MCQ on Organisms and Populations Chapter 12 Class 13 Biology with Answers

MCQ on Organism and Population Class 12 is one of the best strategies to prepare for the CBSE Class 12 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more Class 12 Organism and Population MCQ, which will help them all through their board test.

MCQ on Organism and Population Class 12 with Answer PDF

Class 12 Biology MCQ with answers are given here to chapter 12 Organism and Population. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 12 Biology syllabus. By Solving these Class 12 Organisms and Populations MCQ, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 12 Annual exam.

Learn MCQ on Organism and Population Class 12 PDF with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 12 Organism and Population MCQ with answers given below.

Question 1. An association of individuals of different species living in the same habitat and having functional interactions is
(a) ecosystem
(b) population
(c) ecological niche
(d) biotic community.

Question 2. Pneumatophores occur in
(a) halophytes
(b) free-floating hydrophytes
(c) carnivorous plants
(d) submerged hydrophytes.

Question 3. Which one of the following is not a parasitic adaptation?
(a) Development of adhesive organs
(b) Loss of digestive organs
(c) Loss of reproductive capacity
(d) Loss of unnecessary sense organs

Question 4. Niche overlap indicates
(a) mutualism between two species
(b) active cooperation between two species
(c) two different parasites on the same host
(d) sharing of one or more resources between the two species.

Question 5. Reduction in vascular tissue, mechanical tissue and cuticle is characteristic of
(a) mesophytes
(b) epiphytes
(c) hydrophytes
(d) xerophytes.

Question 6. Large woody vines are more commonly found in
(a) temperate forests
(b) mangroves
(c) tropical rainforests
(d) alpine forests.

Question 7. Praying mantis is a good example of
(a) camouflage
(b) mullerian mimicry
(c) warning colouration
(d) social insects.

Question 8. Niche overlap indicates
(a) mutualism between two species
(b) active cooperation between two species
(c) two different parasites on the same host
(d) sharing of one or more resources between the two species.

Question 9. In which one of the following habitats does the diurnal temperature of soil surface vary most?
(a) Shrub land
(b) Forest
(c) Desert
(d) Grassland

Question 10. Animals have the innate ability to escape from predation. Examples for the same are given below. Select the incorrect example.
(a) Colour change in Chamaeleon
(b) Enlargement of body size by swallowing air in puffer fish
(c) Poison fangs in snakes
(d) Melanism in moths

Question 11. Plants such as Prosopis, Acacia and Capparis represent examples of tropical
(a) deciduous forests
(b) evergreen forests
(c) grasslands
(d) thorn forests.

Question 12. In Urn shaped age pyramid of the population the trend of growth is
(a) Rapid
(b) Stable
(c) Declining
(d) Stationary

Question 13. The sum total of the populations of the same kind of organisms constitute
(a) colony
(b) genus
(c) community
(d) species.

Question 14. Which of the following communities is more vulnerable to invasion by outside animals and plants?
(a) Temperate forests
(b) Oceanic island communities
(c) Mangroves
(d) Tropical evergreen forests

Question 15. A population of 500 that experiences 55 births and 5 deaths during a one-year period. What is the reproductive rate for the population during the one-year period ?
(a) 0.01/year
(b) 0.05/year
(c) 0.1/year
(d) 50/year

Question 16. Homeostasis is
(a) tendency of biological systems to change with change in environment
(b) tendency of biological systems to resist change
(c) disturbance of self regulatory system and natural controls
(d) biotic materials used in homeopathic medicines

Question 17. Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?
(a) Hydrilla
(b) Yucca
(c) Banana
(d) Viola

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Question 18. Carnivorous animals lions and leopards, occupy the same niche but lions predate mostly larger animals and leopards take smaller ones. This mechanism of competition is referred to as
(a) character displacement
(b) altruism
(c) resource partitioning
(d) competitive exclusion.

Question 19. Obligate parasites live on
(a) living host only
(b) living host and dead organic matter
(c) dead organic matter only
(d) artificial liquid medium

Question 20. Mycorrhizae are the example of
(a) amensalism
(b) antibiosis
(c) mutualism
(d) fungistasis.

Question 20. In which of the following interactions both partnersare adversely affected?
(a) Parasitism
(b) Mutualism
(c) Competition
(d) Predation

Question 21. When does the growth rate of a population following the logistic model equal zero? The logistic model is given as dN/dt = rN(1–N/K)
(a) when N/K equals zero
(b) when death rate is greater than birth rate
(c) when N/K is exactly one
(d) when N nears the carrying capacity of the habitat.

Question 22. The maintenance of internal favourable conditions, by a self regulated mechanisms inspite of the fact that there are changes in environment, is known as
(a) entropy
(b) enthalpy
(c) homoeostasis
(d) steady state

Question 23. Besides paddy fields, cyanobacteria are also found inside vegetative part of
(a) Equisetum
(b) Psilotum
(c) Pinus
(d) Cycas.

Question 24. Which one of the following is categorised as a parasite in true sense?
(a) The female Anopheles bites and sucks blood from humans.
(b) Human fetus developing inside the uterus draws nourishment from the mother.
(c) Head louse living on the human scalp as well as laying eggs on human hair.
(d) The cuckoo (koel) lays its eggs in crow’s nest.

Question 25. The age pyramid with broad base indicates
(a) high percentage of old individuals
(b) low percentage of young individuals
(c) a stable population
(d) high percentage of young individuals.

Question 26. Geometric representation of age structure is a characteristic of
(a) population
(b) landscape
(c) ecosystem
(d) biotic community.

Question 27. The rate of formation of new organic matter by rabbit in a grassland, is called
(a) Net productivity
(b) Secondary productivity
(c) Net primary productivity
(d) Gross primary productivity

Question 28. Which one of the following is a matching pair of certain organism(s) and the kind of association?
(a) Shark and sucker fish – Commensalism
(b) Algae and fungi in lichens – Mutualism
(c) Orchids growing on trees – Parasitism
(d) Cuscuta (dodder) growing on other -flowering plants – Epiphytism

Question 29. Certain characteristic demographic features of developing countries are
(a) high fertility, low or rapidly falling mortality rate, rapid population growth and a very young age distribution
(b) high fertility, high density, rapidly rising mortality rate and a very young age distribution
(c) high infant mortality, low fertility, uneven population growth and a very young age distribution
(d) high mortality, high density, uneven population growth and a very old age distribution.

Question 30. Which type of association is found in between entomophilous flower and pollinating agent?
(a) Mutualism
(b) Commensalism
(c) Co-operation
(d) Co-evolution

Question 31. Mycorrhiza is an example of
(a) symbiotic relationship
(b) ectoparasitism
(c) endoparasitism
(d) decomposers.

Question 32. Keystone species deserve protection because these
(a) are capable of surviving in harsh environmental conditions.
(b) indicate presence of certain minerals in thesoil.
(c) have become rare due to overexploitation.
(d) play an important role in supporting other species.

Question 33. In which of the following plant sunken stomata are found?
(a) Nerium
(b) Hydrilla
(c) Mango
(d) Guava

Question 34. Which one is true?
(a) Commensalism when none of the interacting populations affect each other.
(b) Symbiosis when the interaction is useful to both the populations.
(c) Symbiosis when neither populations affects each other.
(d) Commensalism when the interaction is useful to both the populations.

Question 35. Mycorrhiza exhibits the phenomenon of
(a) parasitism
(b) symbiosis
(c) antagonism
(d) endemism.

Question 36. Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called
(a) keystone species
(b) allopatric species
(c) sympatric species
(d) threatened species

Question 37. Competition for light, nutrients and space is most severe between
(a) closely related organism growing in different niche
(b) closely related organisms growing in the same area/niche
(c) distantly related organisms growing in the same habitat
(d) distantly related organisms growing in different niches.

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