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

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?

Some of the elements and their atomic numbers are mentioned in the following table : (i) How many valence electrons are there in the element 'R' ? (ii) What is the valency of 'P' ? (ii) Write the chemical formula of the compound formed by combining the elements ‘P' and 'Q'? (iv) Out of the two elements 'P' and 'S', which one is larger in size ?

The position of eight elements in the modern periodic table is given below where atomic numbers of elements are given in the parenthesis. (i) Write the electronic configuration of Ca. (ii) Predict the number of valence electrons in Rb. (iii) What is the number of shells in Sr ? (iv) Predict whether K is a metal or a non-metal. (v) Which one of these elements has the largest atom in size ? (vi) Arrange Be, Ca, Mg and Rb in the increasing order of the size of their respective atoms.

The structural formula of ten compounds, (I) through (X) are drawn below, you may select any one of these structure. Answer the following question about that compound. A. How many chiral centre are present in this compound ? (a) 0 (b) 1 (c) 2 (d) 3 (e) 4 (f) 5 B. Is this compound chiral or achiral ? C. What symmetry element are present in this compound ? (a) None (b) Plane of symmetry (c) Center of symmetry

A metal is treated with dilute sulphuric acid. The gas evolved is collected by the method shown in the figure: (i) Name the gas (ii) Is the gas soluble or insoluble in water? (iii) Is the gas lighter or heavier than air? (iv) How will you test the gas (v) IF the metal used above in zinc then write the chemical equation for the evolution of gas (vi) Write one industrial use of the gas evolved.

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of electronic shells but different in their outermost shells. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. Oxides of the elements A and B are basic in nature while those of E and F are acidic. The oxide of elements D is almost neutral. Answer the following questions based on the information given here in : (i) To which group or period of the periodic table do the listed elements belong ? (ii) Which one of the eight elements is likely to be a noble gas? (iii) Which one of the eight elements would have the largest atomic radius ? (iv) Which two elements amongst these are likely to be the non-metals? (v) Which one of these eight elements is likely to be a semi-metal or metalloid ?

Distinguish between unisexual and bisexual flowers giving one example of each. Draw a neat diagram showing fertilisation in a flower and label: a] Pollen tube b] Male germ cell c] Female germ cell, on it. OR Draw the diagram showing the germination of pollen on stigma and label the part on which pollination takes place. Answer the following questions based on diagram given aside. i] Name the part marked 'P. in the diagram. ii] How does 'P. reach part 'B'? iii] State the importance of the part 'C'. iv] What happens to the part marked 'D' after fertilisation is over? Mention the role of gamete and zygote in sexually reproducing organisms.