MCQ
Diphtheria is caused by
- ✓Bacteria
- BVirus
- CNematodes
- DNone of these
(a) Diphtheria is a serious disease caused by bacterium Corynebacterium diphtheriae. It commonly attacks mucous membrane of nose, throat and tonsils. The symptoms include high fever, sore throat, difficulty in breathing due to chocking.
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$I$. Removal of $80\; \%$ tigers from an area resulted in greatly increased growth of vegetation.
$II.$ Removal of most of the carnivores resulted in an increased population of deers.
$III.$ The length of food chains is generally limited to $3$ to $4$ trophic levels due to energy loss.
$IV.$ The length of food chains may vary from $2$ to $8$ trophic levels.
Which two of the above statements are correct?