Given here are some figures.Classify each of them on the basis of the following:(a)Simple curve (b) Simple closed curve (c)I polygon (d)Convex polygon (d)concave polygon.

Classify each of the following as pure substances or mixture, (a) Ethyl alcohol,(b) Oxygen, ( c) Blood, (d) Carbon, (e) Steel, (f) Distilled water.

In the following table, the positions of six elements A, B, C, D, E and F are given as they are in the Modern Periodic Table : On the basis of the above table, answer the following questions : (i) Name the element which forms only covalent compounds. (ii) Name the element which is a metal with valency three. (iii) Name the element which is a non-metal with valency three. (iv) Out of B and C, whose atomic radius is bigger and why? (v) Write the common name for the family to which the elements D and F belong.

Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table : On the basis of the above table, answer the following questions : (i) Name the element which forms only covalent compounds. (ii) Name the element which is a metal with valency three. (iii) Name the element which is a non-metal with valency three. (iv) Out of D and E, which is bigger is size and why ? (v) Write the common name for the family to which the elements C and F belong.

Figure 13.10 shows the effect of light on the rate of photosynthesis. Based on the graph, answer the following questions: (a) At which point/s (A, B or C) in the curve is light a limiting factor? (b) What could be the limiting factor/s in region A? (c) What do C and D represent on the curve?

Find the areas of the following figures by counting square: (a),(b),( c), (d), (e), (f), (g), (h), (i), (j), (k), (l),(m),(n)

Examine whether the following are polygons. If any one among them is not, say why? (d)

Three coins are tossed once. Let A denote the event 'three heads show", B denote the event "two heads and one tail show", C denote the event" three tails show and D denote the event 'a head shows on the first coin". Which events are (i) mutually exclusive? (ii) simple (iii) Compound?

Name the interaction in each of the following: (a) Ascaris worms living in the intestine of Human (b) Wasp pollinating fig inflorescence (c) Clown fish living among the tentacles of Sea anemone (d) Disappearance of smaller barnacles when Balanus dominated in the coast of Scotland. (e) Five closely related species of warblers living on the same tree.

State one property of each of the following which makes them suitable for the followng: a. Copper and aluminium for making electric wires b. Gold, platinium and silver are used to make jewellery c. Copper to make hiot water tank d. Graphite in making electrodes e. Alloys for making bells and strings in musical instruments.