Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

In frog, the vertebra with an anterior convex surface (i.e., double convexties) is

  • atlas

  • urostyle

  • 8th vertebra

  • 9th vertebra


D.

9th vertebra

The 9th or sacral vertebra is acoelous and highly specialised the anterior face is convex for this give greater strength them, it would be given if its anterior end are hollowed out the transverse process are stout and downwardly directed. The ileum of the pelvic girdle articulates with the transverse process of 9th vertibrae.


22.

What is left when bath sponges dries up

  • Spicules

  • Spongin fibres

  • Tentacles

  • Holdfast


B.

Spongin fibres

Euspongia is called bath spongia. The sponge are classified on the basis of skeleton which is made up of spongin fibere. After the bath sponge dries only the skeleton is left.


23.

The first phylogenetic system of plant classification was proposed by

  • Engler

  • Engler and Prantl

  • Eichler

  • Wetlstein


C.

Eichler

The first phylogenetic system was proposed by Eichler who is famous for his work entitled "Bluthen Diagramme" published in two volumes.


24.

A nucleoside is

  • base + sugar

  • base + phosphate

  • sugar+ phosphate

  • base + sugar+ phosphate


A.

base + sugar

Base+ sugar form a nucleoside and base+ sugar + phosphate group combine together to give a nucleotide.


25.

Cellulose fibre is obtained from Gossypium.

  • stem surface

  • seed hair

  • leaf surface

  • root hair


B.

seed hair

Cotton is the seed surface fibre of Gossypium. Its processing involves ginning, bailing, picking, lapping, carding and twisting. It is used in textile industry.


26.

RBC's are nucleated in

  • man

  • rat

  • frog

  • rabbit


C.

frog

RBC in man is anucleated. Nucleated RBCs are found in camel and amphibians (e.g. frog). In frog, RBCs are typically flattened and more or less eliptical in shape but it appears biconvex when seen along its edge. They filled with cytoplasm of faint straw colour and contains a definite round nucleus in centre.


27.

The vital capacity of lungs is equal to

  • 4000 ml

  • 5000 ml

  • 6000 ml

  • 7000 ml


B.

5000 ml

The vital capacity is the maximum amount of air that can be expelled from lungs by forced exhalation after a forced inhalation. It is equal to the sum of tidal volume (TV), inspiratory reserve volume (IRV) and expiratory reserve volume (ERV).
VC= TV+ IRV+ ERV
    = 500 + 3000 + 1100
    =4600 ml


28.

Plants growing on sand and gravel are called

  • eremophytes

  • psammophytes

  • psilophytes

  • oxylophytes


B.

psammophytes

Psammophytes grow in sand and gravel, eremophytes grow in desert and gravel, psilophytes grow in savanna and oxylophytes grow on acidic soil.


29.

The inflorescence in Ocimum is

  • cyathium

  • verticillaster

  • hypanthodium

  • raceme


B.

verticillaster

Verticillaster consists of biparous cymes ending in uniparous scorpioid cymes on either side e.g. Ocimum and several members of family Labiatae.


30.

Mannitol is reserve food in

  • Rhodophyceae

  • Chlorophyceae

  • Phaeophyceae

  • Xanthophyceae


C.

Phaeophyceae

Class Phaeophyceae includes brown algae Brown algae are marine plants. Chief pigments found in the members of this class are chlorophyll a and c β-carotene, violaxanthin, fucoxanthin, lutein, diatoxanthin. Reserve food is laminarin, mannitol and oils.