question_answer 22)

  Match the following.                                           

Column I	Column II
A.  Hermaphrodite	1.Produces blood cells and hemoglobin
B.  Direct development	2. Testis and ovary in the same animal
C.  Chemoreceptor	3.  Larval form absent
D.  Blood gland in earthworm	4.  Sense of chemical substances

Codes ABC  DABCD (a) 2   3   4   1                     (b)3   2   4   1 (c) 1   3   2   4                     (d) 2   4   3   1

Answer:

  (a) Hermaphrodites bear testis and ovary within the same organism, (e.g., earthworm or  Pheretima). Direct development occurs in organisms in which there is no larval stage in the life-cycle   and therefore no metamorphosis takes place, (e.g., Pheretima and Lumbricus). Chemoreceptors orchemosensors are the sensory receptors used in sensingchemical substances, (e.g., olfactory receptor and taste buds in mammals). Blood gland in earthworm are specialized glands that are associated with the generation of blood cells and hemoglobin in Pheretima.