Subject

Biology

Class

NEET Class 12

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

 Multiple Choice QuestionsMultiple Choice Questions

11.

Which one of the following correctly explains the function of a specific part of a human nephron?

  • Henle's loop - most reabsorption of the major substances from the glomerular filtrate

  • Distal convoluted - reabsorption of ion into the surrounding blood capillaries

  • Afferent arteriole - carries the blood away from the glomerulus towards renal vein

  • Afferent arteriole - carries the blood away from the glomerulus towards renal vein


D.

Afferent arteriole - carries the blood away from the glomerulus towards renal vein

Podocytes or cvisceral epithelial cells are the cells in Bowman's capsule in the kidneys that wrap around the capillaries of glomerules. They create minute pores (slit pores) for the filtration of blood into the Bowman's capsule.

347 Views

12.

What would be the number of chromosomes of the aleurone cells of a plant with 42 chromosomes in its root tip cells? 

  • 63

  • 84

  • 21

  • 21


A.

63

The outermost cell layer of the endosperm (3n) of seed is called aleurone layer. Since the cells of aleurone layer are triploid, the number of chromosomes would be = 63, as root tip cells (2n) has 42 chromosomes.

729 Views

13.

Which one of the following plasma proteins is involved in the coagulation of blood? 

  • Serum amylase

  • A globulin

  • Fibrinogen 

  • Fibrinogen 


C.

Fibrinogen 

Fibringoen (factor 1) is a soluble plasma glycoprotein, synthesised by the liver. It is converted by thrombin inot fibrin during blood coagulation. Fibrin is the cross - linked by factor XIII to form a clot. 

337 Views

14.

Organisms called Methanogens are most abundant in a 

  • cattle yard

  • polluted stream

  • hot spring

  • hot spring


A.

cattle yard

Methanogens are present in the git of several ruminants animals such as cows and buffaloes and they are responsible for the production of methan (biogas) from the dung of these animals. Thus, they are most abundant in a cattle yard. 

529 Views

15.

Select the correct option with respect to mitosis

  • Chromatids start endoplasmic 

  • Golgi complex and endoplasmic reticulum are still visible at the end of prophase

  • chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase

  • chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase


C.

chromosomes move to the spindle equator and get aligned along equatorial plate in metaphase

In metaphase of mitosis, spindle fibres attach to kinetochore of chromosomes. Chromosomes are moved to spindle equator and get aligned along meta phasic plate through spindle fibres to both poles.

362 Views

16.

Continuous addition of sugars in 'fed-batch' fermentation is done to

  • obtain antibiotics 

  • purify enzymes

  • degrade sewage

  • degrade sewage


B.

purify enzymes

A fed batch is a biotechnological batch process which is based on feeding of growth limiting nutrient substrate to a culture continuous addition of sugars in fed batch fermentation is done to purify enzymes.

975 Views

17.

Which of the following are correct states as it happens in the common cockroach?

  • Oxygen is transported by haemoglobin in blood 

  • Nitrogenous excretory products is urea

  • The food is ground by mandibles and gizzard

  • The food is ground by mandibles and gizzard


C.

The food is ground by mandibles and gizzard

407 Views

18.

Important  site for formation of glycoproteins and glycolipids is

  • Golgi apparatus 

  • plastid

  • lysosome

  • lysosome


A.

Golgi apparatus 

The Golgi apparatus principally performs the function of packaging materials. Golgi apparatus is the main site of formation of glycoproteins and glycolipids.

385 Views

19.

The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of the human eyes is a derivative of 

  • Vitamin -C 

  • Vitamin -D 

  • Vitamin - A 

  • Vitamin - A 


A.

Vitamin -C 

There are two types of photoreceptor cells of retina, namilyrods and cones. The rods contain a purplish red protein called the rhodopsin or visual purple, which contains a derivative of vitamin - A. 

444 Views

20.

Which of the following enzymes carries out initial step in the digestion of milk in humans?

  • Rennin

  • Lipase

  • Trypsin

  • Trypsin


D.

Trypsin

In human milk protein digesting enzyme in stomach is pepsin.In calves it is renin.It is alos present in small amounts in human infants but not adults. Pepsin acts on water soluble 'caseinogen (milk protein) to form soluble 'casein'. This combines with calcium salts to form insoulble calcium paracaseinate, which gets readily digested enzymatically.

493 Views