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Medical
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In a growing population of a country

  • Option 1)

    reproductive and pre -reproductive individuals are equal in number.

  • Option 2)

    reproductive individuals are less than the post - reproductive individuals.

  • Option 3)

    pre - reproductive individuals are more than the reproductive individuals.

  • Option 4)

    pre - reproductive individuals are less than the reproductive individuals .

 

As we learnt in

Population Growth -

The size of a population for any species is not a static parameter. It keeps changing in time, depending on various factors including food availability, predation pressure and adverse weather.

- wherein

It is these changes in population density that give us some idea of what is happening to the population – whether it is flourishing or declining.

 

Whenever the pre-reproductive individuals or the younger population size is larger than the reproductive group, the population will be an increasing population.

 


Option 1)

reproductive and pre -reproductive individuals are equal in number.

This is incorrect.

Option 2)

reproductive individuals are less than the post - reproductive individuals.

This is incorrect.

Option 3)

pre - reproductive individuals are more than the reproductive individuals.

This is correct.

Option 4)

pre - reproductive individuals are less than the reproductive individuals .

This is incorrect.

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Medical
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Match the items given in Column I with those in Column II and select the correct option given below : 

 

Column I   Column II
a. Eutrophication i. UV - B radiation

b.

Sanitary landfill ii. Deforestation
c. Snow blindness iii. Nutrient enrichment
d. Jhum cultivation iv. Waste disposal

 

  • Option 1)
    a b c d
    iii iv i ii

     

  • Option 2)
    a b c d
    i iii iv ii
  • Option 3)
    a b c d
    ii i iii iv
  • Option 4)
    a b c d
    i ii iv iii
 

As we learnt in  

Causes of water pollution -

Eutrophication

- wherein

Rich growth of micro-organisms consumes most of the dissolved oxygen, so as to deprive other organisms. It generally occurs at the bottom layers of deep lakes. Addition of excessive plant nutrients intensifies eutrophication. It is harmful to fish and other aquatic life.

 

Jhum cultivation -

Trees are axed for timber, firewood, cattle ranching and for several other purposes.

- wherein

Slash and burn agriculture, commonly called as Jhum cultivation in the north-eastern states of India, has also contributed to deforestation.

 

Sanitary landfills -

Sanitary landfills were adopted as the substitute for open-burning dumps

.

- wherein

In a sanitary landfill, wastes are dumped in a depression or trench after compaction, and covered with dirt everyday.

 

Effect of UV light -

UV radiation of wavelengths shorter than UV-B, are almost completely absorbed by Earth’s atmosphere, given that the ozone layer is intact. But, UV-B damages DNA and mutation may occur

- wherein

It causes aging of skin, damage to skin cells and various types of skin cancers. In human eye,cornea absorbs UV-B radiation, and a high dose of UV-B causes inflammation of cornea, called snow-blindness, cataract, etc. Such exposure may permanently damage the cornea.

 

Eutrophication- Nutrient enrichment

Sanitary landfill - Waste disposal

Snow blindness - UV-B radiation

Jhum cultivation - Deforestation

 


Option 1)

a b c d
iii iv i ii

 

This is correct.

Option 2)

a b c d
i iii iv ii

This is incorrect.

Option 3)

a b c d
ii i iii iv

This is incorrect.

Option 4)

a b c d
i ii iv iii

This is incorrect.

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Medical
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All of the following are included in 'Ex - situ conservation ' except

  • Option 1)

    Botanical gardens

  • Option 2)

    Sacred groves

  • Option 3)

    Wildlife safari parks

  • Option 4)

    Seed banks

 

As we learnt in

In situ conservation -

In-situ conservation is the on-site conservation or the conservation of genetic resources in natural populations of plant or animal species, such as forest genetic resources in natural populations of tree species.

- wherein

It is the process of protecting an endangered plant or animal species in its natural habitat, either by protecting or restoring the habitat itself, or by defending the species from predators. 

 

Sacred groves – in-situ conservation.

In-situ conservation is the on-site conservation or the conservation of genetic resources in natural populations of plant or animal species.


Option 1)

Botanical gardens

This is incorrect.

Option 2)

Sacred groves

This is correct.

Option 3)

Wildlife safari parks

This is incorrect.

Option 4)

Seed banks

This is incorrect.

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Medical
281 Views   |  

In stratosphere , which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen ?

  • Option 1)

    Fe

  • Option 2)

    Cl

  • Option 3)

    Carbon

  • Option 4)

    Oxygen

 

As we learnt in 

Degradation of ozone layers -

There should be a balance between production and degradation of ozone in the stratosphere. Of late, the balance has been disrupted due to enhancement of ozone degradation by chlorofluorocarbons (CFCs).

- wherein

CFCs find wide use as refrigerants. CFCs discharged in the lower part of atmosphere move upward and reach stratosphere. In stratosphere, UV rays act on them releasing Cl atoms. Cl degrades ozone releasing molecular oxygen, with these atoms acting merely as catalysts; Cl atoms are not consumed in the reaction. Hence, whatever CFCs are added to the stratosphere, they have permanent and continuing affects on Ozone levels.

 

 

UV rays act on CFCs, releasing Cl atoms, chlorine reacts with converting into oxygen.

 


Option 1)

Fe

This is incorrect.

Option 2)

Cl

This is correct.

Option 3)

Carbon

This is incorrect.

Option 4)

Oxygen

This is incorrect.

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Medical
364 Views   |  

What type of ecological pyramid would be obtained with the following data ?

Secondary consumer : 120 g

Primary consumer : 60 g

Primary producer : 10 g

  • Option 1)

    Upright pyramid of numbers

  • Option 2)

    Pyramid of energy

  • Option 3)

    Inverted pyramid of biomass

  • Option 4)

    Upright pyramid of biomass

 

3

Medical
97 Views   |  

Niche is

  • Option 1)

    the range of temperature that the organism needs to live

  • Option 2)

    the physical space where an organism lives

  • Option 3)

    all the biological factors in the organism ' s environment

  • Option 4)

    the functional role played by the organism where it lives

 

As we learnt in

Importance of Species diversity to the Ecosystem -

Biodiversity is important because it helps in preventing the extinction of species. It allows the organisms to adapt according to the environment and provide wider range of material and food for survival. It is the biodiversity that provides vast genetic pools that helps in preserving existence of life on earth.

- wherein

Biodiversity helps in maintaining equilibrium in the environment and also defines the manner in which different organisms interact with each other. It helps in maintaining the balance by recycling and storage of nutrients, stabilizing climate, forming and protecting soil, combating pollution and thereby maintaining eco-balance. It is threatened by climatic change, overexploitation of natural resources, habitat loss and pollution. Loss of biodiversity weakens the connection between various species in the ecosystem.      
 

 

 Ecological niche was termed by J. Grinnel. It refers the functional role played by the organism where it lives.


Option 1)

the range of temperature that the organism needs to live

This is incorrect.

Option 2)

the physical space where an organism lives

This is incorrect.

Option 3)

all the biological factors in the organism ' s environment

This is incorrect.

Option 4)

the functional role played by the organism where it lives

This is correct.

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Medical
116 Views   |  

Which of the following is a secondary pollutant ?

  • Option 1)

    SO2

  • Option 2)

    CO2

  • Option 3)

    CO

  • Option 4)

    O3

 

As we learnt in 

Secondary air pollutants -

Secondary air pollutants are poisonous substance formed from primary air pollutants. In bright sun light nitrogen, nitrogen oxides, hydrocarbons and O2 interact to produce more powerful photochemical oxidants like ozone (O3), peroxyacetyl nitrate (PAN), aldehydes, sulphuric acid, peroxides, etc.

- wherein

All these constitute photochemical smog, which retard photosynthesis in plants.

O3 (ozone) is a secondary pollutant. These are formed by the reaction of primary pollutant.

 


Option 1)

SO2

This is incorrect.

Option 2)

CO2

This is incorrect.

Option 3)

CO

This is incorrect.

Option 4)

O3

This is correct.

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Medical
144 Views   |  

World ozone day is celebrated on

  • Option 1)

    16th September

  • Option 2)

    21st April

  • Option 3)

    5th June

  • Option 4)

    22nd April

 

As we learnt in

The Earth Summit -

The historic Convention on Biological Diversity (‘The Earth Summit’) held in Rio de Janeiro in 1992, called upon all nations to take appropriate measures for conservation of biodiversity and sustainable utilisation of its benefits.

- wherein

In a follow-up, the World Summit on Sustainable Development held in 2002 in Johannesburg, South Africa, 190 countries pledged their commitment to achieve by 2010, a significant reduction in the current rate of biodiversity loss at global, regional and local levels.
 

 

 

 

World Ozone day is celebrated on 16th September.

5th June - World Environment Day

21st April - National Yellow Bat Day

22nd April - National Earth Day


Option 1)

16th September

This is correct.

Option 2)

21st April

This is incorrect.

Option 3)

5th June

This is incorrect.

Option 4)

22nd April

This is incorrect.

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Medical
134 Views   |  

Natality refers to

  • Option 1)

    Number of individuals leaving the habitat

  • Option 2)

    Birth rate

  • Option 3)

    Death rate

  • Option 4)

    Number of individuals entering a habitat

 

As we learnt in 

Natality -

Refers to the number of births during a given period in the population that are added to the initial density.

-

Natality refers to birth rate.

• Death rate – Mortality

• Immigration -Number of individual entering a habitat is

• Emigration - Number of individual leaving the habitat

 


Option 1)

Number of individuals leaving the habitat

This is incorrect.

Option 2)

Birth rate

This is correct.

Option 3)

Death rate

This is incorrect.

Option 4)

Number of individuals entering a habitat

This is incorrect.

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Medical
551 Views   |  

Which one of the following plants shows a very close relationship with a species of moth , where none of the two can complete its life cycle without the other ?

  • Option 1)

    Banana

  • Option 2)

    Yucca

  • Option 3)

    Hydrilla

  • Option 4)

    Viola

 

 2 Yucca 

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