Organism and Population MCQs Type Questions with Answer for ISC Class 12 Biology

Organism and Population MCQs Type Questions with Answer for ISC Class 12 Biology. These MCQs / Objective Type Questions is based on latest reduced syllabus according 2021-22 session on bifurcated pattern. Main motto of MCQ Type Question is cracking the next upcoming Sem-2 exam of council. Visit official website CISCE for detail information about ISC Class-12 Biology.

 ISC Class 12 Organism and Population MCQs Type Questions with Answer

Board	ISC
Class	12th (XII)
Subject	Biology
Chapter	Organism and Population
Syllabus	on bifurcated syllabus (after reduction)
Session	2021-22
Bifurcated	Sem-2
Topic	MCQs / Objective Type Question

ISC Organism and Population MCQs Questions with Answers for Class-12 Biology

Question 1: For human population, the age pyramids generally show age distribution of

(a) Only males
(b) Only females
(c) Of males and females
(d) None of the above

Answer : (c) Of males and females

Question 2: Niche overlap is:

(a) Mutualism between two species
(b) Active cooperation between two species
(c) Tjvo different parasites on same food
(d) Sharing resources between two species

Answer : (d) Sharing resources between two species

Question 3: Animals undergo inactive stage during winters. It is called :

(a) Acclimatisation
(b) Hibernation
(c) Aestivation
(d) Adapatation

Answer : (b) Hibernation

Question 4: Praying mantis is a good example of:

(a) Camouflage
(b) Mullarian mimicry
(c) Warning colouration
(d) Social insect

Answer : (a) Camouflage

Question 5: Which of the following would necessarily decrease the density of a population in a given habitat? 

(a) Natality > mortality
(b) Immigration > emigration
(c) Mortality and emigration
(d) Natality and immigration

Answer : (c) Mortality and emigration

Question 6: What parameters are used for tiger census in our country’s national parks and sanctuaries? [NCERT Exemplar]

(a) Pug marks only
(b) Pug marks and faecal pellets
(c) Faecal pellets only
(d) Actual head counts

Answer : (b) Pug marks and faecal pellets

Question 7: The shifting of an organism temporarily from the stressful habitat to a more hospitable area and return when stressful period is over is called

(a) Suspend
(b) Migrate
(c) Hibernation
(d) Aestivation

Answer : (b) Migrate

Question 8: Ozone protects biosphere from high energetic:

(a) Infra-red rays
(b) Ultraviolet rays
(c) X-rays
(d) gamma rays

Answer : (b) Ultraviolet rays

Question 9: Winter sleep is also called as

(a) Hibernation
(b) Suspend
(c) Migrate
(d) Aestivation

Answer : (a) Hibernation

Question 10:  Mycorrhiza is an example to:

(a) Decomposers
(b) Endoparasitism
(c) Symbiotic relationship
(d) Ectoparasitism

Answer : (c) Symbiotic relationship

Question 11:  Autecology is the

(a) Relation of an individual to its environment

(b) Relation of a community to its environment

(c) Relation of a biome to its environment

(d) Relation of a population to its environment

Answer : (a) Relation of an individual to its environment

Question 12:  To get pollinated by a bee, the Mediterranean Orchid, Ophrys, employs:

(a) Sexual deceit
(b) Pseudo-copulation
(c) Reward in the form of Nectar
(d) Place for laying eggs

Answer : (a) Sexual deceit

Question 13: It natality is balanced by mortality in a population at a given time, there will be a/an

(a) decrease in the population size
(b) increase in the population size
(c) zero population growth
(d) population explosion

Answer : (c) zero population growth

Question 14:  What are the key elements that lead to so much variations in the physical and chemical conditions of different habitats?

(a) Temperature and water
(b) Light and soil
(c) Only temperature
(d) Temperature, water, light and soil

Answer : (d) Temperature, water, light and soil

Question 15:  A majority of organisms which are restricted to narrow range of temperature are called as

(a) stenothermal
(b) endothermal
(c) ectothermal
(d) eurythermal

Answer : (a) stenothermal

Question 16: Mycorrhiza is an example of

(a) ectoparasitism
(b) mutualism
(c) endoparasitism
(d) predation

Answer : (b) mutualism

Question 17: Organisms that are restricted to a narrow range of salinity, are called

(a) ectohaline
(b) osmoconformer
(c) euryhaline
(d) stenohaline

Answer : (d) stenohaline

Question 18:  Salt concentration (Salinity) of the sea measured in parts per thousand is

(a) 30 – 35
(b) 0 – 5
(c) 30 – 70
(d) 10 – 15

Answer : (a) 30 – 35

Question 19: A group of populations of two or more species occupying the same geographical area during a particular time is called

(a) Community
(b) Interaction
(c) Commensalism
(d) None of these

Answer : (a) Community

Question 20:  An organism that lives in or on another organism and derives nutrients for itself at the expense of the host organism is called

(a) Parasite
(b) Predator
(c) Both
(d) None of these

Answer : (a) Parasite

Question 21: What parameters are used for tiger census in our country’s national parks and sanctuaries?

(a) Pug marks and faecal pellets
(b) Actual head counts
(c) Faecal pellets only
(d) Pug marks only

Answer : (a) Pug marks and faecal pellets

Question 22: The rate of individuals born per 1,000 individuals per year is called

(a) Mortality rate
(b) Growth rate
(c) Vital rate
(d) Natality rate

Answer : (d) Natality rate

Question 23:  In which of the following interactions both partners are adversely affected ?

(a) Predation
(b) Parasitism
(c) Mutualism
(d) Competition

Answer : (d) Competition

Question 24: The process in which the body’s internal environment is kept stable is known as

(a) homeostasis
(b) adaptation
(c) geometry
(d) acclimatization

Answer : (a) homeostasis

Question 25: Just as a person moving from Delhi to Shimla to escape the heat for the duration of hot summer, thousands of migratory birds from Siberia and other extremely cold northern regions move to:

(a) Western Ghat
(b) Meghalaya
(c) Corbett National Park
(d) Keoladeo National Park

Answer : (d) Keoladeo National Park

Question 26:  Percolation and water holding capacity of soil is dependent upon

(a) soil composition
(b) grain size
(c) aggregation
(d) all of these

Answer : (d) all of these

Question 27:  The most ecologically relevant environmental factor is:

(a) Temperature
(b) Water
(c) Light
(d) Soil

Answer : (a) Temperature

Question 28: The term ‘precipitation’ includes

(a) rain
(b) snow
(c) hails
(d) all forms of water that fall to the ground.

Answer : (d) all forms of water that fall to the ground.

Question 29:  A stage of suspended development is called

(a) Diapause
(b) Suspend
(c) Migrate
(d) Aestivation

Answer : (a) Diapause

Question 30: What are the key elements that lead to so much variations in the physical and chemical conditions of different habitats?

(a) Temperature and water
(b) Light and soil
(c) Only temperature
(d) Temperature, water, light and soil

Answer : (d) Temperature, water, light and soil

Question 31:  Ecotone is

(a) A zone of transition between two communities
(b) A zone of developing community
(c) The bottom of a lake
(d) A polluted area

Answer : (a) A zone of transition between two communities

Question 32:  Habitat together with functions of a species constitute its:

(a) Topography
(b) Trophic level
(c) Boundary
(d) Ecological niche

Answer : (d) Ecological niche

Question 33: A majority of organisms which are restricted to narrow range of temperature are called as

(a) stenothermal
(b) endothermal
(c) ectothermal
(d) eurythermal

Answer : (a) stenothermal

Question 34:  Which plants is found in mangroove zone?

(a) Rhizophora
(b) Acacia
(c) Pinus
(d) Tectona grandis

Answer : (a) Rhizophora

Question 35:  A few organisms can tolerate and thrive a wide range of temperature. Such animals are called

(a) stenothermal
(b) eurythermal
(c) thermophilic
(d) ectothermal

Answer : (b) eurythermal

Question 36:  The process in which the body’s internal environment is kept stable is known as

(a) homeostasis
(b) adaptation
(c) geometry
(d) acclimatization

Answer : (a) homeostasis

Question 37: The salinity in sea water in parts per thousand (ppt) ranges between

(a) 5-15%
(b) 30-35%
(c) 50-75%
(d) more than 100%

Answer : (b) 30-35%

Question 38: Organisms that are restricted to a narrow range of salinity, are called

(a) ectohaline
(b) osmoconformer
(c) euryhaline
(d) stenohaline

Answer : (d) stenohaline

Question 39: Deep (>500m) in the oceans, the environment is perpetually dark and its inhabitants are not aware of the existence of a celestial source of energy called_________.

(a) ATP
(b) photosynthesis
(c) sun
(d) light

Answer : (c) sun

Question 40: The maximum growth rate occurs in :

(a) Lag phase
(b) Exponential, phase
(c) Stationary phase
(d) Senescent phase

Answer : (b) Exponential, phase

Question 41: The benthic organisms

(a) live near the sea bottom.
(b) found in open water.
(c) always live at the depth of 50-100 m.
(d) live outside water.

Answer : (a) live near the sea bottom.

Question 42: The term ‘precipitation’ includes

(a) rain
(b) snow
(c) hails
(d) all forms of water that fall to the ground

Answer : (d) all forms of water that fall to the ground