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

Nephridia of Earthworms are performing the same functions as

How many base pairs are found in one turn of DNA?

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?

Answer the following : What type of bond is present in network solid ?

Consider the following figure. Answer the following questions (i) What are the roots of the f(x) = 0? (ii) What are the roots of the f(x) = 4? (iii)What are the roots of the f(x) = g (x)?

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?

A number of four different digits is formed with the use of the digits 1,2,3,4 and 5 in all possible ways. Find the following (i) How many such numbers can be formed? (ii) How many of these are even? (iii) How many of these are exactly divisible by 4?