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Answer is : (c) low side effects and high contraceptive value

Oral contraceptive pill is a popular method of contraception used by females. They work by inhibiting ovulation and implantation.

‘Saheli’ is a new oral contraceptive pill for females that contain a non-steroidal preparation. It is once a week pill with very few side effects and high contraceptive value.

Correct option (a) A    

Explanation:

Vitamin A is a group of unsaturated nutrional organic compounds, that includes retinol, retinal, retionic acid and several provitamin A carotenoids, among which beta caroteen is the most important. Vitamine A is teh vitamin whose deficiency may cause night blindness.

Correct Option(1) Ribozyme - Nucleic acid

Explanation:

Ribozymes are RNA molecules having enzymatic activity, i.e. they are capable of catalysing specific biochemical reactions. Hence, they are nucleic acids with enzymatic function.

TH Morgan is known as the 'Father of Experimental Genetics'. He worked on linkage, crossing over, linkage maps. etc.

In dihybrid cross, two allelic pairs are used for crossing.

Mendel is considered as the 'Father of Genetics'. He proposed the laws of inheritance.

Answer is : (b) 1.73

According to given question, r = 60º = i

Given, condition satisfies Brewster’s law,

\(\therefore \mu =tan\,i_p(i_p=i)\)

= tan 60º = √3

= 1.73

Correct option (a) minimum at R     

Explanation:

As electric potential decreases in direction of electric field.

∴ V_P > V_Q > V_R

Potential is minimum at R.

Answer is : (b) Erwinia uredovora

Golden rice is a β-carotene enriched variety of Oryza sativa. It was created by transforming rice with two β-carotene biosynthesis genes, psy and crtl. The crtl gene was isolated from the soil bacterium, Erwinia uredovora.

Answer is : (b)

Hepaticopsida has capsule without any columella.

In Anthocerotopsida, sterile columella is present.

In Bryopsida, sporophyte is well-differentiated into foot, seta and capsule.

Marchantiales includes Riccia.

Answer is : (a) cobalamine

Vitamin-B₁₂ or cyanocobalamin is a cobalt containing vitamin found in meat, liver and fish. It promotes DNA synthesis and maturation of RBCs. The absorption of cobalamin in the intestine requires the action of a glycoprotein, Castle’s intrinsic factor.

Answer is : (c) Only III

Maintenance of favourable dynamic constancy is called thermoregulation, while maintenance of constant internal temperature by an organism is called homeostasis. The oldest living plant on earth is bristle cone pine of California.

Correct Option (b)

Correct Option (c) II and III 

Correct Option (c) Ichthyostega 

Correct Option (c) energy is expended 

Correct Option (d) Pancreatic polypeptide

Answer is : (d) 150° C

For resistance thermometers

\(t=\frac{R_t-R_{0^\circ}}{R_{100}-R_{0^\circ}}\times100^\circ\,C\)

\(t=\frac{9}{6}\times100=150^\circ\,C\)

Answer : (d) I and III

Statements I and III are correct, while statement II is incorrect. 

This can be corrected as : 

The slow block polyspermy develops in response to the formation of fertilisation membrane and polyspermy is the process of entry of more than one sperm into the oocyte.

Correct Option (a) Oxygen 

Explanation :

O₂ has two unpaired electrons

Answer is : (d) NO₂

Concentrated nitric acid upon long standing turns yellow brown. This is due to the formation of brown coloured gas (NO₂).

\(4HNO_3\rightarrow 2H_2O + 4NO_2 + O_2\)

Answer is : (b) Acetyl Co-A

Acetyl Co-A is the intermediate compound that links glycolysis to Krebs cycle. The end product of glycolysis is pyruvate. It is converted into acetyl Co-A before it enters the Krebs cycle.

Correct Option (d) oxidative decarboxylation

The correct option is(1) ectoderm and mesoderm

Explanation:

Amnion of mammalian embryo is derived from ectoderm and mesoderm. It is one of the extraembryonic membranes which is formed by the amniogenic cells of ectodermal origin on the inner side and somatopleuric extraembryonic mesoderm on outer side. This membrane acts as a shock absorber for the foetus, regulates foetal body temperature and prevents desiccation.

The origin of other extraembryonic membranes is as follows

• Chorion Trophoectoderm and mesoderm.
• Allantois and Yolk sac Outer mesoderm and inner endoderm.

Correct Option (c)

Explanation :

The reaction occurring in two steps has two activation energy peaks. The first step being fast needs less activation energy. The second step being slo, needs more activation energy. Therefore, second peak will be higher than the first.

(3) Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile

Answer is : (d) prolactin release inhibiting hormone

Prolactin release inhibiting hormone is a polypeptide hormone produced in the hypothalamus.

Growth or somatotropin hormone and adrenocorticotropic hormone is secreted by adenohypophysis.

Correct option (4) Eye of octopus, bat and man

Explanation

Divergent evolution results in homologous structures. These organs have the same fundamental structure but are different in functions. Structural homology is seen in brain, heart and forelimbs of man, bat and cheetah.

Eyes of Octopus, bat and man are examples of analogous organs which show convergent evolution. Therefore, option (4) is incorrect.

The correct option is : (a) -NR₂ < -OR < -F 

Explanation:

The electronegativity of F, O, and N follows the order: N < O < F

Therefore the negative inductive effect of - NR₂, -OR and -F follow.s the order:

-NR₂ < -OR < - F

Correct option [c] Acquired variations 

Correct Option (d) Y–chromosome

Correct Option (a) holandric genes 

Correct Option (c) Na⁺² 

Answer is : (b)

Real time PCR utilises SYBR green for detection and estimation of DNA products. SYBR green is a cyanine dye used to stain DNA. It binds with DNA molecules by intercalating between the DNA bases.

Answer given below:

https://bit.ly/2V5vJEs

Correct Option (c) Quick lime 

Explanation :

NH₃ reacts with rest all

Correct Option (b) allantois, chorion 

Correct option [a] sarcomere 

Correct Option (b) inner ear

Correct Option  (b) single stranded RNA

Correct option [d] all of these

Correct option [d] PEP-carboxylase

Correct Option (a) fat s are catabolised in adipose tissues to form glucose

Correct option [b] citric acid, isocitricacid and and oxalosucciic acid 

Correct option [d] pigeon

Correct option [b] liver 

Correct Option (b) return the interstitial fluid to the blood

Correct Option (b) Purine metabolism.

Correct Option  (c) are sensititve to SO₂

Correct option [b] RNA polymerase II

The correct matches are given by option (c).

DNA ligase joins the ends of DNA segments. It catalyses the covalent bonds of segments of an interrupted sugar phosphate strands in ds DNA. DNase I is an endonuclease that digests ds or ss DNA.

DNA topoisomerse relieves torque or strain.

DNA helicase unwinds the double helix.

Answer is : (b) rho factor

In some prokaryotes, rho factor helps in dissociating RNA from polymerase and template DNA, terminating transcription. This type of transcriptional termination is called rho-dependent termination.

Answer is : (c) gibberellins, released by the embryo

Aleurone layer secretes amylase and protease enzyme which cause breakdown of starch and protein to simpler substances to be utilised during germination. Gibberellins released by embryo stimulate amylase and protease secretion at aleurone layer.