Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

11.

During mitosis nuclear membrane disappears at

  • early prophase

  • late prophase

  • metaphase

  • anaphase


B.

late prophase

In mitosis, during late prophase or prometaphase, nuclear membrane completely disappear while mutant form is observed rarely.


12.

In human beings, which hormone acts as a mild growth hormone?

  • Prolactin

  • Oestrogen

  • Progesterone

  • Cortisol


A.

Prolactin

Prolactin is the lactogenic hormone. It stimulates mammary growth and differentiation and milk production. Therefore, it indirectly controls growth.


13.

Red muscle cells are rich in

  • only myosin

  • haemoglobin and glucose

  • lactic acid and acetic acid

  • myoglobin and cytochrome


D.

myoglobin and cytochrome

Red muscles are the muscles in which dark bands or fibers are dominant, and they contain a large amount of myoglobin and mitochondria in it. Red muscle fibres are thin, dark red and possess a red haem protein called myoglobin. 


14.

The controlling centre of cell is

  • nucleus

  • nucleolus

  • mitochondria

  • ribosome


A.

nucleus

Hammerling proved that nucleus is the main controlling centre of cell while working on Acetabularia.


15.

Kidney stones are crystals of

  • sodium chloride

  • silica

  • calcium oxalate

  • potassium chloride


C.

calcium oxalate

Kidney stones are commonly crystals of calcium oxalate and the patients are therefore, advised to avoid spinach, rhubarb and asparagus in their diet.


16.

All the following are the properties of skeletal muscles except

  • excitability

  • contractility

  • rhythmicity

  • toxicity


C.

rhythmicity

Excitability, contractibility and toxicity are the properties of skeletal muscles. Rhythmicity is one of the property or feature of cardiac balance.


17.

In testis of frog, there are no

  • Sertoli cells

  • spermatocytes

  • spermatids

  • intestinal cells


A.

Sertoli cells

Sertoli cells are characteristic of only mammalian testis for the nourishment of spermatozoan.


18.

One difference in breathing mechanism of frog and rabbit is that

  • expansion of frog's lungs is not much

  • abdominal movements more in frog

  • diaphragm and rib muscles play important role in rabbit

  • air reaching frog's lungs is to cool


C.

diaphragm and rib muscles play important role in rabbit

Respiration of frog is not very efficient as compared to mammals. The diaphragm is absent in frog whereas it is found in rabbit.


19.

Iron is stored in bone marrow as

  • haemosedrin

  • ferritin

  • haematin

  • None of these


B.

ferritin

Iron is stored in bone marrow and liver in the form of ferritin and transferrin coming from food sources. They both are the important sites for the storage of iron.


20.

Pepsin acts in

  • basic medium

  • acidic medium

  • neutral medium

  • All of these


B.

acidic medium

Pepsin acts in an acidic medium. The HCl present in the stomach provides the pH (1-2) necessary to ensure the activation of pepsinogen to active form pepsin.