NCERT Solutions for Class 12 Physical+education Chapter 13 Organisms And Populations

Organisms And Populations Here is the CBSE Physical+education Chapter 13 for Class 12 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 12 Physical+education Organisms And Populations Chapter 13 NCERT Solutions for Class 12 Physical+education Organisms And Populations Chapter 13 The following is a summary in Hindi and English for the academic year 2025-26. You can save these solutions to your computer or use the Class 12 Physical+education.

Question 9

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Fill in the blanks with suitable words :

1. The optimal capacity of the organism to produce offspring is called........................

2. Rapid increase in human population is called........................

3. Mathematical expression of the growth of population is called........................

4. Yeast cells grown in a culture medium show........................growth curve.

5. Main cause of population explosion is........................

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NCERT Solutions for Class 12 Physical+education Chapter 13 Organisms And Populations

To live in groups is beneficial because :
feeling of security
can obtain food easily
Partner is available for mating
All the above

Ants give information to their companions :
by dancing
by secretion of pheromones
by making sound
by defecating

Population density is denoted by the symbol
N
D
M
D

The number of births during a given period in the
population that are added to the initial density is
:
Natality
Mortality
Migration
Immigration

The departure of a individual from a population is called :
Natality
Mortality
Immigration
Emigration

In which interaction only one species is benefitted while the other species is neither harmed nor benefitted ?
Parasitism
Predation
Both (A) and (B)
commenalism

Which of the following interaction both species suffer ?
Competition
Mutualism
Commensalism
Amensalism

In which of the following interaction both species are benefitted ?
Competition
Mutualism
Parasitism
Commensalism

State true or false :
A.
In Mutualism both species are benefited.
B.
Soil is the most important factor for growth of organisms .
C.
In parasitism both species are harmed.
D.
Desert plants have sunken stomata.
E.
Animals go into hibernation in summers.

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NCERT Solutions for Class 12 Physical+education Chapter 13 Organisms And Populations

To live in groups is beneficial because : feeling of security can obtain food easily Partner is available for mating All the above

Ants give information to their companions : by dancing by secretion of pheromones by making sound by defecating

Population density is denoted by the symbol NDMD

The number of births during a given period in thepopulation that are added to the initial density is : NatalityMortalityMigrationImmigration

The departure of a individual from a population is called : Natality Mortality Immigration Emigration

In which interaction only one species is benefitted while the other species is neither harmed nor benefitted ? ParasitismPredationBoth (A) and (B)commenalism

Which of the following interaction both species suffer ? CompetitionMutualismCommensalismAmensalism

In which of the following interaction both species are benefitted ? CompetitionMutualismParasitismCommensalism

State true or false : A.In Mutualism both species are benefited.B.Soil is the most important factor for growth of organisms .C.In parasitism both species are harmed.D.Desert plants have sunken stomata.E.Animals go into hibernation in summers.

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

To live in groups is beneficial because :
feeling of security
can obtain food easily
Partner is available for mating
All the above

Ants give information to their companions :
by dancing
by secretion of pheromones
by making sound
by defecating

Population density is denoted by the symbol
N
D
M
D

The number of births during a given period in the
population that are added to the initial density is
:
Natality
Mortality
Migration
Immigration

The departure of a individual from a population is called :
Natality
Mortality
Immigration
Emigration

In which interaction only one species is benefitted while the other species is neither harmed nor benefitted ?
Parasitism
Predation
Both (A) and (B)
commenalism

Which of the following interaction both species suffer ?
Competition
Mutualism
Commensalism
Amensalism

In which of the following interaction both species are benefitted ?
Competition
Mutualism
Parasitism
Commensalism

State true or false :
A.
In Mutualism both species are benefited.
B.
Soil is the most important factor for growth of organisms .
C.
In parasitism both species are harmed.
D.
Desert plants have sunken stomata.
E.
Animals go into hibernation in summers.