The Fundamental Unit of Life Important Questions : Solution Define nucleoid.Ans:- The nucleoid is an irregularly shaped region within the prokaryotic cell that contains all or most of the genetic material. . Why mitochondria is called the powerhouse of the cell ? Why is the inner membrane of mitochondria deeply folded ?Ans:– 1. Mitochondria is […]
Motion Important Questions : Solution Define uniform circular motion and give example of it. Why is it called accelerated motion? Sol:- Uniform circular motion can be described as the motion of an object in a circular path at a constant speed.Example:- Motion of an electron around the nucleus in a circular orbit, motion of the […]
Tissues Important Questions Which tissue in plants provides them flexibility? Name any two parts of the plants where this tissue is present. What is responsible for increase in girth of the stem or root? What is cutin? What is its function? Which tissue forms a barrier to keep different body systems separate? Write the differences […]
Statistics – Important Questions Mean of 20 observations is 17. If in the observations, observation 40 is replaced by 12, find the new mean What is the mean of first 10 natural numbers? The mean of 100 observations is 50. If one of the observation which was 50 is replaced by 150 then what will […]
Surface Areas and Volumes Important Questions A conical tent is 10 m high and the radius of its base is 24 m. Find the slant height of the tent. If the cost of 1 m2 canvas is ₹ 70, find the cost of canvas required to make the tent. A man uses a piece of […]
Heron’s Formula – Important Questions The sides of a triangular plot are in the ratio of 6 : 7 : 8 and its perimeter is 420 m. Find its area. The height of an equilateral triangle is 6 cm. Find its area. Find the area of a right-angled triangle whose base is 12 cm and […]
Constructions – Important Questions Construct an equilateral triangle, given its side and justify the construction. Construct a triangle ABC in which BC = 8cm, ∠B = 75° and AB + AC = 14 cm. Draw a line segment AB of 6 cm in length. Draw a line perpendicular to AB through A and B, respectively. […]
Circles – Important Questions Prove that if chords of congruent circles subtend equal angles at their centres, then the chords are equal. Draw different pairs of circles. How many points does each pair have in common? What is the maximum number of common points? If two circles intersect at two points, prove that their centres […]
Areas of Parallelograms and Triangles Important Questions If AD is one of the medians of a triangle and P is a point on AD. Prove that ar(∆BDP) = ar(∆CDP) ar(∆ABP) = ar(∆ACP) In the adjoining figure, D is the mid-point of side AB of ∆ABC and P is any point on BC. If CQ||PD meets […]
Quadrilaterals Important Questions Show that each angle of a rectangle is a right angle. Find all the angles of a parallelogram if one angle is 60°. Two parallel lines l and m are intersected by a transversal p (See in fig.). Show that the quadrilateral formed by the bisectors of interior angles is a rectangle. […]