A typical flower has a stalk called P. The uppermost part of stalk is wider and is known as Q. On the top of Q different whorls are present. The outermost whorl consists of green leaf-like structures called R. The inner whorl consists of S which are brightly coloured and scented.
What are P, Q, R and S ?
Manomay conducted an experiment where 4 identical
metal balls were allowed to roll down 4 similar curves
with surfaces of different texture. The time taken for
the ball to come to a complete stop for each of the
different surfaces was recorded in the table below.
Which curve has the roughest surface?
How can the roughest surface allow lesser stopping time? Answer to this question should be R. Please advise
An equilibrium state of a body is considered if all the forces acting on it
A are in the same direction
B are equal in magnitude
C have zero resultant
D can be arranged in pairs.
please help me what is equilibrium
Answer: (D) Over grazing by cattle will not help in soil conservation but will result in soil erosion. As plant roots hold the soil tightly thus they prevent its erosion. When plant over is removed by overgrazing, soil erodes away.
Which of the following statements is false regarding physical and chemical properties?
A The composition of matter need not be changed for observing a physical change.
B During a chemical reaction, molecules undergo a change and their concentration keeps decreasing along with time.
C Chemical property is the ability of matter to undergo some chemical change because of its composition.
D During a chemical reaction, same molecules are present throughout the change.