Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Select the correct statements with respect to diseases and immunisation

  • if due to some reason B and T - lymphocytes are damaged, the body will not produce antibodies against a pathogen

  • injection of dead/inactivated pathogens causes passive immunity

  • certain protozoans have been used to mass produce hepatitis B vaccine

  • certain protozoans have been used to mass produce hepatitis B vaccine


A.

if due to some reason B and T - lymphocytes are damaged, the body will not produce antibodies against a pathogen

The primary and secondary immune responses are carried out with the help of two special types of lymphocytes present in our blood, i.e, B - lymphocytes and T- lymphocytes, The B- lymphocytes produce an array ( a range) of proteins in response to pathogens into our blood to fight with them. These proteins are called antibodies. The T- cells themselves do not secrete antibodies but the help B- cells to produce them.

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52.

Examine the figure below and select the right option giving all the four part (A, B,C and D) correctly identified.


  • A

    B

    C

    D

    Archegoni Ophore

    Female thallus

    Gemma cup

    Rhizoids

  • A

    B

    C

    D

    Archegoni

    Female thallus Bud Foot
  • A

    B

    C

    D

    Seta

    Sporophyte Protonema Rhizods
  • A

    B

    C

    D

    Seta

    Sporophyte Protonema Rhizods

A.

A

B

C

D

Archegoni Ophore

Female thallus

Gemma cup

Rhizoids

Marchantia, a liverwort, is dioecious. The female thallus bears female sex organs called archegonia on special branches called archegoniophores. The plant's body is anchored by unicellular rhizoids.

370 Views

53.

The logistic population growth is expressed by the equation

  • dt divided by dN space equals space Nr space open parentheses fraction numerator straight K space minus straight N over denominator straight K end fraction close parentheses
  • dN divided by dt space equals space rN space open parentheses fraction numerator straight K space minus straight N over denominator straight K end fraction close parentheses
  • dN/dt = rN

  • dN/dt = rN


B.

dN divided by dt space equals space rN space open parentheses fraction numerator straight K space minus straight N over denominator straight K end fraction close parentheses

A population growing in a habitat with limited resources show initially a lag phase, followed by phases of acceleration and deceleration and finally an asymptote when the population density reaches the carrying capacity. A plot of N (population density at time t) in relation to time (t) results in the sigmoid curve. This type of population grown is called  Verhulst -pearl Logistic Growth and is describes by the following equation:
dN divided by dt space equals space rN space open parentheses fraction numerator straight K space minus straight N over denominator straight K end fraction close parentheses

where N = population density at time t, 
r = Intrinsic rate of natural increase
K = carrying capacity


Since resources for growth for most animal populations are finite and become limiting sooner or later, the logistic growth model is considered a more realistic one.

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54.

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?

  • Two X - chromosomes 

  • Only one Y- chromosomes

  • Only one X - chromosome

  • Only one X - chromosome


A.

Two X - chromosomes 

The sex determining mechanism in case of humans is XY type. Sperms are of two types, one containing X -chromosome and another containing Y- chromosome.

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55.

Read the following four statements (I - IV) about certain mistakes in two of them

I .The first transgenic buffalo, Rosie produced mile which was human alpha - lactal bumin enriched

II. Restriction enzymes are used in isolation of DNA from another macro -molecules.

III. downstream processing is one of the steps of R-DNA technology.

IV. Disarmed pathogen vectors are also used in the transfer of R - DNA into the host. 

Which are the two statements having mistakes?

  • Statement (II) and (III)

  • Statements (III) and (IV)

  • Statements (I) and (III)

  • Statements (I) and (III)


D.

Statements (I) and (III)

Transgenic Rosiae is actually Cow. It is first transgenic cow produced in 1997.

Restriction enzymes cut the DNA at a specific site. The separation of DNA is performed by gel electrophoresis

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56.

Which one of the following is a wrong matching of a microbe and its industrial product, while the remaining three are correct? 

  • Yeast - statins

  • Acetobacter aceti - acid

  • Clostridium Butulicum - lactic acid

  • Clostridium Butulicum - lactic acid


C.

Clostridium Butulicum - lactic acid

Clostridium butulicum forms butyric acid

239 Views

57.

Good ozone is found in the 

  • mesosphere

  • troposphere

  • stratosphere

  • stratosphere


C.

stratosphere

The stratosphere is the second major layer of earth's atmosphere, just above the troposphere and below the mesosphere. It is the layer of ozone (O3). The ozone absorb high-energy UV-B and UV-C energy waves and breakdown into atomic Oxygen (O) and diatomic oxygen (O2).

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58.

In history of biology, human genome project led to the development of 

  • biotechnology

  • biomonitoring

  • bioinformatic 

  • bioinformatic 


C.

bioinformatic 

Human Genome Project (HGP) was closely associated with  rapid development of the new area in biology called a Bioinformatics, the science of collecting and analysing complex biological data such as genetic codes. 

322 Views

59.

Ureters act as urogenital ducts in

  • humans males

  • human females

  • frog's both males and females

  • frog's both males and females


D.

frog's both males and females

In the male frog, vasa efferential finally communicates with the urogenital duct tat comes out of the kidneys and open into claca. The cloaca is a small, median chamber that is used to pass faecal matter, urine and sperms to the exterior.

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60.

Which one of the following techniques made it possible to genetically engineer living organism

  • Recombinant DNA techniques

  • X -ray diffraction

  • Heavier isotope labelling

  • Heavier isotope labelling


A.

Recombinant DNA techniques

Recombinant DNA technology is joining together of DNA molecules from two different species that are inserted into a host organism to produce new genetic combinations.

251 Views