Subject

Biology

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

91.

Given below is a diagrammatic cross section of a single loop of the human cochlea.

diagram

Which one of the following options correctly represents the names of three parts? 

  • B: Perilymph
    C: SPerilymph
    D: Secretory Cells
  • C :Endolymph
    D : Sensory hair cells
    A: Serum

  • D: Sensory hair cells 
    A: Endolymph
    B: Tectorial membrane

  • D: Sensory hair cells 
    A: Endolymph
    B: Tectorial membrane


D.

D: Sensory hair cells 
A: Endolymph
B: Tectorial membrane

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92.

Consider the following four statement (A-D) about certain  desert animals such as kangaroo rat

A) they have a dark colour and high rate of reproduction and excrete solid urine.
B) they do not drink water, breathe at a slow rate of conserve water and have their body covered with thick hairs.
C) they feed on dry seeds and do not require drinking water.
D) they excrete very concentrated urine and do not use water to regulate body temperature.

Which two of above statement for such animals are true? 

  • C and D

  • B and C

  • C and A

  • C and A


A.

C and D

Kangaroo rat is a desert rodent. Its body is covered by hairs. Its urine is more than 20 times concentrated as its plasma. This concentrated waste enables it to live in a dry or desert environment where little water is available for him to drink. Most of its water is metabolically produced from the oxidation of carbohydrates, fats and proteins in the seeds that it eats. The animals remain in a cool burrow during day time and the respiratory moisture condensed in nasal passages.

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93.

Which one of the flowing is the correct percentage of the two (out of the total of 4 ) green-house gases that contribute to the total global warming? 

  • CFC 14%, CH4 20%

  • CO2 40% CFCs 30%

  • N2O 6%, CO2 86%

  • N2O 6%, CO2 86%


A.

CFC 14%, CH4 20%

The gases, which are transparent to solar radiation but retain and partially reflect back long wave heat radiations are called greenhouse gases. Recently, the concentration of green -house effect that is resulting in increases the mean global temperature. It is called global warming. The various greenhouse gases are CO2 (warming effect 60%) CH4 (20%)<CFC (14%) and nitrous oxide - N2O (6%)

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94.

Ascaris is characterised by 

  • the absence of true coelom but the presence of metamerism

  • the presence of neither true coelom nor metamerism

  • the presence of true coelom but the absence of metamerism

  • the presence of true coelom but the absence of metamerism


B.

the presence of neither true coelom nor metamerism

Ascaris is an endoparasite of man. It inhabits the small intestine more frequently of children than of adults. the body is elongate, cylindrical and gradually tapering at both ends. There is no metameric segmentation. In Ascaris between the body wall and Visceral organs is a spacious fluid filled cavity. This cavity is not true coelom as it is not lined by coelomic epithelium, has no relation with reproductive and excretory organs and develops from blastocoel. This body cavity is referred pseudocoel.

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95.

Quercus species are the dominant component in 

  • temperature deciduous forests

  • alpine forests

  • scrub forests

  • scrub forests


A.

temperature deciduous forests

Temperate deciduous forests grow in continental climates with summer rainfall and severe winters. They are dominated by broad-leaved deciduous trees like Quercus Virginiana, magnolias, boys and allies as well as such tropical species as Ficus aurea, Lysiloma, Tropical rainforests occupy low altitude zones near the equator where annual rainfall exceeds 80" and 90" distributed over the year. Thress generally from three storeys scattered very tall emergent trees. Canopy layer and understorey stratum.
Tropical scrub forests develop in areas where moisture relations are intermediate between desert and savanna on one hand and rainforest on other.

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96.

Which one of the following is incorrect about the characteristics of protobionts  (coacervates and microspheres) as envisaged in the abiogenic origin of life? 

  • They were able to reproduce

  • They could separate combinations of molecules from the surroundings

  • They were partially isolated from the surroundings

  • They were partially isolated from the surroundings


D.

They were partially isolated from the surroundings

Homoeostasis is keeping the internal environment of the body constant. It is necessary for normal life processes. Microspheres are molecular aggregates of proteinoids. Oparin and Sydney Fox held that large organic molecules synthesized abiotically on primitive earth formed large colloidal aggregates due to the intermolecular attraction. These colloidal particles were called coacervates. Oparin called giant nucleoprotein poid molecules as protobionts. These reproduce either by budding a binary fission but do not exhibit homoeostasis.

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97.

World summit on sustainable development (2002) was held in 

  • Brazil

  • Sweden

  • Argentina

  • Argentina


D.

Argentina

In 1992 world leaders convened an Earth Summit in Rio de Janeiro,Brazil, in search of international agreements that could help save the world from pollution, poverty and the waste or resource.Another earth summit was convened from 26 August to 4 September a 2002 in Johannesburg, South Africa. Negotiators for 191 countries agreed on an  action plan to alleviate poverty and conserve the natural resource of earth.

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