Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Which one of the following human ancestors is known as tool maker?

  • Homo erectus

  • Java man

  • Homo habilis

  • Heidelberg man


C.

Homo habilis

Homo habilis was also known as toolmaker because it was the first human who made weapons and tools from rocks.


42.

Consider these following sentences and choose the correct ones.

(I) Each gene contains a specific promoter region and a leader sequence for guiding the beginning of transcription.

(II) Only one strand of DNA, called template strand is copied by RNA polymerase this strand runs in 3ʹ → 5ʹ direction.

(III) RNA polymerase adds complementary nucleotides forming single strand mRNA in 3ʹ → 5ʹ direction.

(IV) Section of DNA that has been transcribed is rewound into its original configuration.

  • II, III and IV

  • II and IV

  • I, II and IV

  • I, II, and IV


D.

I, II, and IV


43.

Which one of the following antibodies play an important role as mediator in allergic response?

  • IgE

  • IgG

  • IgD

  • IgA


A.

IgE

Antibody IgE acts as the mediator in an allergic response.


44.

During meiosis-I, the bivalent chromosomes clearly appear as tetrads during

  • Diakinesis

  • Diplotene

  • Pachytene

  • Zygotene


C.

Pachytene

During meiosis-l, in pachytene phase of prophase-l, the bivalent chromosomes clearly appear as tetrads for crossing over.


45.

Which one of the given pollination technique/adaptation is different than others?

  • Herkogamy

  • Geitonogamy

  • Dichogamy

  • Heterostyly


B.

Geitonogamy

Geitonogamy is a technique of self-pollination, in which pollen of one flower is deposited on the stigma of another flower of the same plant. While others are mechanisms adopted by bisexual flowers to avoid self-pollination and promote Cross-pollination.

• Dichogamy The condition where the maturing time of anther and stigma is different. Anther matures first, i.e.protandry, stigma matures first, i.e. protogyny.
• Herkogamy Includes mechanical barrier in flower to ensure cross-pollination.
• Heterostyle The height of stigma and Anther is different to avoid self-pollination.


46.

In animals normally which organism has a maximum number of chromosomes?

  • Butterfly

  • Elephant

  • Hermit crab

  • Chimpanzee


A.

Butterfly

Butterflies have most numbers of a chromosome in animal kingdom about 380.


47.

A point mutation where guanine is replaced by cytosine is also called

  • Frameshift mutation

  • Transition mutation

  • Translocation mutation

  • Transversion mutation


D.

Transversion mutation

The base pair mutations are the most common type of mutations. These can be further categorised into two types

(a) Transitions, i.e. in which a purine base is replaced by another purine and pyrimidine is replaced by
another pyrimidine.

(b) Transversion, ie those in which a purine (guanine) is replaced by a pyrimidine (cytosine) and vice-versa.


48.

Snapdragon flower is an exception of Mendel’s laws. It is a good example of

  • Law of dominance

  • Complementary gene

  • Codominance

  • Incomplete dominance


D.

Incomplete dominance

4 O'clock and snapdragon flower are the best examples of incomplete dominance wherein heterozygous condition pink flowers are produced from white and red parents. It is an exception to Mendel's law of dominance.


49.

The phenotypic ratio of trihybrid cross in F2-generation is

  •  27: 9: 9: 9 : 3 : 3 : 3: 1

  • 9 : 3 : 3 : 1

  • 1 : 4 : 6 : 4 : 1

  • 27 : 9 : 3 : 3 : 9 : 1 : 2 : 1


A.

 27: 9: 9: 9 : 3 : 3 : 3: 1

The phenotypic ratio of trihybrid cross in Fz-generation will be 27:9:9:9:3:3 :3:1.


50.

Which one of the following is a matching pair of vector and the disease?

  • Culex – Filariasis

  •  Housefly – Leprosy

  • Aedes aegypti – Chickenpox

  • Sandfly – Cholera


A.

Culex – Filariasis

Culex mosquito is responsible for carrying pathogen of filariasis as the vector. A housefly is a vector for amoebiasis, typhoid, etc. Aedes aegypti mosquito is a vector for dengue virus. Sandfly is a vector for kala-azar.