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Answer is : (a) IV < I < III < II

The acidity of compounds in water depends upon the ease with which it can lose H⁺ ions. Acetic acid is the strongest acid as the negative charge on carboxylate ion (conjugate base) is delocalised over two oxygen atoms. Hence, H⁺ ion can be easily lost. The next strongest acidic compound phenol. This is because the phenoxide ion is resonance stabilised. This easily allows the H to leave as H⁺ ion. Among acetonitrile and ethanol, ethanol is more acidic, this is because in ethanol the H-atom is directly attached to more electronegative atom, O. Thus, the correct order of acidity of compound I-IV in water will be

IV < I < III < II.

Correct option  (A) Divergent evolution 

Explanation:

Fore limbs of whale, bat, human & cheetah are homologous organ which represents divergent evolution. 

Correct option  (B) the same autosome

Explanation:

Allele of the same gene are present at same gene locus on homologous chromosome

Correct option  (C) to eliminate the non-transformants

Explanation:

Selectable marker is used to eliminate the non transformant from the transformants

Answer is : (d) Pseudomonas

Pseudomonas is denitrifying bacteria. Denitrifying bacteria are microorganisms whose action results in the conversion of nitrates in soil to free atmospheric nitrogen, thus depleting soil fertility and reducing agricultural productivity.

Answer is : (c) Sunderbans

The Sundarbans delta is the largest mangrove forest in the world and is intersected by a complex network of tidal waterways, mudflats and small islands of salt-tolerant mangrove forests. It lies at the mouth of the Ganges.

A mangrove is a shrub or small tree that grows in coastal saline or brackish water.

Correct option is (a) 6

There are 12 chromosomes present. In a mitotic division, the number of chromosomes remains the same, i.e. 2n → 2n. In a meiotic division, the number is halved, i.e., 2n → n so, there should only be 6 chromosomes in the nucleus.

Correct option is (b) 9

Phosphate group, ribose or deoxyribose group and cytosine group form the nucleotide.

Phosphate (H₃PO₄)

Ribose (C₅H₁₀O₅)

Deoxyribose (C₅H₁₀O₄)

Cytosine has 4 carbon atoms, as it is a pyrimidine. 

Therefore, the nucleotide should have 5C + 4C = 9C

Answer is : (c) urea

The major nitrogenous excretory product in mammals is urea. Nitrogenous wastes in the body of animals tend to form toxic NH₃, which must be excreted. NH₃ is converted to urea in hepatocytes of the body.

Correct option  (C) Holocrine

Explanation:

Holocrine gland distingrate completely for discharge of secretion. 

Answer is : (a) deoxygenated blood to the lungs

Pulmonary artery arises from left ventricle and carries deoxygenated blood to the lungs.

The pulmonary artery begins in the heart at the base of the right ventricle.

Correct option (A) deoxygenated blood to the lungs

Explanation:

Pulmonary artery arises from left ventricle & carry deoxygenated blood to the lungs. 

Answer is : (d) Si

As element X is forming a stable product of the type XCl₄, so X must be tetravalent. Among the given elements Al is trivalent, Na is monovalent, Ca is divalent and Si is tetravalent.

Answer is : (c) refractive index of adhesive glue is close to that of glass

Frosted glass has a rough layer which causes irregular refraction and makes glass translucent.

When a transparent tape which has refractive index close to that of glass is pasted over the rough surface of glass, the tape glue fills the roughness of glass. This makes glass surface more smooth and so refraction is more regular. This makes region of tape transparent.

Steam causes more serious burns than that of water at 100°C because 1g of steam at 100°C imparts 2260 J of extra heat than the heat imparted by 1g of water at 100°C.

Answer is : (d) Transduction

Transduction is a method of gene transfer in bacteria from donor to recipient using bacteriophage. In transduction, at first bacteriophage infects donor bacteria and then carries some part of donor genome with it. When this bacteriophage infects new bacterial cell, it transfers that DNA into recipient cell.

Correct option(b)

Explanation:

2CH₃COOH + 2Na→2CH₃COONa +H₂ ↑

Answer is : (b) Sn

More reactive metal than Cu can precipitate copper from copper sulphate solution. The increasing order of reactivity of given element is

Au < Hg < Cu < Sn

As Sn is more reactive than Cu, so it would precipitate Cu from CuSO₄.

Correct option is (a) Statements I and III are correct

Streamlines may be straight or curved. In fluids, with low viscosity streamlined flow occurs only at low flow speed.

Answer is : (b) 1

It is given that for prime numbers p₁, p₂, p₃, p₄ the special prime number

p = p₁ + p₂ = p₃ - p₄

Case I

If all p₁, p₂, p₃, p₄ are odd, then (p₁ + p₂ ) and (p₃ - p₄) are even, which is not possible.

Case II

If one of p₁ and p₂ is even, say p₂ is 2 and p₄ must be 2.

So, p = p₁ + 2 = p₃ - 2

the above equation is satisfied only if

p = 5, p₁ = 3 and p₃ = 7

So, the number of special prime p is 1.

Correct option  (A) sugars, D-amino acids and L-amino acids 

Correct option  (A) the water will boil 

Explanation:

Because on earth there is no atmosphere. So water will boil. 

(At Boiling point vapour pressure = Atmospheric pressure, in open vessel)

The correct option is (A)  T₀ irrespective of the amplitude.

Explanation:

T₀ = 2 π √l/g

If θ is greater, then a < gθ 

Hence time-period T' > T₀.

Correct option  (A)

Explanation:

It has +ve & –ve overlap both simultaneous. So it leads to non-bonding overlap. 

Correct option is  (b) B

The reaction that is enzyme-catalysed has lower activation energy and is represented by the dotted line. The energy input required to raise the energy of the reactants to a certain level before the reaction is triggered is called the activation energy. This is represented by the increase in energy of the reactants to the top of the ‘hill’, B.

Correct option is (a) leprosy

Treponema pallidum pathogen is a cause of syphilis. It is a sexually transmitted infection that causes infected sores, blisters or ulcers on your genitals, anus (bottom) or mouth.

Correct option is (b) 3.125 x 10^-2 

Correct option  (D) 3-phosphoglycerate 

Explanation:

During Calvin cycle, the ¹⁴CO₂ is incorporated with a 5C compound Ribulose 1-5 Biphosphate and forms 2 molecules of 3C compound 3-phosphoglycerate.

Correct option (B) highly malleable 

Explanation:

Very thin foil can be made only of highly malleable material. 

Correct option (C)

Explanation:

Speed of particle doing SHM decrease as it go away from mean position. Time during which particle remain in extreme position will be longer. 

(A) electric field of constant magnitude and varying direction. 

Correct option: (A) along vector →_A  

Answer is : (d) 400

A dipeptide is made up of 2 amino acids which may be same or different. The total possible number of different dipeptides that may be assembled from 20 different amino acids will thus be

20ⁿ = 20² = 20 x 20 = 400

Correct option is (b) Chelicerata

Horse-shoe crabs are marine and brackish water arthropods. They resemble crustaceans but belong to separate subphylum of the arthropods, i.e. Chelicerata. The entire body of the horse-shoe crab is protected by a hard carapace.

Answer is : (d) Cu

Metal with low reactivity can be extracted by heating ore in air. This process of extraction is known as roasting. Among the given metals, Cu has least reactivity, so it can be directly extracted by heating its ore in air.

2CU₂S + 3O₂ → 2Cu₂O + 2SO₂↑

Answer is : (a) P₂O₅

P₂O₅, As₂O₃ are acidic oxides, Sb₂O₃ is an amphoteric while Bi₂O₃ is basic oxide but P₂O₅ is most acidic among them all. This is because down the group, metallic character increases and metal oxides are more basic, thus the basicity of metallic oxides also increases.

Answer is : (c) N₂O

N₂O is a neutral oxide, which is neither acidic nor basic.

Answer is : (d) Na₂O

All the central atom of the given oxide belong to 2nd period, as we move from left to right in a period the basicity of oxide decreases.

∴ The order of increasing basicity of oxide would be P₂O₅ < SiO₂ < Al₂O₃ < Na₂O

Thus, the most basic oxide would be Na₂O.

Answer is : (c) 0.27 M

Given,

Number of moles of solute NaCl = 0.35 mole

Volume of the solution = 1.30 L

Molarity = (Number of moles of solute/Volume of solution in litres)

= 0.35/1.30 = 0.269 ≈ 0.27 M

Answer is : (d) (ρ, T, p)

Intensive variables are those variables which don’t depend upon the quantity or size of matter. Among the given quantities density, temperature and pressure are intensive variables whereas heat capacity, enthalpy and volume are an extensive variables.

Answer is : (c) I, III and IV

Intensive properties are those properties which do not depend upon the quantity or size of matter. Among the given quantities, boiling point (I), pH (III) and emf (IV) are intensive properties whereas entropy (II) is an extensive property.

Answer is : (d) Wuchereria bancrofti

Filariasis is caused by Wuchereria bancrofti. It lives in lymphatic vessels and causes swelling of lower limbs and scrotum. Entamoeba histolytica causes amoebiasis. Plasmodium falciparum causes malaria. Trypanosoma brucei causes African sleeping sickness.

Answer is : (c) Only (iii)

The more positive E° value of metal, feasible transformation can be carried out by using HI as reducing agent under acidic conditions.

As E° = 0.77 V(Fe³⁺ → Fe²⁺) is more positive than, E° = 0.54(I₂(s) → 2I⁻) thus can be used for carrying out transformation as it is the strongest oxidising agent among the other given options.

Correct option is (d) mitochondrion

Mitochondria is referred as powerhouse of the cell. It contains the enzymes for cellular respiration. It oxidises carbohydrate to produce ATP molecules in the process of aerobic respiration.

Answer is : (a) more than 1 kW

Power P = V²/R as V remains constant in given condition, while current changes as resistance is reduced.

Power consumed by heater coil P ∝ 1/R.

On cutting part of coil, its resistance decreases. So, power consumed by coil increases and it will be more than 1 kW.

Answer is : (a)

Force of friction is self adjusting. When applied force is increased friction, first increases till it reaches a maximum value called limiting friction.

If applied force is further increased, then friction does not increases further and body begins to move.

Force of friction then remains constant and its value is given by

f = µN

Correct option  (B) 6

Explanation:

Sphere x² + y² + z² – 4x – 6x – 12z + 48 = 0

Centre (2, 3, 6)

radius = √(4 + 9 + 36 - 48) = 1

distance between centre and origin = √(4 + 9 + 36) = 7

shortest distance = 7 – 1 = 6 (Origin lies outside the sphere)

Correct option  (A) P-iii, Q-i, R-ii

Explanation:

Flame cells are for secretion and osmoregulation in flatworms.

Collar cells line spongocoel and cavars in sponges and creat water amount.

Cnidocytes are stringing cells and help in defense, affiance and capture of prey these cells also help in attachment with substrate 

Answer:  tetrahedral and 5

Explanation:

Mn²⁺ : [Ar]3d⁵ 

Br^– is weak field ligand.

Answer is : (c) 2 and 5

The molecular formula of hydrazine is NH₂NH₂.

From the structure, it is clear that it has 2 lone pairs and 5 bond pairs (4 N — H and 1 N–N).