Question: From NCERT 100% NCERT covered from Particular Keyword. NEET 2013 Explanations are 100% from NCERT | [Difficult level: Easy]
Infection of Ascaris usually occurs by
(1) drinking water containing egg of Ascaris
(2) eating imperfectly cooked pork
(3) tse-tse fly
(4) mosquito bite
Answer:(1) drinking water containing egg of Ascaris
👉Ascaris, the common round worm and Wuchereria,
the filarial worm, are some of the helminths which are
known to be pathogenic to man. Ascaris, an intestinal
parasite causes ascariasis. Symptoms of these disease
include internal bleeding, muscular pain, fever, anemia
and blockage of the intestinal passage. The eggs of the
parasite are excreted along with the faeces of infected
persons which contaminate soil, water, plants, etc. A
healthy person acquires this infection through
contaminated water, vegetables, fruits, etc.
the filarial worm, are some of the helminths which are
known to be pathogenic to man. Ascaris, an intestinal
parasite causes ascariasis. Symptoms of these disease
include internal bleeding, muscular pain, fever, anemia
and blockage of the intestinal passage. The eggs of the
parasite are excreted along with the faeces of infected
persons which contaminate soil, water, plants, etc. A
healthy person acquires this infection through
contaminated water, vegetables, fruits, etc.
👉Phylum – Aschelminthes
The body of the aschelminthes is circular in
cross-section, hence, the name roundworms
(Figure 4.10). They may be freeliving, aquatic
and terrestrial or parasitic in plants and animals.
Roundworms have organ-system level of body
organisation. They are bilaterally symmetrical,
triploblastic and pseudocoelomate animals.
Alimentary canal is complete with a welldeveloped
muscular pharynx. An excretory
tube removes body wastes from the body cavity
through the excretory pore. Sexes are separate
(dioecious), i.e., males and females are distinct.
Often females are longer than males. Fertilisation
is internal and development may be direct (the
young ones resemble the adult) or indirect.
Examples : Ascaris (Roundworm), Wuchereria
(Filaria worm), Ancylostoma (Hookworm).
