Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

31.

The genetic material in tobacco mosaic virus is

  • ss DNA

  • ss RNA

  • ds RNA

  • ds DNA


B.

ss RNA

Tobacco Mosaic Virus (TMV) is a positive sense single stranded RNA virus, that infects a wide range of plants. It contains single stranded RNA (ss RNA) as genetic material.


32.

Match column I with column II and select the correct option from the codes given below.

Column I Column II
A. Commensalism  (i) One inhibited, other unaffected
B. Parasitism  (ii) One benefitted, other unaffected
C. Mutualism (iii) Both are benefitted
D. Amensalism  (iv) One benefitted, other harmed

  • A - (iv), B - (ii), C- (iii), D - (i)

  • A - (iii), B - (iv), C - (ii), D - (i)

  • A - (ii), B - (iv), C - (iii), D - (i)

  • A - (ii), B - (iv), C - (i), D - (iii)


C.

A - (ii), B - (iv), C - (iii), D - (i)

Commensalism is an association between two organisms in which one benefits and the other derives neither benefit nor harm.

Parasitism is a relationship between species, where one organism, the parasite, lives on or in another organism, the host, causing it some harm and is adapted structurally to this way of life.

Mutualism is the way two organisms of different species exist in a relationship in which each individual fitness benefits from the activity of the other.

Amensalism is any relationship between organisms of different species in which one organism is inhibited or destroyed while the other organism remains unaffected.


33.

If both parents are carriers for thalassaemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected child?

  • 25%

  • 100%

  • No chance

  • 50%


A.

25%

Thalassaemia is an autosomal recessive disorder.

In the given case, both the partners are carriers for thalassaemia i.e., are heterozygous. Persons homozygous for thalassaemia suffer from severe haemolytic anaemia. Heterozygous persons are also not normal, but show the defect in a less severe form (thalassaemia minor). The probability of their progeny being affected with the disease i.e., with homozygous genotype is 25% only as shown below:

                           

Parents :    Tt × Tt

                     

Offspring: TT : Tt : tt

                 1 :  2 : 1

Normal- TT (25%)

Carriers- Tt (50%)

Affected- tt (25%)          


34.

Which of the following is used as bioinsecticide?

  • Bacillus polymyxa

  • Cylindrospermum licheniforme

  • Phytophthora palmivora

  • Chrysanthemum cinerarifolium


D.

Chrysanthemum cinerarifolium

Bacillus polymyxa and Cylindrospermum licheniforme are free living nitrogen fixing bacteria and cyanobacteria respectively. Phytophthora palmivora is a mycoherbicide. Pyrethrum is an insecticide obtained from the inflorescence of Chrysanthemum cinerarifolium.


35.

The correct sequence ofstages in the evolution of modern man (Homo sapiens), is

  • Homo erectus, Australopithecus, neanderthal man, cro-magnon man, modern man

  • Australopithecus, Homo erectus, neanderthal man, cro-magnon man, modern man

  • Neanderthal man, Australopithecus, cromagnon man, Homo erectus, modern man

  • Australopithecus, Neanderthal man, cromagnon man, Homo erectus, modern man


B.

Australopithecus, Homo erectus, neanderthal man, cro-magnon man, modern man

Australopithecus evolved around 4 million years ago in Eastern Africa.

Homo erectus evolved around 1.8 million years ago and lived throughout Pleistocene geological epoch.

Neanderthal man lived around 40,000 years ago. These are an extinct species of archaic humans in the genus Homo.

Cro- magnon man were found in the year 1868.

Modern man or Homo sapiens are found from the last 200,000 years.


36.

Match column I with column II and select the correct option from the given codes.

Column I Column II
A. Parthenocarpy (i) Seed formation without fertilisation
B. Polyembryony (ii) More than one embryo in same seed
C. Apomixis (iii) Seedless fruits without fertilisation
D. Somatic embryogenesis (iv) Embryo develops from a somatic cell

  • A- (iv), B- (ii), C- (iii), D- (i)

  • A- (iii), B- (ii), C- (i), D- (iv)

  • A- (i), B- (iv), C- (iii), D- (ii)

  • A- (ii), B- (iii), C- (i), D- (iv)


B.

A- (iii), B- (ii), C- (i), D- (iv)

Parthenocarpy is the development of a fruit without prior fertilization.

Polyembryony is the formation of more than one embryo from a single fertilized ovum or in a single seed.

Apomixis is the asexual reproduction in plants, in particular agamospermy.

Somatic embryogenesis is an artificial process in which a plant or embryo is derived from a single somatic cell.


37.

Identify the parts labelled A, B, C and D in the given figure and select the correct option.

  • A- Scutellum, B- Epiblast, C- Coleoptile, D- Coleorhiza

  • A- Scutellum, B- Coleorhiza, C- Coleoptile, D- Epiblast

  • A- Scutellum, B- Coleoptile, C- Coleorhiza, D- Epiblast

  • A- Epiblast, B- Coleoptile, C- Coleorhiza, D- Scutellum


C.

A- Scutellum, B- Coleoptile, C- Coleorhiza, D- Epiblast

Scutellum is a thin cotyledon in monocots found in the members of the grass family. It is situated towards one side of the embryonal axis. 

Coleoptile is a sheath protecting a young shoot tip in a grass or cereal.

Coleorhiza is a sheath protecting the root of a germinating grass or cereal grain.

Epiblast is a flap- like projection of the coleorhiza, inserted opposite the scutellum.


38.

Which of the following statements is correct regarding menstrual cycle?

  • LH induces rupturing of Graafian follicle

  • Proliferative phase is characterised by the increased production of progesterone

  • Corpus luteum secretes large amount of estrogen

  • Both LH and FSH attain a peak level in secretory phase


A.

LH induces rupturing of Graafian follicle

During follicular phase (proliferative phase), follicle stimulating hormone (FSH) secreted by anterior lobe of the pituitary gland stimulates the ovarian follicle to secrete estrogens. Corpus luteum secretes large amount ofprogesterone in secretory phase. Both LH and FSH attain a peak level in the ovulatory phase.


39.

Which of the following is the correct scientific name of wheat derived by binominal nomenclature?

  • Triticum Vulgare

  • Triticum aestivum

  • Oryza sativa

  • Zea mays


B.

Triticum aestivum

Triticum aestivum is the scientific name of Bread wheat commonly used at home. It is an annual grass that can grow up to 150 cm tall, usually producing 2- 5 tillers. It is one of the most important human food crops, providing a staple food for billions of people.


40.

Select the incorrect match.

  • Citric acid - Aspergillus niger

  • Streptokinase - Streptococcus

  • Butyric acid - Clostridium acetobutylicum

  • Cyclosporin A - Monascus purpureus


D.

Cyclosporin A - Monascus purpureus

Cyclosporin-A is a bioactive molecule, which is used as an immunosuppressive agent in organ transplantation. It is obtained through fermentative activity of fungus Trichoderma polysporum.