Organisms and Populations Practice Test

12th Standard Zoology — Organisms and Populations: Online Practice Test

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All populations in a given physical area are defined as

A.Biome B.Ecosystem C.Territory D.Biotic factors

Organisms which can survive a wide range of temperature are called

A.Ectotherms B.Eurytherms C.Endotherms D.Stenotherms

The interaction in nature, where one gets benefit on the expense of other is...

A.Predation B.Mutualism C.Amensalism D.Commensalism

Predation and parasitism are which type of interactions?

A.(+,+) B.(+, O) C.(--, --) D.(+, --)

Competition between species leads to

A.Extinction B.Mutation C.Amensalism D.Symbiosis

Which of the following is an r-species

A.Human B.Insects C.Rhinoceros D.Whale

Match the following and choose the correct combination from the options given below. Column I A. Mutualism B. Commensalism C. Parasitism D. Competition E. Predation Column II 1. Lion and deer 2. Round worm and man 3. Birds compete with squirrels for nuts 4. Sea anemone on hermit crab 5. Barnacles attached to Whales

A.A- 4, B-5, C-2, D-3, E-1 B.A- 3, B-1, C-4, D-2, E-5 C.A- 2, B-3, C-1, D-5, E-4 D.A- 5, B-4, C-2, D-3, E-1

The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do A, B and C represent respectively.

சுற்றுச்சூழல் காரணிகளுக்கு ஏற்ப உயிரினங்களின் எதிர்வினையைக் காட்டும் வரைபடம்.

A.A- Conformer, B- Regulator, C- Partial Regulator B.A- Regulator, B- Partial Regulator, C- Conformer C.A- Partial Regulator, B- Regulator, C- Conformer D.A- Regulator, B- Conformer, C- Partial Regulator

The relationship between sucker fish and shark is...........

A.Competition B.Commensalism C.Predation D.Parasitism

Q10

Which of the following is correct for r-selected species

A.Large number of progeny with small size B.Large number of progeny with large size C.Small number of progeny with small size D.Small number of progeny with large size

Q11

Animals that can move from fresh water to sea called as.....

A.Stenothermal B.Eurythermal C.Catadromous D.Anadromous

Q12

Some organisms are able to maintain homeostasis by physical means ...

A.Conform B.Regulate C.Migrate D.Suspend

Q13

According to Van't Hoff's rule, what is the typical Q10 value for metabolic reactions in living systems?

A.1.0 B.2.0 C.3.0 D.4.0

Q14

Which eco-geographic principle states that populations or species of larger body size are found in colder regions, while smaller ones inhabit warmer areas?

A.Hardy-Weinberg law B.Van't Hoff's rule C.Bergman's rule D.Hardin's principle

Q15

Who was the first ecologist to use the term 'niche' to describe the functional status of an organism in its community?

A.Charles Elton B.Walter Rosen C.Edward Wilson D.Paul Ehrlich

Q16

Which of the following is an example of amensalism interaction where one species is harmed while the other remains unaffected?

A.Sucker fish attached to a shark B.Barnacles attached to a whale C.Small insects disturbed by grazing cattle D.Lower organisms destroyed under the feet of elephants

Q17

What is the short-term physiological adjustment made by an animal to overcome environmental stress, such as plains dwellers increasing their red blood cell count when moving to high altitudes?

A.Acclimatization B.Aestivation C.Diapause D.Homeostasis

Q18

In a pond ecosystem, which species functions as a column feeder within its ecological niche?

A.Catla B.Rohu C.Mrigal D.Sucker fish

Q19

Which of the following characteristics is typically associated with r-selected species?

A.Large body size B.Extended parental care C.Production of many small offspring D.Long life expectancy

Q20

Certain snails and fishes undergo a state of inactivity during summer to avoid heat and desiccation. This phenomenon is known as:

A.Hibernation B.Aestivation C.Diapause D.Acclimatization

Q21

What term is used to describe groups of species that perform comparable functional roles with similar niche dimensions within a single biotic community?

A.Guilds B.Ecological equivalents C.Conformers D.Biomes

Q22

Which of the following represents a facultative mutualistic relationship where the interacting species can also exist independently of each other?

A.Cellulose-digesting bacteria in the caeca of herbivores B.Cross-pollination of flowers by insects seeking nectar C.The association between a hermit crab and a sea anemone D.Lichens formed by fungi and algae

Q23

What is the scientific term used for the study of animal behavior under natural conditions?

A.Ecology B.Ethology C.Pedogenesis D.Anthropology

Q24

An organism whose body temperature and osmotic concentration change directly in accordance with the surrounding ambient environment is classified as a:

A.Regulator B.Conformer C.Eurytherm D.Stenotherm

Q25

According to the competitive exclusion principle of Hardin, what occurs when resources in a habitat are inadequate to meet the demands of competing species?

A.All competing species coexist equally by sharing B.The weaker or least adapted individuals are excluded C.Both species undergo rapid genetic mutation D.The organisms immediately migrate to different continents

Q26

Which of the following is classified as an ectoparasite that lives on the outer surface of its host?

A.Ascaris B.Tapeworm C.Head louse D.Plasmodium

Q27

Which type of population growth model displays a sigmoid curve and is limited by the carrying capacity of the environment?

A.J-shaped growth model B.S-shaped growth model C.Exponential growth model D.Geometric growth model

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About this Organisms and Populations test

This free online practice test covers Organisms and Populations from the 12th Standard Zoology (Samacheer Kalvi) syllabus. Choose the number of questions and an optional time limit, then answer and submit — everything is checked in your browser, with the correct answers and a worked explanation shown at the end. For the full solutions to every question in this set, see the solved MCQs page.

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