Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Which one of the followings in birds, indicates their reptilian ancestry?

  • Scales on their hind limbs

  • Four chambered heart

  • Two special chambers crop and gizzard in their digestive tract

647 Views

12.

Endosperm is consumed by developing embryo in the seed of 

  • coconut

  • castor

  • pea

  • pea

524 Views

13.

The rupture and fractionation do not usually occur in the water column in vessel/tracheids during the ascent of sap because of 

  • lignified thick walls

  • cohesion and adhesion

  • weak gravitational pull

  • weak gravitational pull

454 Views

14.

The blood calcium level is lowered by the deficiency of 

  • parathormone

  • thyroxine

  • calcitonin

  • calcitonin

388 Views

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15.

Which one of the following is heterosporous? 

  • Dryopteris 

  • Salvinia

  • Adiantum

  • Adiantum


B.

Salvinia

Heterospory is the production of spores of two different sizes and two different developmental patterns. Small spores are called microspores and larger as megaspore. Microspores germinate to produce the male gametophyte or microgametophyte that bear male sex organs while megaspores germinate to form female gametophyte or megagametophytes that bear archegonia or female sex organs. It is most important evolutionary development in the vascular plants because it has ultimately lead to seed development eg, Selaginella, Marselia Salvinia, Azolla, isoetes.

Dryopteris is homosporous a 32-64 haploid spores are produced in each sporangium.
Adiantum is also homosporous. The spores are the pioneer structures of the gametophytic generation.

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16.

Dry indehiscent single-seeded fruit formed from bicarpellary syncarpous inferior ovary is 

  • Caryopsis

  • cypsela

  • Adiantum

  • Adiantum

381 Views

17.

The fleshy receptacle of  syconus of fig encloses a number of 

  • achenes

  • samaras

  • berries

  • berries

522 Views

18.

Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?

  • Bacterial leaf blight of rice

  • Downy mildew of grapes

  • Loose smut of wheat

  • Loose smut of wheat

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19.

The length of different internodes in a culm of sugarcane is variable because of

  • shoot apical meristem

  • position of axillary buds

  • size of leaf lamina at the node below each internode

  • size of leaf lamina at the node below each internode

362 Views

20.

Which one of the following is the correct difference between rod cells and cone cells of our retina? 

  • Features

    Rod cells

    Cone cells

    Visual acuity

    High

    Low

  • Features

    Rod cells

    Cone cells

    Visual Pigment contained

    Iodeosin

    Rhodopsin

  • Features

    Rod cells

    Cone cells

    Overall function

    Vision in poor light

    Colour vision and detailed vision in bright light

  • Features

    Rod cells

    Cone cells

    Overall function

    Vision in poor light

    Colour vision and detailed vision in bright light

314 Views

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