Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

When an ovary develops into a fruit without fertilization it is called

  • porogamy

  • apospory

  • apogamy

  • parthenocarpy


D.

parthenocarpy

Parthenocarpicfruits are seedless and develop from ovary without fertilization.

Porogamy is the fertilization of a seed plant involving passage of the pollen tube into the ovule by the micropyle.

Apospory is the development of 2n gametophytes, without meiosis and spores, from vegetative, or non- reproductive, cells of the sporophyte.

Apogamy is the development of 1n sporophytes without gametes and syngamy from vegetative cells of the gametophyte.


42.

Ethylene is

  • gaseous hormone

  • largest hormone

  • liquid hormone

  • solid hormone


A.

gaseous hormone

Ethylene is the smallest gaseous phytohormone.


43.

Photorespiration takes place in plants where carbon fixation occurs through

  • Calvin cycle

  • Hatch and Slack cycle

  • Glycolysis

  • Krebs' cycle


A.

Calvin cycle

Photorespiration or (C2-cycle) occurs only in C3 plants.


44.

Post erythrocytic cycle of Plasmodium is also called

  • Ross cycle

  • Krebs' cycle

  • WBCs cycle

  • Golgi cycle


A.

Ross cycle

Post erythrocytic cycle was studied by Sir Ronald Ross in mosquito female Anopheles. Therefore, it is called Ross cycle.


45.

Chlorophyll- a is characterized by the side group

  • methyl

  • aldehyde

  • phytol

  • ketone


A.

methyl

Chlorophyll- a has R = CH, (methyl group) and chlorophyll- b has R = CHO (aldehyde  group).


46.

Chloroplast has maximum quantity of .......... in stroma.

  • dehydrogenase

  • RuDP carboxylase

  • pyruvic carboxylase

  • hexokinase


B.

RuDP carboxylase

RuDP Carboxylase is made up of rubisco protein which is most abundant plant protein on earth.


47.

Entamoeba gingivalis is causative agent of

  • pyorrhoea

  • amoebiasis

  • bronchitis

  • no disease but aggrevates pyorrhoea


D.

no disease but aggrevates pyorrhoea

Entamoeba gingivalis is not a causative agent of pyorrhoea, it aggrevates it. The causative agent is Trichomonas tenax.


48.

Atactostele vascular bundles are

  • scattered in the ground tissue

  • three in number

  • in form of ting around

  • broken vascular bundles


A.

scattered in the ground tissue

Actactostele is a type of eustele, found in monocots, in which the vascular tissue in the stem exists as scattered bundles.


49.

Vivipary is shown by

  • Cocos

  • Squash

  • Rhizophora

  • All of the above


D.

All of the above

The seeds which germinate when attach to parent plants are called viviparous and this phenomenon vivipary. All these seeds have high moisture content.


50.

GA usually promotes

  • sterility in flowers

  • maleness in flowers

  • femaleness in flowers

  • Both (b) and (c)


B.

maleness in flowers

It was observed in flowers of Geranium and Balsamea that GA induces male flowers.