem serves as a

• site for storage of food which is utilized during maturation

• reservoir of growth hormones

• reserve for replenishment of damaged cells of the meristem

• region for absorption of water

Azolla is used as a biofertilizer because it

• multiplies very fast to produce massive biomass

• has association of nitrogen - fixing Rhizobium

• has association of nitrogen - fixing cyanobacteria

• has association of mycorrhiza

Assertion : Smaller the organism higher is the rate of metabolism per gram weight.

Reason : The heart rate of a six month old baby is much higher than that of an old person.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

Assertion : Severe Acute Respiratory Syndrome (SARS) originated in China.

Reason : China is the most populated country of the world.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

Assertion : A cell membrane shows fluid behaviour.

Reason : A membrane is a mosaic or compositeof diverse lipids and proteins.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements

Assertion : Rhoeo leaves contain anthocyanin pigments in epidermal cells.

Reason : Anthocyanins photosynthetic pigments.

• If both Assertion and Reason are true and the reason is the correct explanation of the assertion

• If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

• If Assertion is true statement but Reason is false

• If both Assertion and Reason are false statements