Class 8 Microorganisms Friend And Foe CBSE Questions & Answers

Class 8 · Microorganisms Friend And Foe

This is Science Class 8 Microorganisms Friend And Foe CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
A virus particle will never contain:
  • A
    protein
  • B
    DNA
  • C
    ER
    Correct
  • D
    RNA
2
Mosquito is not causal organism of malaria but it is :
  • A
    carrier of Plasmodium
    Correct
  • B
    vector of AIDS
  • C
    intermediate host of malarial parasite
  • D
    primary host of Plasmodium
3
For pasteurization, milk should be :
  • A
    first filtered then heated
  • B
    first chilled then heated
  • C
    packed and stored by sudden chilling
  • D
    first heated then chilled
    Correct
4
Viruses do not multiply inside?
  • A
    algae
  • B
    bacteria
  • C
    fungi
  • D
    non living cell
    Correct
5
The microorganism which is never useful is:
  • A
    fungi
  • B
    bacteria
  • C
    virus
    Correct
  • D
    protozoa
6
The property of body to fight with pathogens is called:
  • A
    vaccinity
  • B
    antipathogenicity
  • C
    medical treatment
  • D
    immunity
    Correct
7
Vaccines generally contain :
  • A
    mixture of several useful microbes
  • B
    a non pathogenic microbe
  • C
    antibiotic producing microorganisms
  • D
    weak or dead pathogen
    Correct
8
Microbes are successful due to their:
  • A
    various shapes
  • B
    all of these
  • C
    decomposing nature
  • D
    tolerance
    Correct
9
The group of microbe regarded as aquatic green plants is:
  • A
    both algae & fungi
  • B
    fungi
  • C
    Euglena
  • D
    algae
    Correct
10
Which of the following have a cell wall?
  • A
    bacteria
  • B
    all of these
    Correct
  • C
    plant
  • D
    fungi
11
Who will not be able to consume solid food?
  • A
    Rhizobium
    Correct
  • B
    Euglena
  • C
    Paramecium
  • D
    Amoeba
12
We study about microorganisms to:
  • A
    increase our knowledge about science
  • B
    create database for future generations
  • C
    develop strategies to kill them and make earth disease free
  • D
    be aware of their positive and negative effects
    Correct
13
A well defined nucleus is absent in :
  • A
    Chlorella
  • B
    Salmonella
    Correct
  • C
    Rhizopus
  • D
    Chlamydomonas
14
Viruses are unaffected by :
  • A
    antibodies
  • B
    none of these
  • C
    antibiotics
    Correct
  • D
    both antibiotics & antibodies
15
Microbes are unable to survive in solutions of _____ concentration.
  • A
    low
  • B
    both high and low
  • C
    high
    Correct
  • D
    equivalent