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Which of the following is put into Anaerobic digester for further sewage treatment?
Option: 1 Primary sludge
Option: 2 Floating debris
Option: 3 Effluents of primary treatment
Option: 4 Activated sludge  

 Activated sludge is a type of wastewater system as aerated sewage containing aerobic microorganisms which help to break it down. 

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Posted by

Ritika Jonwal

Which of the following is not an attribute of a population?
Option: 1 Sex ratio
Option: 2 natality
Option: 3 mortality
Option: 4 species interaction  

Species interaction

 

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Posted by

Anjali G. rathod

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Flippers of Penguins and Dolphins are examples of:
Option: 1 Adaptive radiation
Option: 2 Convergent evolution
Option: 3 Industrial melain
Option: 4 Natural selection  

Flippers of penguin and dolphins have different structures but similar functions and thus are categorized under analogous organs. Also, Penguin and dolphins are not closely related to each other but have evolved the similar traits ( as per this question - flippers) therefore, show convergent type of evolution. 

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Posted by

Ritika Jonwal

Match the trophic levels with their correct species examples in the grassland ecosystem.

(a) Fourth trophic level           (i) Crow

(b) Second trophic level         (ii) Vulture

(c) First trophic level              (iii) Rabbit

(d) Third trophic level             (iv) Grass
 

Option: 1 (a)         (b)        (c)         (d)
                (ii)         (iii)       (iv)          (i)
 Option: 2 (a)         (b)        (c)         (d)
                (iii)         (ii)        (i)          (iv)
Option: 3 (a)         (b)        (c)         (d)
                (iv)         (iii)        (ii)         (i)  
Option: 4 (a)         (b)        (c)         (d)
                (i)         (ii)       (iii)         (iv)

First trophic level is grass and only option 1 shows it.

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Posted by

Ritika Jonwal

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Which of the following regions of the globe exhibits highest species diversity?
Option: 1 Western Ghats of India
Option: 2 Madagascar
Option: 3 Himalayas
Option: 4  Amazon Forests    

Amazon forests have the highest diversity on the earth. Hence, the correct option is (d).

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Posted by

Ritika Jonwal

According to Robert May, the global species diversity is about :
Option: 1 1.5 million
Option: 2 20 million
Option: 3 50 million
Option: 4  7 million  

The global species diversity is about 7 million according to Robert May. Hence, the correct option is (d).

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Posted by

Ritika Jonwal

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Snow- blindnese in Antarctic region
Option: 1 Freezing of fluids in the temperature
Option: 2  Inflammation of cornea due  UV-B radiation
Option: 3 High reflection of light from
Option: 4 Damage to retina caused by infra  

 Snow- blindnese is caused because of direct exposure of UV-B radiations in the Antarctic region as it causes inflammation in the cornea.

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Posted by

Ritika Jonwal

The process of growth is maximum during  
Option: 1 Log phase
 
Option: 2 Lag Phase
 
Option: 3 Senescence
 
Option: 4 Dormancy

The growth rate becomes more rapid in the log phase. Hence, the correct option is (a). 

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Posted by

Ritika Jonwal

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Pinus seed cannot germinate and establish without fungal associaton. This is because:

  • Option 1)

    its embryo is immature

  • Option 2)

    it has obligate association with mycorrhizae

  • Option 3)

    it has a very hard seed coat

  • Option 4)

    its seed contain inhibitors that prevents germinatiom.

     

Pinus plant is devoid of root hair. So it has difficulty in absorbing water from the soil. A seed can only germinate after absorbing adequate amount of water. Hence, by the symbiotic association with fungi, pinus seed can germinate and grow. So the answer is option 2

 

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Posted by

Khushi pandya

Which of these following methods is the most suitable for disposal of nuclear waste ?

  • Option 1)

    Shoot the waste into space.

  • Option 2)

    Bury the waste under Antarctic ice-cover

  • Option 3)

    Dump the waste within rocks under deep ocean

  • Option 4)

    Bury the waste within rocks deep below the Earth's surface

 

Radioactive pollution -

This pollution occurs through radiations. Radiations are of two types:

- wherein

(i) Non ionising radiations: UV rays, IR rays, etc. UV rays cause skin burning, IR rays increases atmospheric temperature and leads to the green house effect.

(ii) Ionising radiation: X – rays, x-rays, beta-rays, gamma-rays cause genetic injury on mutation.

 

 

 

Nuclear or radioactive waste is recommended to be sufficiently pre-treated and disposed in suitably shielded buried within the rocks, about 500 m deep below the earth's surface.


Option 1)

Shoot the waste into space.

Option 2)

Bury the waste under Antarctic ice-cover

Option 3)

Dump the waste within rocks under deep ocean

Option 4)

Bury the waste within rocks deep below the Earth's surface

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Posted by

solutionqc

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