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Correct option  (D) They digest the DNA from free ends. 

Explanation:

Endonucleases do not cut from free ends.

Answer is : (a) Cellulose and glycogen

A carbohydrate (e.g. starch, cellulose or glycogen) is a molecule consisting of a number of sugar molecules bonded together by glycosidic linkages and on hydrolysis give its constituent monosaccharides or oligosaccharides. Cellulose is a polymer of β, D-glucose and glycogen of α, D-glucose. Glucose, fructose and ribose are monosaccharides.

Correct option  (D) It involves individuals of a population leaving a habitat during the time period under consideration. 

Explanation:

Emigration going out from one population

Correct option  (C)   1.6 μm

Correct option  (A) 20¹⁰⁰

Answer is : (b) 0.25 mol/L

Let the volume of HCl and H₂SO₄ be V [No. of moles = Molarity x Basicity x Volume]

Moles of H⁺ ions in HCl = 0.1 x 1 x V = 0.1 V

Moles of H⁺ ions in H₂SO₄ = 0.2 x 2 x V = 0.4 V

Thus, resulting moles of H⁺ ions in solution = (0.1+0.4) V = 0.5 V

Resulting volume of a solution = 2V

[H⁺] = Moles/Volume = 0.5V/2V = 0.25 mol/L

Correct option: (A) W₁ = W₂ = 0

Correct option: (B) decreases

Answer is : (c) Alleles

The term allele was formerly used by Mendel for the factors representing the two alternate forms of a character, e.g. tallness and dwarfness in case of height in pea (T and t).

Answer is : (a) April-May

This happens because the temperature starts to increase all over the country in March and by April. The interior parts of the peninsular record mean daily temperature of 30-35°C. Maximum temperature rises sharply exceeding 45°C by the end of May. The warm temperature can affect the ripening process of fruits and vegetables by speeding up the production of ethylene gas which rushes the ripening or fruiting process.

Answer is : (d) Owl

Owl’s eye have the widest angle of binocular vision among rat, duck and eagle. Binocular vision is the vision using two eyes with overlapping fields of view, allowing good perception of depth. Unlike many birds with eyes that sit at an angle, owl’s eye face directly forward giving them incredible binocular vision.

Although their large eyes cannot move or roll-like human eyes can, owls can move their heads nearly all the way around, allowing them to have a 270 degree range of vision without moving their bodies.

Correct option (A) a single bacterium by its repetitive division 

Explanation:

A bacterial colony on culture media is formed on repetitive division of bacterium.

Correct option  (C) Acetyl choline

Explanation:

Synaptic bulbs of axon have vesicles which are filled with acetylcholine. 

Correct option  (D) transversion 

Explanation:

Mutation of purine to purimidine is known as transversion. 8 possible transversion can occurs.

Correct option  (A) Leydig cells

Explanation:

Leydig cells or Interstitial cells of testes secretes testosteron hormone.

Correct option  (B) Photoperiodic response does not occur 

Explanation:

Leaves are the site for photoperiodic perception

Answer is : (a) are unable to utilise phenylalanine

Phenylketonuria is an autosomal recessive disorder with mutation in gene for enzyme Phenylalanine Hydroxylase (PAH), making it non-functional.

Phenylalanine \(\overset{PAH}{\underset{x}{\rightarrow}}\) Tyrosine

Such person cannot metabolise the above reaction leading to accumulation of phenylalanine. So, are given food low in phenylalanine and supplemented with tyrosine.

Correct option  (A) promoting glycogenolysis

Promote breakdown of Glycogen in liver.

Correct option  (A)  lowering the activation energy

Explanation:

Enzyme decreases activation energy in reaction

Correct option  (A) Restriction enzyme

Explanation:

RE is not required in PCR

Correct option  (B) it is transparent to sunlight but traps heat.

 Explanation:

Green house effect increases earth's temperature by trapping heat. 

Correct option  (B) Na⁺ and K⁺ pumps in the membrane. 

Explanation:

Energy derived pumps are present in plasma membrane.

Correct option  (A) linear 

Explanation:

log S = log c + z log A

Correct option  (C) During exercise the parasympathetic control decreases

Explanation:

Parasympathetic control decreased during exercise.

Correct option is (c) ABA

Gibberellins and ABA are antagonistic to each other. Gibberellins promote seed germination whereas ABA promotes seed dormancy.

Answer is : (c) Size of the nucleus is comparable to the atom

In Rutherford model, positive charge acquires a very small place at centre of atom in nucleus.

Answer is : (a) bend in the same direction

Neutral objects are always attracted towards both positively and negatively charged objects. So, water stream still bends in same direction.

Correct option is (c) Total number of nodes for 3s-orbital is three

Answer is : (a)

A lunar eclipse occurs only on a full moon day. So, option (a) is incorrect.

Answer is : (b) T increases first and then decreases

Time period of a pendulum depends on its length as

T ∝ √I

where, l = length of pendulum.

As water flows out of the bob of pendulum, centre of mass of bob go down as the level of water falls. But when bob is completely emptied, centre of mass of bob again reaches to its centre. Hence, effective length of pendulum first increases then decreases.

So, time period of pendulum first increases then decreases.

Correct option: (A) 81

Correct option is (b) negatively charged

DNA fragments are negatively charged molecules. The reason why DNA is negatively charged is the phosphate (\(PO^{2-}_4\)) group that constitutes every nucleotide. 

During the formation of phosphodiester bond, nucleotides retain one of the two negative charge, while the other is lost to form ester bond to new pentose.

Correct option (D) nearly equal to g

Explanation:

At earth surface acceleration due to gravity 

g =GM/R²

At height = 9000 m, Radius of orbit of ball is 6400 + 9 km

⇒ radius r > R

Radius is almost equal to radius of earth.

(v) orbital velocity of ball = √GM/r

Acceleration = v²/t ⇒GM/r²

as r is very near to R

 ∴  Acceleration = GM/R² = g

Correct option  (C) 3.3 x 10⁷ Pa

Explanation:

When some body is constrained from expanding or bending then on heating thermal stress get develop in the body.

Stress = Y αΔT =

2 × 10¹¹ x 1.1 x 10^–5 x (40 – 25)

= 3.3 × 10⁷ N/m² 

= 3.3 x 10⁷ Pa

Correct option  (A) around regions such as A 

Explanation:

Diamagnetic material move from high magnetic field to low magnetic field so this material are likely to accumulate over the region such as A as here magnetic field is minimum. 

Correct option  (A)

Explanation:

For exothermic reaction 

ΔH = EP – ER < 0

EB – EA < 0

E_B < E_A

Catalyst does not changes the initial and final position of the reaction so correct answer is (A)

Correct option (D) Collenchyma

Explanation:

The stalk of plant leaf (petiole) is reinforced by collenchyma.  

Correct option  (D) Receptor → Spinal cord → Muscles 

Explanation:

Reflex arch Receptor → Sensory Neuron → Spinal cord → Motor neuron → Muscle [Effector] 

Answer is : (c) Renal cortex

Proxima and distal convoluted tubules are located in renal cortex. Convoluted means the tubules one tightly coiled. Proximal convoluted tubules are associated with the reabsorption of filtered water, Na⁺, K⁺. glucose, amino acid, Cl⁻, HCO₃⁻, Ca²⁺, Mg²⁺ and secretion of H⁺, NH⁺₄, urea whereas distal convoluted tubules are associated with reabsorption of water, Na⁺, Cl⁻ and Ca²⁺.

Correct option: (D) 4/3 gram mole

Explanation: 

4Al + 3MnO₂ → 3Mn + 2Al₂O₃

To reduce 3 moles of MnO₂ required moles of Al = 4

So, for one mole of MnO₂ required moles of Al will be

= 4/3

Correct option(b)

Explanation:

E⁰_red = Sn < Cu < Hg < Au

Answer is : (a) several amino acids are coded by more than one codon

There are 64 codons present in each living organism, out of which, 61 codons represent or code for amino acids and rest three are stop codons. Thus, there are more codon combinations than there are amino acids. The genetic code is described as degenerate because more than one codon sequence can code for the same amino acid.

Answer is : (d) the DNA is replicated

In cell cycle, during interphase, the DNA is replicated. Interphase begins with G₁ -phase. During this phase, the cell makes a variety of proteins that are needed for DNA replication. G₁ -phase is followed by synthetic or S-phase. This phase is responsible for the synthesis or replication of DNA. The aim of this process is to produce double the amount of DNA, providing the basis for the chromosome sets of the daughter cells.

Answer is : (a) gene flow

Gene flow is the transfer of genetic variation from one population to another. Genetic drift is a change in the frequency of an allele within a population over time. Speciation is the formation of new and distinct species in the course of evolution. Genetic shift is a major change within a population which changes the population altogether.

Answer is : (c) They are membrane-bound organelle

Nucleosome is a structural unit of a eukaryotic chromosome, consisting of a length of DNA coiled around a core histone. Thus, nucleosome is not a membrane bound organelle of a cell.

Answer is : (a) ATP and NADPH

The light dependent reaction of photosynthesis uses light energy to make two molecules needed for the next stage of photosynthesis. These include the energy storage molecule ATP and the reduced electron carrier NADPH. The light reaction takes place in the thylakoid membranes of chloroplasts.

Answer is : (a)

As centre of mass is subjected to a downward external force only, so its motion is along the direction of external force, i.e. downwards. Any internal force does not change position of centre of mass.

Answer is : (a) 1

A normal human inherits only one sex chromosome (either X or Y chromosome) from father. Sex chromosomes, determine whether an individual is male or female. In human and other mammals these are designated by scientists as X and Y. In humans, the sex chromosomes comprise one pair of the total of 23 pairs of chromosomes. The other 22 pairs of chromosomes are called autosomes.

Answer is : (d) one round of DNA replication and two divisions

For a complete meiotic cell division, there takes place one round of DNA replication during the S-phase and two divisions. This is because meiosis is a process where a single cell divides twice to produce four cells containing half the original amount of genetic information.

Answer is : (a) Fe(OH)₂, CH₃OH

An ionic compound is formed when metal and a non-metal reacts whereas covalent compound is formed when 2 non-metals react with each other. In the given options, Fe(OH)₂, Ca(OH)₂ and Cu(OH)₂ are ionic while CH₃OH, CH₃CH₂OH are covalent.

Thus, the correct pair in which first compound is ionic and the second compound is covalent is given in option (a).