Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

Which part of human brain is concerned with the regulation of body temperature?

  • Medulla oblongata

  • cerebellum

  • cerebrum

  • cerebrum

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12.

Which one of the following are the correct pairing of a body part and the kind of muscle tissue that moves it?

  • Heart wall - Involuntary unstriated muscle

  • Biceps of upper arm - smooth muscle fibres

  • Abdominal wall - Smooth muscle

  • Abdominal wall - Smooth muscle

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13.

Oxygenic photosynthesis occurs in

  • Chromatium

  • Oscillatoria

  • Rhodospirillum

  • Rhodospirillum


B.

Oscillatoria

Oscillatoria is a photosynthetic cyanobacterium. In this, during photosynthesis water is electron donor and oxygen is a by -product, ie oxygenic photosynthesis occurs. Rhodospirillum and Chlorobium are non- oxygenic photosynthetic, purple non- sulphur and green sulphur bacteria. chromatium is a purple sulphur bacterium, also a non- oxygenic photosynthetic.

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14.

The genetic defect-Adenosine Deaminase (ADA) deficiency may be cured permanently by

  • periodic infusion of genetically engineered lymphocytes having functional ADA cDNA

  • administering denosine deaminase activators

  • introducing bone marrow cells producing ADA into cells at early embryonic stages

  • introducing bone marrow cells producing ADA into cells at early embryonic stages

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15.

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

  • maturing

  • elongating

  • widening

  • widening

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16.

In barley stem, vascular bundles are

  • open and scattered

  • closed and scattered

  • open and in a ring

  • open and in a ring

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17.

If a live earthworm is pricked with a needle on its outer surface without damaging its gut, the fluid that comes out is

  • excretory fluid

  • coelomic fluid

  • haemolymph

  • haemolymph

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18.

In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?

  • R-repolarisation of ventricles

  • S- start of systole

  • T -end of diastole

  • T -end of diastole

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19.

Middle lamella is mainly composed of 

  • hemicellulose

  • muramic acid

  • calcium pectate

  • calcium pectate

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20.

Plasmodesmata are

  • lignified cemented layers between cells

  • locomotory structures

  • membranes connecting the nucleus with the plasmalemma

  • membranes connecting the nucleus with the plasmalemma

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