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
TMV will grow :
  • A
    in the space between tobacco cells
  • B
    in the soil surrounding tobacco roots
  • C
    inside the tobacco cells
    Correct
  • D
    outside the tobacco cells
2
Bacteriophages are:
  • A
    bacteria infecting viruses
  • B
    protozoa infecting bacteria
  • C
    fungi infecting bacteria
  • D
    viruses infecting bacteria
    Correct
3
Which disease still doesn
  • A
    tuberculosis
  • B
    malaria
    Correct
  • C
    jaundice
  • D
    cholera
4
Microbial diseases are :
  • A
    non-communicable
  • B
    communicable
    Correct
  • C
    all curable by antibiotic treatment
  • D
    without any antibiotic treatment
5
Air tight packing of fruits and other materials :
  • A
    preserves carbon dioxide of container
  • B
    prevents dehydration
  • C
    keeps food free of oxygen
  • D
    prevents microbial attack
    Correct
6
The autotrophic filamentous microbes living in water or moist soil are :
  • A
    algae
    Correct
  • B
    bacteria
  • C
    fungi
  • D
    protozoa
7
The microbe used as single cell protein:
  • A
    Chlorella
    Correct
  • B
    Rhizobium
  • C
    Yeast
  • D
    Penicillium
8
Edible fungi are:
  • A
    mushroom
    Correct
  • B
    both mushroom & mildew
  • C
    smut fungi
  • D
    mildew
9
A microorganism is spherical in shape, it can be :
  • A
    Rhizopus
  • B
    both bacterium & virus
    Correct
  • C
    a virus
  • D
    a bacterium
10
A microbe makes bakery products fluffy and spongy, it is :
  • A
    yeast
    Correct
  • B
    bread mould
  • C
    lactobacilli
  • D
    Penicillium
11
Suppose all soil bacteria are removed what will be the result?
  • A
    all grasses will appear more green
  • B
    all plants growing in that soil will become disease free
  • C
    soil fertility will increase
  • D
    soil fertility will decrease
    Correct
12
Soham observed some microbes under microscope. He saw a microbe irregular in shape and locomoting with false feet, it is:
  • A
    Euglena
  • B
    Amoeba
    Correct
  • C
    Paramecium
  • D
    Hydra
13
A slipper shaped fresh water protozoan moves with the help of:
  • A
    pseudopodia
  • B
    flagella
  • C
    tentacles
  • D
    cilia
    Correct
14
Which is not caused by protozoans?
  • A
    malaria
  • B
    amoebic dysentry
  • C
    food poisoning
    Correct
  • D
    pyorrhoea
15
Match the following :i) Penicillin………………….a) pathogenii) blue green algae………..b) antibioticiii) virus……………………..c) malariaiv) Plasmodium……………d) lack chlorophyllv) fungi……………………..e) fertiliser
  • A
    i.c,ii.e,iii.d, iv.a, v.b
  • B
    i.b,ii.d,iii.e, iv.c, v.a
  • C
    i.b,ii.e,iii.a, iv.c, v.d
    Correct
  • D
    i.d,ii.a,iii.b, iv.e, v.c