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 Answer is :(a) Skin epithelial cells

Innate immunity refers to non-specific defence mechanisms that come into play immediately or within hours of an antigen’s appearance in the body. These mechanisms include physical barriers such as skin epithelial cells, chemicals in the blood and immune system cells that attack foreign cells in the body.

Correct option  (A) Skin epithelial cells

Explanation:

Innate immunity is general defense of body eq.

1.  Phagocytosis of invanders by macrophage 

2.  Restistance of skin to invading micro-organism 

3.  Destruction of micro-organisms by HCl in digestive juice etc.

Correct option  (B) 2

Explanation:

2 pyruvic acid molecule are formed from one glucose molecule during glycolysis.

Answer is : (b) 2

Atomic number of ₁₆S³² is 16. Its electronic configuration using 2n² rule is

₁₆S = 1s²[Ne], 2s²p⁶[Ne], 3s²p⁴[Unfilled]

So, number of fully filled orbits or shells is 2.

Answer is : (a) had atomic number 2 and were fully ionised

Particles used in Rutherford’s scattering experiment (Geiger-Marsden experiment) are α-particles derived from a tube of radium emanation (or radon).

α-particles are helium nuclei ₂⁴He, they are fully ionised and have atomic number 2.

Correct option  (A) 15

Explanation:

EDUCATION

Vowels EUAIO

Consonant DCTN

 = 1 x ⁶C₄ x 1

= 15

Correct option is (d) pod length

Mendel did not choose pod length. 

The seven contrasting traits he took were 

● Plant height 

● Flower position 

● Pod colour 

● Pod shape 

● Flower colour 

● Seed shape 

● Seed colour

Correct option is (a) Class

The levels of classification from the broadest to the narrowest, i.e. in term of having highest members to the lowest members are kingdom, phylum, class, order, family, genus and species.

Correct option  (B) 1/12 

Explanation:

Total time for cell cycle = 24 hrs.

Time for M-phase = 2 hrs

So, probability of cell in M-phase at any given time is 2/24 ⇒ 1/12

Correct option  (B) Non-disjunction in meiosis I 

Explanation:

Egg cell is formed by meiosis. Less number of chromosome indicates non-disjunction in meiosis I.

Correct option is (d) light saturated and the temperature is above optimum

The amount of light given is saturated, not limited. Therefore the answer is (d). The concentration of carbon dioxide is in short supply, hence limiting the rate of photosynthesis.

Correct option (B) II and III only 

Explanation:

Take combination such as x = 1, y = 7, z = 5

Now, check options

(ii) & (iii) statement are correct.

Answer is : (a) 0.703

Respiratory Quotient (RQ) measures the ratio of the volume of carbon dioxide (V_C) produced by an organism to the volume of oxygen consumed (V_O). The RQ for the given equation is

RQ = CO₂ produced/O₂ consumed = 102/145 = 0.703.

RQ = 0.703

Correct option  (A) Pyridoxal-6-phosphate 

Explanation:

Information based question

Correct option  (B) 2

Explanation:

In glycolysis net ATP produced

= 4 – 2 = 2 ATP

Answer is : (a) ovary

Relaxin hormone is produced by the ovary and the placenta with important effects in the female reproductive system and during pregnancy. In preparation for childbirth, it relaxes the ligaments in the pelvis and softens and widens the cervix.

Answer is : (a) Lepidoptera

The order of silkworm (Bombyx mori) is Lepidoptera. It is the order of insects that includes butterflies and moths. About 1,80,000 species of the Lepidoptera are described till now.

Answer is : (d) 500 kg

We have,

1000 kg of watermelon in which 99% are water.

∴ 990 kg water and 10 kg rest.

Now, x kg watermelon has

= 98/100 x water + 2x/100 rest

Weight of solid part should remain same

∴ 2x/100 = 10 ⇒ x = 500

∴ Weight reduction = (1000 - 500) kg

= 500 kg

Correct option is (d)

At low temperature, H₂ molecule has only translational degrees of freedom

∴ f = 3

Above 600 K molecule be given to vibrate and at above 3000 K molecule dissociates.

Answer is : (b) exosmosis 

Excess salt inhibits growth in pickles by exosmosis. Salt kills and inhibits the growth of microorganisms by drawing water out of the cells of both the microbe and the food through osmosis (or more specifically exosmosis). Due to hypertonic solution outside the bacterial cell, bacteria will die by plasmolysis.

Correct option  (a)  8

Explanation:

Number of plants with particular genotype can be calculated by the formula 2ⁿ, where n is the number of heterozygous gene in the desired genotype. Therefore, plants with genotype AabbCcDd = 2³ = 8. Thus, the correct answer is option A.

Correct option  (C) Lactose is converted to allolactose, which binds to the repressor protein and prevents its interaction with O.

Explanation:

Lac operon is inducible operon here.

Correct option (D) 97 – 100

Explanation:

After selfing homozygous indivisiual produces All white & red offspring and heterozygous also produces 50%. Red & White flower.

Answer is : (b) 18

We have, n ∈ {2, 3, 4, 5, 6, …, 200} 1/n has terminating decimal of n = 2^a  x 5^b

∴ n = 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 128, 160, 200

∴ Total number of n = 18

Correct option  (C) Trypsin

Explanation:

Enzyme ‘X’ hydrolyses peptide bond so it is a proteolytic enzyme -

⇒  Amylase → Starch digesting enzyme

⇒ Lipase → Fact digesting enzyme

⇒ Trypsin → Protein digesting enzyme 

⇒ Maltase → Maltose digesting enzyme (Disaccharides)

Answer is : (b) antigen A and B on RBCs, but neither anti-A nor anti-B antibodies in plasma

Person with blood group AB have both A and B antigen in the membrane of his red blood cell but lacks both antibodies (a, b) in his plasma. Due to this reason, blood group AB is called universal recipient.

Answer is : (d) the HCF of N₁ and N₂ is 33

It is given that, N₂ = 165

= 3 x 5 x 11 and N₁ = 2⁵⁵ + 1

As we know that, if n is odd integer then xⁿ + yⁿ is divisible by x + y.

So, N₁ = 2⁵⁵ + 1⁵⁵ is divisible by 2 + 1 = 3 and N₁ = 2⁵⁵ + 1⁵⁵

= (2⁵)¹¹ + (1⁵)¹¹ = (32)¹¹ + (1)¹¹

is divisible by 32 + 1 = 33

∴ the HCF of N₁ and N₂ is 33.

Correct option is (c) T_B > T_A 

Part of heat given to A is used up in doing work (against) gravitational force. So, temperature of B will be slightly higher.

Correct option  (A) exactly one real root for any real a

Explanation:

f'(x) = 3x₂ – 6ax + 27a² + 9

= 3[x² – 2ax + 9a² + 3] = 3((x – a)² + 8a² + 3)

f'(x) is + ve for x ∈ R so f(x) is monotonic↑

for x  ∈ R. 

Answer is : (b) diffusion

Gaseous exchange occurs at the alveoli in the lungs and takes place by diffusion. The alveoli are surrounded by capillaries so, oxygen and carbon dioxide diffuse between the air in the alveoli and the blood in the capillaries. Diffusion is the movement of gas from an area of high concentration to an area of low concentration.

Answer is : (b) Cambrian period

The class Ostracodermi is represented by the fossil vertebrates of late Cambrian period. The earliest known vertebrates to appear in fossil record were jawless primitive fish-like animals collectively called ostracoderms. These animals resembled the present day cyclostomes (lampreys and hagfishes) in many respects.

Correct option  (C) 11.2 

Explanation:

he correct way of reporting the average value should have exactly the same number of digit after decimal which has least digit after decimal among the data given.