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Rajasthan Board Class 12 (RBSE) Microbes in Human Welfare — practice questions

Explore 23 free Microbes in Human Welfare questions in Rajasthan Board Class 12 (RBSE) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Microbes in Human Welfare questions and exercises with answers

Showing questions 1–23 of 23.

Anabaena and Nostoc are examples of:Read the answer and worked solution →Sort limbs by shared ancestryRead the answer and worked solution →Complete the chain from chemistry to lifeRead the answer and worked solution →True or false: variation and fitnessRead the answer and worked solution →Which process is this?Read the answer and worked solution →Darwin and selectionRead the answer and worked solution →True or false: how new species appearRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Tap every factor the chapter says can lead to new speciesRead the answer and worked solution →Order the sequence the chapter sets outRead the answer and worked solution →Reading the mechanisms backRead the answer and worked solution →True or false: evidence for evolutionRead the answer and worked solution →Chance or selection?Read the answer and worked solution →OriginsRead the answer and worked solution →Flip and pair: process with driverRead the answer and worked solution →Spot the odd one outRead the answer and worked solution →Assertion and reason: mechanismsRead the answer and worked solution →Two true, one falseRead the answer and worked solution →Tap every statement the chapter supportsRead the answer and worked solution →Complete the role of variationRead the answer and worked solution →

Worked practice questions

Anabaena and Nostoc are examples of:

  1. Bacteria-only nitrogen fixers
  2. Free-living protozoa decomposers
  3. Cyanobacterial biofertilisers
  4. Fungal mycorrhizal partners
Show answer and solution

Correct answer: C. Cyanobacterial biofertilisers

Anabaena, Nostoc are CYANOBACTERIA (blue-green algae) that fix atmospheric nitrogen in paddy fields. They photosynthesise and enrich soil with bioavailable nitrogen.

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Sort limbs by shared ancestry

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Left
Homologous
Items
  1. Item
    Bat forelimb
    Answer
    Homologous
  2. Item
    Human forelimb
    Answer
    Homologous
  3. Item
    Insect wing
    Answer
    Analogous
  4. Item
    Different origins
    Answer
    Analogous
  5. Item
    Same origin
    Answer
    Homologous
  6. Item
    Convergent result
    Answer
    Analogous
Right
Analogous
Instructions
Swipe left for homologous organs of one origin, right for analogous ones of different origins.
_Source: Qallery verified question bank, Class 12 State Board, topic Evolution_

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Complete the chain from chemistry to life

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Missing parts
  1. Answer
    chemical
    Choices
    1. chemical
    2. cultural
    3. physical
  2. Answer
    cellular
    Choices
    1. cellular
    2. vertebrate
    3. aquatic
Complete the statement
Most scientists believe {0} evolution, the formation of biomolecules, preceded the appearance of the first {1} forms of life.
Chemical evolution came first, on the current view. Source: syllabus Biology, Evolution.

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More Biology topics

Reproduction In OrganismsEvolutionBiotechnology ApplicationsReproductive HealthHuman Health and DiseaseMolecular Basis of InheritancePrinciples of Inheritance and VariationPrinciples Of Inheritance