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NEET biology

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Question
CBSEENBI11002375
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Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?

  • One can breathe out air totally without oxygen

  • One can breathe out air through eustachian tubes by closing both the nose and the mouth

  • One can consously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all

  • The lungs can be made fully empty by forcefully breathing out all air from them

Solution

B.

One can breathe out air through eustachian tubes by closing both the nose and the mouth

A eustachian tube connects the middle ear cavity with the pharynx. The eustachian the pressure on either side of the eardrum (tympanic membrane).

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Question
CBSEENBI11002376
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Which one of the following statements is totally wrong about the occurrence of the notochord, while the other three are correct? 

  • It is present only in larval tail in Ascidians

  • It is replaced by a vertebral coloumn in adult frog

  • It is absent throughout life in humans from the very beginning

  • It is present throughout life in Amphioxus

Solution

C.

It is absent throughout life in humans from the very beginning

The notochord is a flexible, rod -shaped body found in the embryo of all chordates. It is composed of cells derived from the mesoderm. It represents the primitive axis of the embryo. In some chordates, it persists throughout life as the main axial support of the body (e.g. Amphibians), while in most vertebrates including humans it becomes the vertebral body of the vertebral column.

Question
CBSEENBI11002377
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The cells lining the blood vessels belong to  the category of 

  • smooth muscle tissue

  • squamous epithelium

  • columnar epithelium

  • connective tissue

Solution

B.

squamous epithelium

The squamous epithelium is made up of a single thin layer of flattened cells with irregular boundaries. They are found in the walls of blood vessels and air sacs of lungs and are involved in functions like forming a diffusion boundary

Question
CBSEENBI11002378
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The pathogen Microsporum responsible for ringworm disease in humans belongs to the same kingdom of organisms as that of 

  • Taenia, a tapewarm

  • Wuchereria, a filarial worm

  • Rhizopus, a mould

  • Ascaris, a round worm

Solution

C.

Rhizopus, a mould

Many fungi belonging to the genera-Microsporum, Trichophyton and Epidermophyton are responsible for ringworms which is one of the most common infectious diseases in man. Microsporum is a member of the class- Deuteromycetes (Fungi imperfecti) of Kingdom - Fungi, Rhizopus (bread mould) is a member of the class - Zygomycetes (conjugation fungi) of Kingdom - Fungi.

Question
CBSEENBI11002379
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At metaphase, chromosomes are attached to the spindle fibres by their

  • satellites

  • Secondary constrictions

  • Kinetochores

  • centromere

Solution

C.

Kinetochores

Kinetochores ar small disc -shaped proteinous structures present at the surface of the centromere. These structures serve as the sites of attachment of spindle fibres to the chromosomes that are moved into position at the centre of the cell.

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