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?
Important Questions on Animal Diversity- I (Invertebrate Phyla)
In the given diagram of the digestive system of earthworm, identify parts labelled as and select the correct option ?
(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.
A. Testes
B. Accessory glands
C. Spermathecae
D. Ovaries
Arrange them in a correct sequence from anterior end to posterior end.
Match the following features to the animals. Which is the correct combination?
Open circulatory system
Closed circulatory system
Earthworm
Malpighian tubules
Nephridia
Cockroach
(i) Septal nephridia
(ii) Integumentary nephridia
(iii) Tufts of pharyngeal nephridia
(i) Earthworm is mainly ureotelic.
(ii) Septal nephridia, present on both sides of intersegmental septa of segment 15 to the last, open into the intestine.
(iii) Integumentary nephridia, attached to the lining of the body wall of segment 3 to the last, open on the body surface.
(iv) Different types of nephridia are basically similar in structure.
(v) Nephridia regulate the volume and composition of body fluids.
Identify the correct labelling of the diagram given below.
