Which of the following statement(s) provide true description of the given animal?
I. Cockroach - has 10 pairs of spiracles.
II. Earthworm- the alimentary canal consists of a sequence of pharynx, oesophagus, stomach, gizzard and intestine.
III. Frog- body is divisible into three regions- head, neck and trunk.

I only

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II only

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I and II

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I, II and III

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Solution

The correct option is A I only
There are 10 pairs of spiracles in a cockroach. Two pairs are present in the thoracic segments and the remaining eight pairs are present in the abdominal segments. These help in the exchanges of gases.

The alimentary canal of an earthworm consists of pharynx (4th segment), oesophagus (5th-7th segments), gizzard (8th-9th segments), stomach (9th-14th segments) and intestine (from 15th segment till the end). The stomach comes after the gizzard.

A frog's body is divided into head and trunk. Neck and tail are absent.

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Similar questions

Which of the following is the correct sequence of parts as they occur in the human alimentary canal ?

(a) Mouth $\to$ Stomach $\to$ Small intestine $\to$ Oesophagus $\to$ Large intestine
(b) Mouth $\to$ Oesophagus $\to$ Stomach $\to$ Large intestine $\to$ Small intestine
(c) Mouth $\to$ Stomach $\to$ Oesophagus $\to$ Small intestine $\to$ Large intestine
(d) Mouth $\to$ Oesophagus $\to$ Stomach $\to$ Small intestine $\to$ Large intestine

Question 77
Draw the diagram of the alimentary canal of man and label the following parts.
Mouth, Oesophagus, Stomach, Intestine

Question 4
Which is the correct sequence of parts in a human alimentary canal?

(a) $M o u t h \to s t o m a c h \to s m a l l i n t e s t i n e \to o e s o p h a g u s \to l a r g e i n t e s t i n e$
(b) $M o u t h \to o e s o p h a g u s \to s t o m a c h \to l a r g e i n t e s t i n e \to s m a l l i n t e s t i n e$
(c) $M o u t h \to s t o m a c h \to o e s o p h a g u s \to s m a l l i n t e s t i n e \to l a r g e i n t e s t i n e$
(d) $M o u t h \to o e s o p h a g u s \to s t o m a c h \to s m a l l i n t e s t i n e \to l a r g e i n t e s t i n e$

Q. Main parts of alimentary canal are the mouth, _________, Oesophagus, stomach, small intestine, large intestine, rectum and anus.

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Structural Organisation in Animals

Standard XII Biology

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