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[A] : Problems of ecological environmen...

[A] : Problems of ecological environment arise from over population.
[R] : Over population results in depletion of natural resources more quickly and cause pollution also .

A

(a) If both A and R are true and R is the correct explanation of A

B

(b) If both A and R are true but R is not the correct explanation of A

C

(c) If A is true and R is false

D

(d) If both A and R are false

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Assertion and reason type questions (for AIIMS aspirants) Assertion: Overpopulation has become a serious problem in the developing countries. Reason: It may exhaust natural resources, cause unemployment and lead to pollution.

Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Eutrophication causes reduction in

Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Which one of the air pollutant is most toxic?

Pollutants are the substances which present in the environment in greater proportion than its natural abundance and resulting in harmful or deterimental effect on the quality of environment. Generally highly toxic substances are considered . Generally highly toxic even substances that are normally considered harmless can cause pollution if they are present in underirable concentration. Over exploitation of natural resourses uncontrolled mechanisation deforestation and extensive use of chemical fertilizers and pesticides have brought about many changes in different component of the environment . Acid rain is due to the increase in the concentration of . . . . . . . in the atmospheres

[A] : The food webs are very important in maintaining the stability of an ecosystem in nature . [R] : The decrease in the population of rabbit would naturally cause an increase in the population of alternative herbivores e.g. , mouse .

Industrial melanism in peppered moth occurred due to natural selection . The significant reason for this is (a) the light coloured white moths could not be noticed by predatory birds after deposition of soots on bark of trees (b) mutation in light coloured moths due to increase in industrial pollution (c) advantageous selection of black moths on tree in polluted areas, resulting in increase population of black moths (d) advantageous selection of white moths on tree in polluted areas, resulting in increased population of white moths

The main cause of extinction of species from tropical area is : (a) Over - exploitation (b) Deforestation (c) Alien species invasion (d) More than one option is correct

A botanist is cultivating a rare species of plant in a controlled environment and currently has 3000 of these plants. The population of this species that the botanist expects to grow next year, N_("next year") , can be estimated from the number of plants this year, N_("this year") , by the equation below. N_("next year")=N_("this year")+0.2(N_("this year"))(1-(N_("this year"))/(K)) The constant K in this formula is the number of plants the environment is able to support. The botanist would like to increase the number of plants that the environment can support so that the population of the species will increase more rapidly. If the botanist’s goal is that the number of plants will increase from 3000 this year to 3360 next year, how many plants must the modified environment support?

TRUEMEN BIOLOGY ENGLISH-Ecology -ASSERTION AND REASON
  1. Assertion (A) : Tropical rain forests are disappearing fast from devel...

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  2. [A] : Leaf butterfly & stick insect show mimicry to dodge their enemi...

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  3. [A] : In a food chain , membrane of successive higher levels are fewer...

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  4. Assertion (A) : Methane component of greenhouse gases contributing to ...

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  5. Assertion: Suspended particulate matter(SPM) is an important pollutant...

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  6. Assertion : Age sex structure of human population in countries like Fr...

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  7. Assertion (A) : Presently, the global atmosphere is warming up. Reas...

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  8. [A] : Ozone depletion at the south pole will threats world's fisheries...

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  9. [A] : Inquilines can not survive without human care . [R] : Cultige...

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  10. [A] : Problems of ecological environment arise from over population....

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  11. [A] : Social forestry programme is grows trees for fuel , fodder & fru...

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  12. [A] : Cultigens (domesticated animals & cultivated plants ) are not in...

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  13. [A] : Population density of indicator organisms show degree of water p...

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  14. [A] : Traffic Jams cause giddiness , reduced vision , exhaustion etc ....

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  15. [A] : Thermal pollution is harmful to fishes . [R] : Heating cause...

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  16. [A] : Stratosphere is an excellent region for air travel . [R] : Be...

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  17. [A] : Using dung as fuel greatly reduces grain production . [R] : Du...

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  18. Assertion : Lichens are a pioneer community in the temperate region. ...

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  19. Assertion: Global water cycle does not involve the living organisms. ...

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  20. [A] : Life occurs upto 15000 m in the air on mountains . [R] : At gr...

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