-
question_answer1)
Rigid outer part of earth consisting of crust and upper mantle is:
A)
Exosphere done
clear
B)
Lithosphere done
clear
C)
Hydrosphere done
clear
D)
Atmosphere done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer2)
Which one of the following statements is incorrect?
A)
Decomposers supply nutrients to the growing plants in the forest. done
clear
B)
Decomposers help in the accumulation of dead bodies of plants and animals in forests. done
clear
C)
Decomposers help in formation of manure. done
clear
D)
All the above done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer3)
Which of the following is a liquid waste?
A)
Sludge done
clear
B)
Sewage done
clear
C)
Rags done
clear
D)
All the above done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer4)
In waste water treatment useful products obtained are:
A)
Biogas done
clear
B)
Sludge done
clear
C)
Aerobic bacteria done
clear
D)
Both [a] and [b] done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer5)
Decomposers are also known as :
A)
Autotrophs done
clear
B)
Herbivores done
clear
C)
Saprotrophs done
clear
D)
Canopy done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer6)
Starting from the top to bottom which one of the following sequence of layers of forest is correct?
A)
Understorey, Shrub layer, Forest floor, Herb layer, Canopy done
clear
B)
Canopy, Understorey, Shrub layer, Herb layer, Forest floor done
clear
C)
Canopy, Understorey, Herb layer, Shrub layer. Forest floor done
clear
D)
Shrub layer, Herb layer, Forest floor, Understorey, Canopy done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer7)
Which of the following helps in maintaining the supply of nutrients to the plants?
A)
Frog done
clear
B)
Grasshopper done
clear
C)
Fungi done
clear
D)
Mosquito done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer8)
A ____ has a very strong stem.
A)
Bush done
clear
B)
Tree done
clear
C)
Creeper done
clear
D)
Climber done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer9)
Branchy part of a tree above the stem is known as:
A)
Shrub done
clear
B)
Herb done
clear
C)
Crown done
clear
D)
Floor done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer10)
Herbs form the ____ layer of vegetation in the forest.
A)
Lowest done
clear
B)
Highest done
clear
C)
Middle done
clear
D)
All the above done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer11)
A major component of soil, dark brown in colour and consists of decaying remains of plants and animals.
A)
Mineral particles done
clear
B)
Silt done
clear
C)
Humus done
clear
D)
Sand done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer12)
Which of the following is not responsible for destruction of forests?
A)
Deforestation done
clear
B)
Afforestation done
clear
C)
Fire done
clear
D)
Overgrazing done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer13)
The forests which are commonly known as orchard of the world?.
A)
Temperate deciduous forests. done
clear
B)
Temperate evergreen forests. done
clear
C)
Mediterranean forests. done
clear
D)
All the above done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer14)
Which of the following is not a process of cleaning water?
A)
Filtration done
clear
B)
Decantation done
clear
C)
Infiltration done
clear
D)
Chlorination done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer15)
Which of the following functions is not performed by earthworms in the soil?
A)
Loosening the soil. done
clear
B)
Improving the soil quality. done
clear
C)
Irrigating the soil. done
clear
D)
Enriching the soil by nutrients. done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer16)
World water day is celeberated on:
A)
22 June done
clear
B)
22 March done
clear
C)
22 Dec done
clear
D)
5 June done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer17)
Which one of the following is an organic impurity present in sewage?
A)
Nitrates done
clear
B)
Metals done
clear
C)
Urea done
clear
D)
Phosphates done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer18)
Provision of drainage at a place by laying sewers under the ground is:
A)
Sewage done
clear
B)
Contaminants done
clear
C)
Sewerage done
clear
D)
Decomposition done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer19)
Which of the following characteristics belongs to the B-Horizon?
(i) It is also known as sub-soil. |
(ii) It has very little humus. |
(iii) It consists of bed rocks. |
(iv) It is rich in soluble minerals. |
A)
(i) and (ii) done
clear
B)
(i), (ii) and (iv) done
clear
C)
(ii), (iii) and (iv) done
clear
D)
(i), (iii) and (iv) done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer20)
Portable toilets are ____ toilets.
A)
Septic tank done
clear
B)
Composting done
clear
C)
Chemical done
clear
D)
Vermi-processing done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer21)
Highest layer of vegetation in a forest:
A)
Understorey done
clear
B)
Canopy done
clear
C)
Herb layer done
clear
D)
Shrub layer done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer22)
Which of the following is prepared from the wood obtained from forest?
A)
Paper done
clear
B)
Matchsticks done
clear
C)
Plywood done
clear
D)
All the above done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer23)
Which of the following is not required for the weathering of rocks?
A)
Wind done
clear
B)
Sun's heat done
clear
C)
Ploughing done
clear
D)
Rain done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer24)
In digester tank which one of the following is present?
A)
Aerobic bacteria done
clear
B)
Anaerobic bacteria done
clear
C)
Red worms done
clear
D)
Both [a] and [b] done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer25)
Soil containing smallest rock particles is:
A)
Silt done
clear
B)
Sand done
clear
C)
Gravel done
clear
D)
Clay done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer26)
Match the following:
Column A | Column B |
(i) | A- horizon | [A] | Subsoil |
(ii) | B- horizon | [B] | Hard rock |
(iii) | C- horizon | [C] | Substratum |
(iv) | D- horizon | [D] | Rich humus |
A)
(i-D), (ii-B), (iii-A), (iv-C) done
clear
B)
(i-D), (ii-A), (iii-C), (iv-B) done
clear
C)
(i-D), (ii-B), (iii-C), (iv-A) done
clear
D)
(i-B), (ii-D), (iii-A), (iv-C) done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer27)
It is difficult to dig deeper into the soil because:
A)
Plants are there. done
clear
B)
Microorganisms are present there. done
clear
C)
Partially weathered rocks or bed rock are present there. done
clear
D)
All the above done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer28)
Which of the following statements is correct?
(i) Loamy soil contains sufficient amount of humus. |
(ii) Clayey soil contains good quantity of sand and silt. |
(iii) Sandy soil cannot hold much water in it. |
(iv) Size of Clay particles is bigger than those of silt particles. |
A)
(i) and (ii) done
clear
B)
(i) and (iii) done
clear
C)
(ii) and (iii) done
clear
D)
(iii) and (iv) done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer29)
Plants mainly absorb water and minerals from:
A)
R - horizon done
clear
B)
A - horizon done
clear
C)
B - horizon done
clear
D)
C - horizon done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer30)
Unweathered solid rocks are present in:
A)
B - horizon done
clear
B)
A - horizon done
clear
C)
R - horizon done
clear
D)
C - horizon done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer31)
Reyansh wants to prepare some toys and statues by using soil. Which type of soil he should use for this purpose?
A)
Sandy soil done
clear
B)
Siltysoil done
clear
C)
Gravel soil done
clear
D)
Clayey soil done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer32)
Minimum percolation of water is seen in:
A)
Loamy soil done
clear
B)
Clayey soil done
clear
C)
Sandy soil done
clear
D)
Silt soil done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer33)
___ is the uppermost fertile layer of earth crust.
A)
Mineral done
clear
B)
Metal done
clear
C)
Bed rock done
clear
D)
Topsoil done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer34)
Highest water holding capacity is of:
A)
Sandy soil done
clear
B)
Loamy soil done
clear
C)
Clayey soil done
clear
D)
Gravel soil done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer35)
Which of the following contains largest sized rock particles?
A)
Silt done
clear
B)
Gravel done
clear
C)
Clay done
clear
D)
Sand done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer36)
The soil which is obtained from basaltic rock is:
A)
Desert soil done
clear
B)
Red soil done
clear
C)
Alluvial soil done
clear
D)
Black soil done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer37)
Which soil is also known as ?Khadar??
A)
Red soil done
clear
B)
Black soil done
clear
C)
Alluvial soil done
clear
D)
Desert soil done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer38)
Which of the following is mostly used for road construction?
A)
Clay done
clear
B)
Gravel done
clear
C)
Silt done
clear
D)
Loam done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer39)
Choose the correct order for the particle sizes of different types of soil.
A)
Sand > gravel > silt > clay done
clear
B)
Clay > gravel > sand > silt done
clear
C)
Gravel > clay > sand > silt done
clear
D)
Gravel > sand > silt > clay done
clear
E)
None of these done
clear
View Solution play_arrow
-
question_answer40)
Name the term used for accumulation of wastes in the soil generated by human activity that alter the features of soil.
A)
Percolation done
clear
B)
Soil erosion done
clear
C)
Soil pollution done
clear
D)
Soil precaution done
clear
E)
None of these done
clear
View Solution play_arrow