Assertion: In angiosperms the conduction of water is more efficient because their xylem has vessels.

Reason: Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondria

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

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

• If assertion is true but reason is false

• If both assertion and reason are false.

Companion cell in plants are associated with

• vessels

• sieve elements

• sperms

• guard cells

Assertion : Long distance flow of photoassimilates in plants occurs through sieve tubes.

Reason : Mature sieve tubes have parietal cytoplasm and perforated sieve plates.

• 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

The plant undergoes wilting when

• xylem is blocked

• cambium is blocked

• phloem is blocked

• some roots are reduced in number

Vascular bundles of roots are

• conjoint

• concentric

• bicollateral

• radial

Ectophloic siphonostele is found in

• Osmunda and Equisetum

• Marsilea and Botrychium

• Adiantum and Cucurbitaceae

• Dicksonia and Maiden hair fern

Lenticular transpiration takes place in

• fruits

• woody stems

• leaves

• all of these

68.

When the cell is fully turgid, its

• DPD = OP

• DPD = zero

• WP = TP

• OP = zero

What is the difference between pinocytosis and phagocytosis?

Graham's law is correlated with

• diffusion

• osmoregulation

• osmosis

• absorption