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Correct Option (b) Neoilina

Correct Option (b) Colloidal theory 

Correct Option (a) C₂H₅OH, C₂H₅ONa, C₂H₅Cl

Explanation: 

C₂H₅OH(A) + Na → C₂H₅ONa(B)

C₂H₅OH(A) + PCl₅ → C₂H₅Cl(C)

C₂H₅ONa(B) + C₂H₅Cl (C) → C₂H₅OC₂H₅ + NaCl

Correct option (b) 2 

Explanation:

Only two electrons of an atom have n = 3 and m = 2.

Correct Option (a) I < II < III 

Explanation:

Higher the electronegativity between C—X, higher will be dipole moment .

Answer is : (a) a gene for an enzyme that synthesises a chemical toxic to weevils has been transferred

In pest-resistant legumes, a gene for an enzyme that synthesises a chemical toxic to weevils has been transferred from Bacillus bacteria to the Rhizobium bacteria that live in the root nodules of these plants.

The correct option is (C) Molecular analysis of profiles of DNA samples.

Explanation:

DNA fingerprinting is a modern technique that compares sets of DNA by locating identical sequences of nucleotides, often for purposes of forensic identification.

Correct option (2) a, b and c

Explanation

Dominance, codominance and multiple alleles are the characteristics that represent 'inheritance of blood groups' in humans. ABO blood groups are determined by the gene I. There are multiple (three) alleles; I^A, I^B and I⁰ of this gene. Allele I^A and I^B are dominant over I⁰. However, when I^A and I^B aIIeles are present together, they show codominance.

Therefore, option (2) is correct.

Answer is : (d) Crinoidea

Crinoidea is a class of stalked and sedentary echinoderms.

Answer is : (d) I, II and III

Hydroponics is a technique of growing plants in a nutrient solution. Hydroponics have been successfully employed as a technique for the commercial production of vegetables such as tomato, seedless cucumber, etc. Thus, this technique facilitates the production of seasonal vegetables. It also avoids soil borne pathogens. However, the cost of these experiments is high and also requires skilled people to perform it.

Klinefelter’s Syndrome is an aneuploid condition marked by the presence of one or more extra chromosomes in a male (44 + XXY/ 44 + XXXY/ 44 + XXXXY). As we know that, to compensate the dosage of X-linked genes in human male and female, one X-chromosome in females is deactivated and is present as darkly stained body near nuclear envelope. The number of Barr bodies is always one less than the total number of X chromosomes. A human male with Klinefelter’s syndrome, 44 + XXY/ 44 + XXXY/ 44 + XXXXY, can have 1, 2 or 3 Barr bodies, depending on the number of X-chromosome. The presence of extra copy of X-chromosome produces some feminine characters in otherwise male individuals. They are sterile feminised males with enlarged breasts (Gynecomastia).

Correct Option (a) 1.93 x 10⁵ sec

Explanation

2H₂O → 2H₂ + H₂

1 mole of H₂O exchanges 2 moles of electrons, then 2 moles of H₂O will exchange 4 moles of electrons. = 4 × 96500 coulomb

=4 x 96500/2sec

= 1.93 x 10⁵ sec.

Correct option (b) NH₃ < en < CN^– < CO

Explanation:

Based on spectrochemical series, ligands arranged in increasing order of crystal field strength are as NH₃ < en < CN^– < CO

Correct Option (d) calcination

Explanation : 

Roasting is heating in the presence of air.

Correct Option (d) All of the above

Explanation

All of them on being reduced will get either stable half-filled orbitals or stable completely filled orbitals.

Answer is : (d) C₂H₆I and C₂H₅OH

C₂H₆I and C₂H₅OH pair will not form ideal solution. Here, C₂H₅OH will show H-bonding as well as polarity both.

The correct answer is (2)

Cork cambium undergoes periclinal division and cuts off thick walled suberised dead cells towards outside i.e. phellem (cork) and it cuts off thin walled living cells i.e., phelloderm on inner side.

The correct answer is (2)

 Corpus luteum is the temporary endocrine gland formed in the ovary after ovulation. It release hormones like progesterone, oestrogen etc.

The correct answer is (1)

The correct sequence of events occur during mitosis would be as follows
(i) DNA condensation occurs so that chromosomes become visible during early to mid-prophase.
(ii) Disassembly of nuclear membrane begins at late prophase or transition to metaphase.
(iii) Chromosomes align at equator during metaphase.
(iv) Centromere division occurs during anaphase forming daughter chromosomes.
(v) During anaphase segregation also occurs in which daughter chromosomes separate and
move to opposite poles.
(vi) Telophase finally leads to formation of two daughter nuclei

The correct answer is (1)

The various stages of processing that occur after the completion of fermentation or biosynthetic stage which include separation and purification of product called downstream processing.

Correct option (4) Phospholipid synthesis

Explanation

Phospholipid synthesis does not occur in RER. It occurs inside Smooth Endoplasmic

Reticulum ( SER). A signal peptide is a short peptide present at the N-terminus of the newly synthesised proteins. It targets them to the ER and is then cleaved off. RER synthesises proteins. It bears enzymes for modifying polypeptides synthesised by attached ribosomes, e.g. glycosylation.

The correct option is(1) AGGUAUCGCAU

Explanation:

Coding strand is the one that codes for mRNA. It has same nucleotide sequence as that of mRNA except thymine (T) is replaced by uracil (U) in mRNA. Hence, the corresponding sequence of transcribed mRNA by template or non-coding strand (complementary to RNA) is AGGUAUCGCAU.

Correct option (1) Polysome

Explanation

Polysome is a string of ribosomes associated with a single mRNA. polysome helps to produce a number of copies of the same polypeptide. Nucleosome is the unit of eukaryotic DNA that consists of a DNA segment wrapped around a core of eight histone proteins. Nucleosome chain gives a 'beads on string'appearance under electron microscope. plastidome refer to all the plastids of a cell which work as a functional unit.

Polyhedral bodies or carboxysomes are present in several groups of autotrophic bacteria that assimilate inorganic carbon via Calvin cycle, e.g. Cyanobacteria.

The correct option is(2) Chelone

Explanation:

Among the given animals Chelone is not a homeotherm. It is green sea turtle belonging to class-Reptilia which are ectotherms or cold-blooded and their internal body temperature varies according to the ambient environment.

In contrast, Camelus and, Macropus belonging to Class-Mammalia and Psittacula belonging to class-Aves are homeotherms. They can maintain constant body temperature irrespective of the surrounding temperature.

The correct option is(1) Earthworm

Explanation:

All the given animals except earthworm undergoes metamorphosis. Earthworm exhibits direct development where no larval stage is involved.

Metamorphosis is usually seen in animals exhibiting indirect development, involving a larval stage which Iater transformed into an adult. 

Larval form of moth is caterpillar and that of tunicates is tadpole.

In starfish, bipinnaria larva occurs.

Answer is : (a) (A) has tetrahedral structure, (B) has square planar structure

Correct option is : (b) 32 N

Let a be the acceleration of each block, then

T₃ = (m₁ + m₂ + m₃)a … (i)

and T₂ = (m₁ + m₂)a … (ii)

From Eqs. (i) and (ii), we get

T₂ \(=(\frac{m_1+m_2}{m_1+m_2+m_3})\times T_3\)

\(=(\frac{10+6}{10+6+4})\times 40\)

= 32 N

Correct option (c) Cl > F > Br > I 

Explanation:

As we go down the group in Periodic Table, atomic size increases, force of attraction for the added electron decreases, hence electron gain enthalpy decreases.

X(g)+e^- → X^-(g)

Actual order is Cl > F > Br > I 

The fact that fluorine has a less electron gain enthalpy than chlorine seems to be due to the relatively greater effectiveness of 2p-electron in the small F-atom to repel the additional electron entering the atom than do 3p-electrons in the larger Cl-atom.

Correct Option (c) CH ≡ CH

Explanation :

If CH ≡ CH were to dissolve in H₂SO₄ a bisulphite salt of vinyl carbocation H₂C = C+H would be formed. The more s-character in the pos itively charged 'C' , less stable is the carbocation and less likely to be formed.

Correct option (a) 6 g 

Answer Is : (a) oxides are easier to reduce

The sulphide ore is converted to oxide before reduction because oxides are easier to reduce. 

In this way, ore conversion is suitable for reduction.

Answer is : (d) Victor Meyer’s method

Victor Meyer’s method is used to distinguish between primary, secondary and tertiary alcohols. By identifying the colour produced, the alcohols are identified. Rest all the other methods given are used to distinguish between primary, secondary and tertiary amines.

Answer is : (b)

The structure A is centriole, which helps in assemblage of meiotic spindle fibres at both ends. The stage of cell division is Anaphase-I. Here the homologous chromosomes separate, with sister chromatids remaining attached to each other.

Correct Option (b) mL²/12

Explanation: 

I =  I₁ + I₁  = I = 0 + ML²/12  = I = ML²/12​​​​​​​

Correct Option  (c) 1 m/s 

Explanation: 

M = m₁ + m₂

AV₁ = AV₂ = 1.5 AV

A x 3 = A x 1.5 + 1.5AV = V = 1m/s

Correct Option (c)

Correct Option (c) I and IV 

Correct Option (b) Substrate, which accept the CO₂ molecules

Correct Option  (c)

Correct Option (c) DNA ⇄RNA  → Protein

Correct Option (a) Ψ_w = Ψ_m+Ψ_s+Ψp

Answer is : (a) catabolite repression

Catabolic repression is a system of gene control in some bacterial operons in which glucose is used preferentially and the metabolism of other sugars is repressed in the presence of glucose.

Catabolite repression allows microorganisms to adapt quickly to preferred carbon/energy source (like glucose) first. This is achieved through inhibition of synthesis of enzymes involved in catabolism of carbon sources.

Answer is : (d)

Population of organisms evolves to maximise their reproductive fitness, i.e. Darwinian fitness in the habitat in which they live, under a particular set of selection pressures. Organisms evolve towards most efficient reproductive strategy. Life history traits of organisms have evolved in relation to the constraints imposed by components of habitat in which they live.

Answer is : (a) 2C 

v = \(\frac{1}{\sqrt{LC}}\)

When L is changed to L/2, 

C must be changed to 2C to keep v same.

The correct answer is (1)

 Volvox is motile colonial fresh water green alga. It forms spherical colonies.

The correct answer is (2)

During anaphase, Anaphase Promoting Complex (APC) is a protein necessary for separation of daughter chromosomes. A defective APC will cause the chromosomes fail to segregate during anaphase.

The correct answer is (3)

The site of aerobic oxidation of carbohydrates in cells to generate ATP are mitochondria.

The correct answer is (4)

In human, 12 pairs of ribs are present out of which 7 pairs of ribs (1st to 7th pair) are dorsally attached to vertebral column and ventrally to the sternum.

The correct answer is (3)

 Mycorrhizae is a symbiotic association between fungi and roots of higher plants.