Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

Lack of relaxation between successive stimuli in sustained muscle contraction is known as

  • fatigue

  • tetanus

  • tonus

  • tonus


B.

tetanus

Tetanus results in sustained muscular spasms. This is due to muscle fatigue.

3705 Views

2.

Microtubules are the constituent of

  • spindle fibres, centrioles and cilia

  • centrioles, spindle fibres and chromatin

  • centrosome, nucleosomes and centrioles

  • centrosome, nucleosomes and centrioles


A.

spindle fibres, centrioles and cilia

Microtubules are structures present in cilia, flagella, centrioles and spindle fibres. They are also the part of fibres found in cytoskeleton. 

10482 Views

3.

The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, include the 

  • thermoacidophiles

  • methanogens

  • eubacteria

  • eubacteria


B.

methanogens

Methanogens are group of obligate anaerobic ancient and primitive bacteria. They are involved in the production of the methane gas which is used as a biogas.

1842 Views

4.

Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom

  • Protista

  • Fungi

  • Animalia

  • Animalia


A.

Protista

All the single celled eukaryotic organism are grouped under the Kingdom Protista. These includes euglenoids, dinoflagellates, slime moulds and chrysophytes

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5.

Tricarpellary, syncarpous gynoecium is found in flowers of

  • Solanaceae

  • Fabaceae

  • Poaceae

  • Poaceae


D.

Poaceae

Liliaceae ga G3 condition

2093 Views

6.

Photosensitive compound in human eye is made up of

  • opsin and Retinal

  • opsin ans Retinol

  • transducin and Retinene

  • transducin and Retinene


A.

opsin and Retinal

The photosensitive pigment Rhodopsin of the human eye is made up of opsin and Retinal ( the aldehyde form of vitamin-A/ Retinol). 

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7.

Mitochondria and choloroplast are :
I. semi-autonomous organelles.
II. formed by division of pre-existing  organelles and they contain DNA but lack protein synthesizing machinery. 

  • II is true but I is false

  • I is true but II is false

  • Both I and II are false

  • Both I and II are false


B.

I is true but II is false

Mitochondria and chloroplast have DNA and are capable of self-replication, thus they are semi-autonomous bodies

The organelles do synthesize some of protein and hence they have the protein synthesizing machinery. However, most of the proteins are derived from the nucleus. 

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8.

Reduction in pH of blood will

  • reduce the blood supply to the brain

  • decrease the affinity of haemoglobin with oxygen

  • release bicarbonate ions by the liver

  • release bicarbonate ions by the liver


B.

decrease the affinity of haemoglobin with oxygen

Reduction in pH of blood that is an increase in acidity favours the dissociation of oxyhaemoglobin thereby giving up more O2. phenomenon occurs due to increase in C02 concentration then it is called Bohr effect. 

2760 Views

9.

Which of the following characteristic features always holds true for the corresponding group of animals?

  • Viviparous Mamalia
  • Posess a mouth with an upper and lower jaw Chordata
  • 3-chmbered heart with one incompletely divided ventricle Reptilia
  • Cartiliginous- endoskeleton Chondrichthyes

C.

3-chmbered heart with one incompletely divided ventricle Reptilia

Except for crocodilians, which have a four-chambered heart, all reptiles have a three-chambered heart consisting of two atria and one ventricle. The chamber called the right atrium receives deoxygenated, or "spent," blood returning from the body tissues.

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10.

In which of the following, all three are macronutrients

  • Iron, copper, molybdenum

  • Molybdenum, magnesium, manganese

  • Nitrogen, nickel, phosphorous

  • Nitrogen, nickel, phosphorous


C.

Nitrogen, nickel, phosphorous

Option c is the most appropriate as it has two macronutrients. 

2473 Views