## 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.

# NEET Biology Solved Question Paper 2013

#### Multiple Choice Questions

11.

Which of the following inhibits O2 release in light phase?

• Zeatin

• PMA

• DCMU

• None of these

C.

DCMU

DCMU is a very specific and sensitive inhibitor of photosynthesis (photosynthetic inhibitors). It blocks the plastoquinone binding site of photosystem II, disallowing the electron flow from photosystem II to plastoquinone. Thus, it inhibits Hill reaction, by inhibiting release of O2.

12.

When the organic acid is oxidised in respiration, the value of R.Q. becomes

• zero

• one

• less than one

• more than one

D.

more than one

When an organic acid is oxidised the value of R.Q. in respiration becomes more than one. Because organic acids are rich in O2 and require less O2 for their oxidation. It is clear from the equation given below.

C4H6O5 (Malic acid) + 3O2 $\to$4CO2 + 3H2O

$\therefore$R.Q. =

R.Q = 1.3 (more than one)

13.

Bilirubin and biliverdin are

• enzymes

• bile salts

• bile pigments

• None of these

C.

bile pigments

Bilirubin and biliverdin are the break down products of haemoglobin formed by the liver and secreted in the bile to be stored in the gall-bladder. They are required for digestion and absorption of fats.

14.

ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are possible?

• Three

• Six

• Five

• Four

D.

Four

The six genotypes are as follows:

IAIA or IAi or IBIB or IBi  or IAIor ii

15.

Auxin was first named by

• C Darwin

• FW Went

• Alexopolus

• KV Thimann

B.

FW Went

FW Went (1928) was the first person to name auxins. Thimann (1936) isolated IAA from Rhizopus sinus and Avena coleoptiles.

16.

The nitrifying bacteria that convert the ammonia to nitrates are

• Nitrosomonas and Nitrobacter

• Azotobacter

• Rhizobium sp.

• Thiobacillus denitrificans

A.

Nitrosomonas and Nitrobacter

Nitrification is the phenomenon of conversion of ammonium to nitrate by nitriflying bacteria like Nitrosomonas, Nitrobacter, etc. It occurs in two steps-

2NH3 + 3O2 $\stackrel{Nitrosomonas}{\to }$ 2NO-2 + 2H+ + 2H2O + Energy

2NO-2 + O2 $\stackrel{Nitrobacter}{\to }$ 2NO-3 + Energy

17.

Ivan Pavlov performed experiments on

• origin of life

• cardiac reflexes

• simple reflexes

• conditioned reflexes

D.

conditioned reflexes

Conditioned reflex is an automatic response established by training to an ordinarily neutral stimulus. They were first demonstrated in 1920s by the Russian physiologist I.P. Pavlov. He found that the sight and smell of food reflexly cause flow of saliva in hungry animals.

18.

Marasmus in children is caused by deficiency of

• protein

• fats

• vitamins

• carbohydrates

A.

protein

Marasmus is a protein energy malnutrition disorder.  It is found in infants due to lack of proper diet of protein and calories. It is also in case of less breast feeding diet. Due to this body become lean and weak, eyes depressed and skin wrinkled.

# 19.According to Boyle's law, the product of pressure and volume is a constant. Hence,if volume of lungs is increased, the pressure decreases disproportionately if volume of lungs is increased, the pressure remains the same if volume of lungs is increased, the pressure decreases proportionately if volume of lungs is increased, the pressure also increases proportionately

C.

if volume of lungs is increased, the pressure decreases proportionately

Boyle's law states that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature. Hence, if volume of lungs is increased, the pressure decreases proportionately.

20.

Which of the following genotypes does not produce a sugar polymer on the surface of the RBCs?

• IAIA

• IAi

• ii

• IAIB

C.

ii

Alleles IA and IB produce sugar whereas allele i does not produce any sugar.