Organisms and Populations

Bihar Board Class 12 · Biology · 31 past questions

1. Q1 2026 Set A

   Which of the following processes decreases population density?

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2. Q2 2026 Set A

   Which of the following was used to control the cactus that had been introduced in Australia?

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3. Q3 2026 Set A

   What is lichen an example of?

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4. Q4 2025

   Which of the following was used to control opuntia in Australia?

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5. Q5 2025

   Which of the following is not a role predation?

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6. Q6 2025

   What is the process called in which of the fitness of one species decreases in the presence of another…

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7. Q7 2025

   The interaction between population of clown fish and sea anemone is an example of which of the following?

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8. Q8 2024 Set E

   Name of Ramdeo Mishra is associated with which field of research?

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9. Q9 2024 Set E

   Which of the following statements is incorrect about temperature?

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10. Q10 2024 Set E

    When percentage of individuals of pre-reproductive, reproductive and post-reproductive phase is in decreasing…

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11. Q11 2024 Set E

    Which of the following reproduces once in a lifetime?

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12. Q12 2024 Set E

    What was the reason for co-existence of five closely related species of warblers?

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13. Q13 2024 Set E

    Which of the following plants produces poisonous cardiac glycoside?

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14. Q14 2023

    Which one is not a hydrophytic plant ?

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15. Q15 2023

    Sunken stomata is found in –

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16. Q16 2023

    Plants growing on rocks are called as –

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17. Q17 2023

    Reduction in vascular tissue, mechanical tissue and cuticle is characteristic feature of whom ?

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18. Q18 2023

    Which plant is found in mangrove zone ?

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19. Q19 2023

    The feature of the xerophytic plant leaves are –

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20. Q20 2022 Set A

    It is an example of desert adaptation.

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21. Q21 2022 Set A

    Mycorrhiza is a symbiotic association

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22. Q22 2022 Set A

    Mutualism occurs

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23. Q23 2021 Set H

    Which one is hydrophytic plant?

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24. Q24 2019

    Number of deaths during a limited time period an place for a particular population is known as

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25. Q25 2019

    What are adaptation? Explain with examples.

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26. Q26 2019

    Differentiate between commensalism and Amensalism

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27. Q27 2017

    Which one is hydrophytic plant?

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28. Q28 2017

    Write the ecological adaptations among xerophytic plants.

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29. Q29 2017

    Define the following…

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30. Q30 2015

    What are the forms of total population? Write in brief.

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31. Q31 2015

    Write about hydrophytes, xerophytes and mesophytes with suitable examples.

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