Biology · Textbook solutions
Organisms and Populations
Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. Plus every board question asked from this chapter. · 18 questions
Exercise
18 q
Q1. Multiple choice questions
Practice · 5
- Multiple choice questions.Ex Q1(1)Which factor of an ecosystem includes plants, animals and microorganisms?
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- Ex Q1(2)An assembladge of individuals of different species living in the same habitat and having functional interactions is ................
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- Ex Q1(3)Association between sea anemone and clown fish is that of ................
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- Ex Q1(4)Select the statement which explains best parasitism.
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- Ex Q1(5)Growth of bacteria in a newlly innoculated agar plate shows ................
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Q2. Very short answer questions
Practice · 4
- Very short answer questions.Ex Q2(1)Define the following terms : a. Commensalism b. Parasitism c. Camouflage
- Ex Q2(2)Give one example for each : a. Mutualism b. Interspecific competition
- Ex Q2(3)Name the type of association: a. Clown fish and sea anemone b. Crow feeding the hatchling of Koel c. Humming birds and host flowering plants
- Ex Q2(4)What is the ecological process behind the biological control method of managing with pest insects?
Q3. Short answer questions
Practice · 7
- Short answer questions.Ex Q3(1)How is the dormancy of seeds different from hibernation in animals?
- Ex Q3(2)If a marine fish is placed in a fresh water aquarium, will it be able to survive? Give reason.
- Ex Q3(3)Name important defense mechanisms in plants against herbivores.
- Ex Q3(4)An orchid plant is growing on the branch of mango tree. How do you describe this interaction between the orchid and the mango tree?
- Ex Q3(5)Distinguish between the following: a. Hibernation and Aestivation b. Ectotherms and Endotherms c. Parasitism and Mutualism
- Ex Q3(6)Write a short note on : a. Adaptations of desert animals b. Adaptations of plants to water scarcity c. Behavioural adaptations in animals
- Ex Q3(7)Define Population and Community.
Q4. Long answer questions
Practice · 2
- Long answer questions.Ex Q4(1)With the help of suitable diagram describe the logistic population growth curve.
- Ex Q4(2)Enlist and explain the important characteristics of a population.
What the board has asked from this chapter
Questions per paper · 5 papers · 2024 to 2026
2024: 2.5 questions per paper. 2025: 2 questions per paper. 2026: 2 questions per paper
June 2026
2 q
- Q. 1(vi)A petridish containing nutrient medium shows tremendous increase in number of bacteria in short time. It is _____ growth.
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Population - Q. 18Describe commensalism giving two examples.Population Interactions
February 2026
2 q
- Q. 1(x)The number of deaths when environmental pressures come into play is known as _____.
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Population - Q. 17(a) Distinguish between hibernation and aestivation. (b) Give two behavioural adaptations of desert animals.Adaptation
July 2025
2 q
- Q. 1(vii)Identify the type of association between orchid growing as an epiphyte on branch of mango tree.
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Population Interactions - Q. 19Describe any three chemical defence mechanisms in plants against herbivores in population interaction.Population Interactions
July 2024
2 q
- Q. 2(vii)Mention the type of association between sea anemone and clown fish.Population Interactions
- Q. 21Explain the following terms with respect to survival of an organism in a changed environment. (a) Regulate (b) Conform (c) MigrateMajor Abiotic Factors
March 2024
3 q
- Q. 1(ix)Identify the appropriate term for the number of births under ideal conditions :
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Population - Q. 2(viii)Explain the term Emigration.Population
- Q. 10Describe mutualism.Population Interactions
The 10 board questions to practise first
The questions the board asked again come first, most asked first. Each one says how often and when.
Question 1
This type asked 2 times: Mar 2024, Jun 2026. This one: Jun 2026
Q. 18Describe commensalism giving two examples.Question 2
This type asked 2 times: Mar 2024, Feb 2026. This one: Feb 2026
Q. 1(x)The number of deaths when environmental pressures come into play is known as _____.Tap an option to check your answer.
Question 3
This type asked 2 times: Jul 2024, Jul 2025. This one: Jul 2025
Q. 1(vii)Identify the type of association between orchid growing as an epiphyte on branch of mango tree.Tap an option to check your answer.
Question 4
Asked once: Mar 2024 (same type asked 2 times)
Q. 10Describe mutualism.Question 5
Asked once: Mar 2024 (same type asked 2 times)
Q. 1(ix)Identify the appropriate term for the number of births under ideal conditions :Tap an option to check your answer.
Question 6
Asked once: Jul 2024 (same type asked 2 times)
Q. 2(vii)Mention the type of association between sea anemone and clown fish.Question 7
Asked once: Jun 2026
Q. 1(vi)A petridish containing nutrient medium shows tremendous increase in number of bacteria in short time. It is _____ growth.Tap an option to check your answer.
Question 8
Asked once: Feb 2026
Q. 17(a) Distinguish between hibernation and aestivation. (b) Give two behavioural adaptations of desert animals.Question 9
Asked once: Jul 2025
Q. 19Describe any three chemical defence mechanisms in plants against herbivores in population interaction.Question 10
Asked once: Jul 2024
Q. 21Explain the following terms with respect to survival of an organism in a changed environment. (a) Regulate (b) Conform (c) Migrate