Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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41.

Assertion: A middle aged woman is reported to have small breasts and undersized uterus.

Reason: Her genotypic analysis shows XO condition of allosomes.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

Females having 45 chromosomes (2A + XO) are affected with Turner's syndrome. Individuals having Turner's syndrome have female sexual differentiation but ovaries are rudimentary. Other associated phenotypes of this condition are short stature, webbed-neck, broad chest, lack of secondary sexual characteristics and sterility. Thus, any imbalance in the copies of the sex chromosomes may disrupt the genetic information necessary for normal sexual development.


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42.

The 'cells of Rauber' are

  • secretory cells of endometrium in uterus

  • inner cell mass of blastocoel 

  • outer cells of trophoblast in contact with uterine wall

  • cells of trophoblast, in contact with inner cell mass of blastocyst.


43.

Which is correctly labelled with respect to the given diagram

  • B: Logistic curve

  • C: Carrying capacity

  • C: Exponential curve

  • A: Carrying capacity


44.

Choose the correct statement.

  • hPL plays a major role in parturition.

  • Foetus shows movements first time in the 7th month of pregnancy.

  • Signal for parturition comes from fully developed foetus and placenta.

  • Embryo's heart is formed by the 2nd month of pregnancy.


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45.

Which one has the largest species variety in India

  • Wheat

  • Maize

  • Rice

  • Potato


46.

Cattle ranches are known to causes acute green house effect. This is due to

  • mechanized milking practices

  • methanogenic bacteria in rumen

  • decomposition of left over fodder

  • decomposition of organic remains in faeces.


47.

Select the option having all the correct characteristics.

  •  Structure    Percentage    Function

  •   Structure    Percentage    Function

  •   Structure    Percentage    Function

  •   Structure    Percentage    Function


48.

Plants with inferior ovary usually bear

  • pseudocarps

  • berries

  • aggregate fruits

  • seedless fruits


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49.

The extinct human ancestor, who ate only fruits and hunted with stone weapons was

  • Ramapithecus

  • Australopithecus

  • Dryopithecus

  • Homo erectus.


50.

Beads on string like structures of A are seen in B, which further condense to form chromosomes in C stage of cell division

  •            A              B             C

    Chromonema Chromatin Metaphase

  •         A              B             C

    Chromatin Chromatid Metaphase

  •            A              B             C

    Chromonema Chromosome Anaphase

  •            A              B             C

    Chromonema Chromatid Anaphase.


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