Organisms and Populations
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Organisms and Environment
SubtopicOrganisms and Environment under Organisms and Populations for Grade 12 CBSE.
Preview questions (no answers)
- 1.
Based on the diagram of organismal response strategies, identify the category that includes 'Aestivation' and 'Hibernation'.
A.Regulate
B.Conform
C.Migrate
D.Suspend
- 2.
The process by which an organism maintains a constant internal environment despite varying external environmental conditions is called:
A.Homeostasis
B.Conformity
C.Migration
D.Suspension
- 3.
Organisms that are restricted to a narrow range of salinity are referred to as:
A.Euryhaline
B.Stenohaline
C.Eurythermal
D.Stenothermal
Download the worksheet for Organisms and Populations - Organisms and Environment to practice offline. It includes additional chapter-level practice questions.
Populations: Growth, Attributes and Age Pyramids
SubtopicPopulations: Growth, Attributes and Age Pyramids under Organisms and Populations for Grade 12 CBSE.
Preview questions (no answers)
- 1.
The maximum number of individuals of a population that a given environment can support sustainably is known as its:
A.Biotic potential
B.Environmental resistance
C.Carrying capacity
D.Intrinsic rate of natural increase
- 2.
In the equation for population density , what does 'I' represent?
A.Index of growth
B.Immigration
C.Intrinsic rate of increase
D.Inflow of resources
- 3.
A population age pyramid with a very broad base indicates that the population is:
A.Stable
B.Declining
C.Expanding
D.At carrying capacity
Download the worksheet for Organisms and Populations - Populations: Growth, Attributes and Age Pyramids to practice offline. It includes additional chapter-level practice questions.
Population Interactions (Mutualism, Competition, Predation, Parasitism)
SubtopicPopulation Interactions (Mutualism, Competition, Predation, Parasitism) under Organisms and Populations for Grade 12 CBSE.
Preview questions (no answers)
- 1.
Which of the following interactions is correctly paired with its effect on the two participating species ()?
A.Predation: ()
B.Mutualism: ()
C.Parasitism: ()
D.Competition: ()
- 2.
Lichens represent a well-known example of mutualism. They are a symbiotic association between which two organisms?
A.Bacteria and Fungi
B.Algae and Fungi
C.Fungi and roots of higher plants
D.Algae and Virus
- 3.
In a biological interaction represented by the signs (), one species is benefited while the other is harmed. If the benefited species is physically smaller and lives on or inside the larger host to derive nutrition, the interaction is called:
A.Commensalism
B.Parasitism
C.Mutualism
D.Competition
Download the worksheet for Organisms and Populations - Population Interactions (Mutualism, Competition, Predation, Parasitism) to practice offline. It includes additional chapter-level practice questions.