The earthworm dies due to _______ if its skin turns dry.
Important Questions on Invertebrate Phyla
(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.
In the given diagram of the digestive system of earthworm, identify parts labelled as and select the correct option ?
Match the following features to the animals. Which is the correct combination?
Open circulatory system
Closed circulatory system
Earthworm
Malpighian tubules
Nephridia
Cockroach
A. Testes
B. Accessory glands
C. Spermathecae
D. Ovaries
Arrange them in a correct sequence from anterior end to posterior end.
(Parts of alimentary canal of earthworm) |
(Respective segments) |
||
|---|---|---|---|
| Buccal cavity | |||
| Pharynx | |||
| Oesophagus | |||
| Gizzard | |||
| Stomach | |||
| Intestine | to last | ||
| Typhlosole |
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?
