Assertion : On plotting the length of the root against time, a linear curve is obtained.

Reason : An elongating rout exemplifies arithmetic growth.

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

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Identify the given figures A, B, C, D and E.

• A	B	C	D	E
  Marginal	Axile	Free central	Parietal	Basal

• A	B	C	D	E
  Marginal	Parietal	Free central	Axile	Basal

• A	B	C	D	E
  Marginal	Axile	Parietal	Free central	Basal

• A	B	C	D	E
  Marginal	Axile	Parietal	Basal	Free central

• structure of lenticel

• hydathode showing gaseous vapour exchange

• fungus reproducing by spore formation

• algae reproducing by spore formation.

Cleistogamy is leading over anthesis because

• pollination agent is not required

• it assures heterozygosity

• it favours insect pollination

• it allows xenogamy

Which of the following is true?

• Umbel is a racemose inflorescence where all stalked flower aggregate on the flat receptacle

• Raceme is a racemose inflorescence having main axis shortened & flower born acropetally

• Spadix is a racemose inflorescence having pendulous spike with main axis much flattened.

• Spike is a racemose inflorescence having sessile flowers

The branched sclereids present in hydrophytes are

• osteosclereids

• trichosclereids

• macrosclereids

• astrosclereids

Cut surfaces of fruit and vegetables often become dark because

• dirty knife makes it dark

• oxidation of tannic acid in the presence of trace of iron from the knife makes it dark

• dust of the air makes it dark

• none of the above.

Ectophloic siphonostele is found in

• Osmunda and Equisetum

• Marsilea and Botrychium

• Adiantum and Cucurbitaceae

• Dicksonia and Maidenhair fern.

109.

Composite fruit develops from

• single ovary

• inflorescence

• apocaropous ovary

• pericarp

Cocoa is the plant from which chocolate is made. Which part is used to extract it?

• Flower

• Fruits

• Seeds

• Bark