CBSE Biology Ecology and Environment Test 3 Online

Test Name	Ecology and Environment Test
Subject	CBSE Biology
Test Type	MCQs
Total Question	30
Total Marks	60
Total Time	25 Minutes
Test Help For	CBSE Biology. CBSE Board Exams. Entrance Exams. Admissions Test. Jobs Test. General Knowledge. All Grades Exams.

Ecology and Environment test paper preparation for CBSE Board Biology examinations according to the latest syllabus prescribed for current session. Our topic is Ecology includes the study of interactions that organisms have with each other, other organisms, and with abiotic components of their environment. It is an interdisciplinary field that includes biology, geography, and Earth science. Ecologists study the interactions between organisms and their environment, and how these interactions affect where, and in what numbers, different types of organisms knowledge. CBSE official take this subject examinations from their affiliated boards.

Following test take online for more preparation and boost your level.

CBSE Biology Ecology and Environment Test 3 Online

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1. The greatest biomass of autotrophs in the world's oceans is that of?

benthic brown algae, coastal red algae and daphnids

free floating micro-algae cyanobacteria and nano plankton

benthic diatoms and marine viruses

sea grasses and slime mokls

Question 1 of 30

2. In which one of the following pair is the specific characteristic of soil not correctly matched?

Terra rossa __ Most suitable for roses

Literate __ Contains aluminum compound

Chernozems __ Richest soil in the world

Black soil __ Rich in calcium carbonate

Question 2 of 30

3. Choose the correct match

Bladder worth, sundew, venus fly trap?

Nepenthes, Dionea, Drosera

Dionea, Trapa, Vanda

Utricularia, Drosera, Dionea

Nepenthes, Utricularia, Vanda

Question 3 of 30

4. Mycorrhiza is an example of?

ectoparasitism

decomposers

endoparasitism

symbiotic relationship

Question 4 of 30

5. Special kinds of roots called pneumatophores are characteristics of the plants growing in?

marshy places and salt lakes

sandy soils

dry land regions

saline soils

Question 5 of 30

6. Diffuse porous woods are characteristic of plants growing in?

temperate climate

tropics

cold winter regions

alpine region

Question 6 of 30

7. If by radiation all nitrogenous enzymes are inactivated then there will be no?

conversion from ammonium to nitrate in soil

fixation of nitrogen in legumes

fixation of atmospheric nitrogen

conversion from nitrate to nitrite in legumes

Question 7 of 30

8. In which condition the gene ratio remains constant for any species?

Mutation

Random mating

Gene flow

Sexual selection

Question 8 of 30

9. An ecosystem which can be easily damaged but can recover after some time if damaging effect stops will be having?

high stability and low resilience

low stability and high resilience

low stability and low resilience

high stability and high resilience

Question 9 of 30

10. Species are considered as?

the lowest units of classification

real basic units of classification

real units of classification devised by taxonomists

artificial concept of human mind which cannot be defined in absolute terms

Question 10 of 30

11. In which one of the following habitats does the diurnal temperature of soil surface vary most?

Grassland

Shrubland

Forest

Desert

Question 11 of 30

12. Which of the following is a correct pair?

Dischidia __ Insectivorous

Opuntia __ Predator

Capsella __ Hydrophyte

Cuscuta __ Parasite

Question 12 of 30

13. In 1984 the Bhopal gas tragedy took place because methyl isocyanate?

reacted with ammonia

reacted with CO

reacted with DDT

reacted with water

Question 13 of 30

14. Which of the following is absent in polluted water?

Larva of stone fly

Hydrilla

Blue green algae

Water hyacinth

Question 14 of 30

15. Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example?

color change in Chameleon

melanism in moths

poison fangs in snakes

enlargement of body size by swallowing air in puffer fish

Question 15 of 30

16. Recently Govt. of India has allowed mixing of alcohol in petrol. What is the amount of alcohol permitted for mixing in petrol?

10-15%

10%

2.5%

Question 16 of 30

17. More than 70% of world's fresh water is contained in?

Antarctica

glaciers and mountains

Greenland

polar ice

Question 17 of 30

18. Escherichia coli is used as an indicator organism to determine pollution of water with?

heavy metals

industrial effluents

fecal matter

pollen of aquatic plants

Question 18 of 30

19. There is no life on moon due to absence of?

Live in same niche

Live in different habitats

Interbreeding

Live in same habitat

Question 19 of 30

20. Which of the following is not true for a species?

Each species is reproductively isolated from every other species

Gene flow does not occur between the populations of a species

Variations occur among members of a species

Members of a species can interbreed

Question 20 of 30

21. Which of the following is expected to have the highest value (gm/m² /yr) in a grassland ecosystem?

Net Production (NP)

Secondary Production (SP)

Tertiary Production (TP)

Gross Production (GP)

Question 21 of 30

22. Which type of association is found in between entomophilous flower and pollinating agent?

Cooperation

Commensalism

Co-evolution

Mutualism

Question 22 of 30

23. Relative Biological Effectiveness (RBE) usually refers to the damages caused by?

high temperature

low temperature

radiation

pollution

Question 23 of 30

24. Which of the following is not used for disinfection of drinking water?

chlorine

chloramine

ozone

Phenyl

Question 24 of 30

25. Which one of the following pair is mismatched?

Fossil fuel burning __ Release of CO 2

Solar energy __ Green-house effect

Biomass burning __ Release of CO 2

Nuclear power __ Radioactive wastes

Question 25 of 30

26. What is the intensity of sound in normal conversation?

120-150 dB

70-90 dB

10-20 dB

30-60 dB

Question 26 of 30

27. What is BOD?

The amount of O 2 utilized by micro-organisms for decomposition

All of the above

The total amount of O 2 present in water

The amount of O 2 utilized organisms in water

Question 27 of 30

28. Two different species cannot live for long duration in the same niche or habitat. This law is?

Gauss's competitive exclusion principal

Mendel's law

Allene's law

Weismann's theory

Question 28 of 30

29. Fluoride pollution mainly affects?

teeth

heart

kidney

brain

Question 29 of 30

30. Prolonged liberal irrigation of agricultural fields is likely to create the problem of?

salinity

aridity

metal toxicity

acidity

Question 30 of 30

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2021-01-17

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CBSE Biology Ecology and Environment Test 3 Online

CBSE Biology Ecology and Environment Test 3 Online

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