MEDIUM
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Given is the figure of the alimentary canal of the earthworm. Select the option that correctly identifies the parts labelled as A to E .

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  A B C D E
(i) Pharynx Stomach Caecum Gizzard Lymph gland
(ii) Gizzard Pharynx Stomach Caecum Lymph gland
(iii) Pharynx Gizzard Stomach Caecum Lymph gland
(iv) Gizzard Pharynx Liver Stomach Villi

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Important Questions on Structural Organisation in Animals

MEDIUM

In the given diagram of the digestive system of earthworm, identify parts labelled as1, 2 ,3, 4 & 5 and select the correct option ?

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MEDIUM
The spermatheca, which receive and store spermatozoa in pheretima are present in
MEDIUM
Following are the statements about prostomium of earthworm.
(a) It serves as a covering for the mouth.
(b) It helps to open cracks in the soil into which it can crawl.
(c) It is one of the sensory structures.
(d) It is the first body segment.
EASY
The following are the various parts of reproductive system of Pheretima.
A. Testes
B. Accessory glands
C. Spermathecae
D. Ovaries
Arrange them in a correct sequence from anterior end to posterior end.
EASY

Match the following features to the animals. Which is the correct combination?

1. Open circulatory system

2. Closed circulatory system

3. Earthworm

4. Malpighian tubules

5. Nephridia

6. Cockroach

MEDIUM
The figure showing the nephridial system of earthworm is given here. Identify the types of nephridia labeled as A, B, and C from the list (i) to (iii) given below and select the correct option.
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(i) Septal nephridia
(ii) Integumentary nephridia
(iii) Tufts of pharyngeal nephridia
MEDIUM

Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

MEDIUM
Earthworms have no skeleton but during burrowing, the anterior end becomes turgid and acts as a hydraulic skeleton. It is due to
HARD

Consider the following statements:

(i) The body wall of an earthworm is covered externally by a thin, non-cellular cuticle, below which lies epidermis.

(ii) The epidermis of an earthworm is made up of a single layer of columnar epithelial cells which contain secretory gland cells.

(iii) The setae are present in all segments of the body of earthworm.

(iv) Septal nephridia are present in first 14 segments in Pheretima.

Which of the above statements are correct?

EASY
A median mid-dorsal line along the longitudinal axis of the body of earthworm is represented by: