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NEET biology

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Question
CBSEENBI11003465
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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

Solution

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.

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Question
CBSEENBI11003474
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Identify the given structure

  • Adenylic acid

  • Uracil

  • Cholesterol

  • Adenosine

Solution

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.

Question
CBSEENBI11003475
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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

Solution

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.

Question
CBSEENBI11003476
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Pseudostratified epithelium is found in

  • seminiferous tubule

  • Fallopian tube

  • trachea

  • kidney tubules

Solution

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.

Question
CBSEENBI11003482
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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, Po2 = 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.

Solution

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.

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