Ncert Exercises & Solutions

Match the following.

Column I

Column II

A. Hermaphrodite

B. Direct development

C. Chemoreceptor

D. Blood gland in earthworm

1. Produces blood cells and haemoglobin

2. Testis and ovary in the same animal

3. Larval form absent

4. Sense of chemical substances

Codes

Options:	A	B	C	D
1.	2	3	4	1
2.	3	2	4	1
3.	1	3	2	4
4.	2	4	3	1

(a) Hermaphrodites bear testis and ovary within the same organism, (e.g., earthworm Pheretima).

Direct development occurs in Organisms in which there is no larval stage in third life-cycle and therefore no metamorphosis takes place, (e.g., Pheretima and Lumbricus).

Chemoreceptors or chemosensors are the sensory receptors used in sensin chemical substances, (e.g., olfactory receptor and taste buds in mammals).

Blood gland in earthworm are specialised glands that are associated with the generation of blood cells and haemoglobin in Pheretima.

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