Answer the following
(i) What is the function of nephridia?
(ii) How many types of nephridia are found in earthworm based on their location ?

What are nephridia? Mention the types of nephridia in earthworm?

Answer in one word or one line. (i) Give the common name of Periplaneta americana. (ii) How many spermathecae are found in earthworm? (iii) What is the position of ovaries in the cockroach? (iv) How many segments are present in the abdomen of cockroach? (v) Where do you find malphigian tubules?

What is the function of the following : (i) Renal artery, (ii) Renal Vein.

Answer the following: (i) How many dimensions a solid has? (ii) How many books are there in Euclid's Elements? (iii) Write the numbers of faces of a cube and cuboid? (iv) What is sum of interior angles of a triangle? (v) Write three un-defined terms of geometry?

Answer any FOUR of the following questions. b. What is peptide linkages? How many peptide bonds are present in a tetra-peptide?·

The following table gives the life times of 400 neon lamps : (ii) How many lamps have a life time of more than 700 hours ?

How many types of restriction endonucleases are found? Why they are called as molecular scissors?

Answer the following: (a) Take Sarita's present age to be y years (ii) What was her age 3 years back?

Examine the given defective crystal and {:(A^(+),B^(-),A^(+),B^(-),A^(+)),(B^(-),0,B^(-),A^(+),B^(-)),(A^(+),B^(-),A^(+),0,A^(+)),(B^(-),A^(+),B^(-),A^(+),B^(-)):} Answer the following questions : (i) What type of stoichiometirc defect is shown by the crystal ? (ii) How is the density of the crystal affected by this defect ? (iii) What type of ionic substances show such defect ?