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STD 12 - 7. human health and disease — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 7. human health and disease4 Marks
MCQ
The active form of Entamoeba histolytica feeds upon
  • A
    food in intestine
  • B
    blood only
  • ✓
    erythrocytes, mucosa and submucosa of colon
  • D
    mucosa and submucosa of colon only.
✓

Answer

Correct option: C.
erythrocytes, mucosa and submucosa of colon
c
(c) : Entamoeba histolytica (Gr., entos : within + amoeba : change + histos : tissue + lysis : dissolve) is the causative organism of amoebic dysentery or amoebiasis in man. It is a microscopic endoparasite of man. It is commonly found in the upper part of the large intestine (colon) and is very often lodged in the liver, lungs, brain and testes. In its life cycle, it occurs in three distinct forms $(i)$ trophozoite or magna form, $(ii)$ precystic or minuta form, and $(iii)$ cystic form. Trophozoite is the most active, motile and feeding form which is pathogenic to man. It lives in the mucous and submucous layers of the colon and feeds on these layers and erythrocytes.

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