Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.

  • C- Vena Cava - takes blood from body parts to right atrium, Pco2 = 45 mm Hg

  • D- Dorsal aorta - takes blood from heart to body parts, Po= 95 mm Hg

  • A- Pulmonary vein - takes impure blood from body parts to heart, Po2 = 60 mm Hg

  • B- Pulmonary artery - takes blood from heart to lungs, Po2= 90 mm Hg.


A.

C- Vena Cava - takes blood from body parts to right atrium, Pco2 = 45 mm Hg

In the given figure:

1. A is pulmonary vein which brings pure blood from lungs to left atrium.

2. B is dorsal aorta which carries blood from heart to body parts.

3. C is vena cava which carries impure blood from body parts to right atrium.

4. D is pulmonary artery which takes impure blood from heart to lungs.


2.

Identify the given structure

  • Adenylic acid

  • Uracil

  • Cholesterol

  • Adenosine


B.

Uracil

Uracil is one of the four nucleobases in the nucleic acid of RNA. It binds to adenine via two hydrogen bonds in RNA. It is replaced by thymine in case of DNA.


3.

The volume of 'anatomical dead space' air is normally

  • 230 mL

  • 210 mL

  • 190 mL

  • 150 mL


D.

150 mL

Anatomical Dead Space is the total volume of the conducting airways from the nose or mouth down to the level of the terminal bronchioles and is about 150 mL on the average in humans.


4.

Which of the following are homosporous pteridophytes?

I. Selaginella

II. Lycopodium

III. Salvinia

IV. Equisetum

  • I and IV only

  • II and III only

  • II and IV only

  • III and IV only


C.

II and IV only

Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous pteridophytes. Lycopodium and Equisetum are homosporous pteridophytes i.e. they produce only one type of spores.


5.

Which one of the following is not a mammalian character?

  • Presence of milk producing glands

  • Skin is unique in possessing hair

  • Presence of external ears called pinnae

  • Homodont type of dentition


D.

Homodont type of dentition

Mammals have heterodont type of dentition i.e, teeth are of different types.


6.

One hormone hastens maturity period in juvenile conifers, a second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively

  • Gibberellin, Auxin, Ethylene

  • Auxin, Gibberellin, Cytokinin

  • Gibberellin, Auxin, ABA

  • Auxin, Gibberellin, ABA


C.

Gibberellin, Auxin, ABA

Spraying juvenile conifers with gibberellins hastens their maturity period, thus leading to early seed production. Auxin controls xylem differentiation. Abscisic acid (ABA) increases the tolerance ofplants to various kinds ofstresses therefore, is also known as stress hormone.


7.

Cornea transplant in humans is almost never rejected. This is because

  • it is composed of enucleated cells

  • it is a non-living layer

  • its cells are least penetrable by bacteria

  • it has no blood supply


D.

it has no blood supply

Cornea is a tranparent layer of tissue continuous with sclerotic that forms the front part of vertebrae eye over the iris and lens. It refracts light waves entering the eye onto lens. Cornea is avascular (ie, it has no blood supply). It is one of the first organs to be successfully transplanted because it lacks blood vessels.


8.

Retrogressive metamorphosis occurs in

  • Hemichordata

  • Cephalochordata

  • Urochordata

  • Vertebrata


C.

Urochordata

In retrogressive metamorphosis, degeneration is shown by larva to form less developed adult. It is a type of metamorphosis seen in Herdmania (Urochordate). It involves transformation of an active, free swimming larva with advanced characters into sedentary and simple adult.


9.

Pseudostratified epithelium is found in

  • seminiferous tubule

  • Fallopian tube

  • trachea

  • kidney tubules


C.

trachea

Pseudostratified columnar ciliated epithelium occurs in the trachea and large bronchi. It is a type of epithelium that comprises only a single layer of cells.


10.

The H-zone in the skeletal muscle fibre is due to

  • the central gap between actin filaments extending through myosin filaments in the A-band

  • extension of myosin filaments in the central portion ofthe A-band

  • the absence of myofibrils in the central portion of A-band

  • the central gap between myosin filaments in the A-band.


A.

the central gap between actin filaments extending through myosin filaments in the A-band

Each muscle fibre has many parallely arranged myofibrils. Each myofibril contains many serially arranged units called sarcomere which are the functiorial units. Each sarcomere has a central 'A' band made of thick myosin filaments, and two half 'T' bands made of thin actin filaments on either side of it marked by Z' lines. In a resting state, the edges of thin filaments on either side of the thick filaments partially overlap the free ends of the thick filaments leaving the central part of the thick filaments. This central part of thick filament, not overlapped by thin filaments is called the 'H' zone.