What is the specific function of the cardiac muscle?
(1) Cardiac muscles cells are round and hollow, fanned and uninucleated.
(2) They are compulsory muscles.
(3) They show musical withdrawal and unwinding all through life.
(4) Their musical withdrawal and unwinding helps in siphoning the heart.
Diagrammatically show the difference between the three types of muscle fibres.
What does a neuron look like?
Draw a labelled diagram of a neuron.
Complete the table:
Give three features of cardiac muscles.
Where is apical meristem found?
What are the functions of the stomata?
How many types of elements together make up the xylem tissue? Name them.
What is a tissue?
What are the constituents of phloem?
Which of the following has more inertia: (a) a rubber ball and a stone of the same size? (b) a bicycle and a train? (c) a five-rupees coin and a one-rupee coin?
State the universal law of gravitation.
Which of the following are matter?
Chair, air, love, smell, hate, almonds, thought, cold, cold-drink, smell of perfume.
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
What is meant by a pure substance?
How does the sound produced by a vibrating object in a medium reach your ear?
In a reaction, 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9 g water and 8.2 g of sodium observations are in agreement with the law of conservation of mass.
sodium carbonate + ethanoic acid → sodium ethanoate + carbon dioxide + water
What are canal rays?
State any two conditions essential for good health.
How is our atmosphere different from the atmospheres on Venus and Mars?
A bullet of mass 10 g travelling horizontally with a velocity of 150 m s-1 strikes a stationary wooden block and comes to rest in 0.03 s. Calculate the distance of penetration of the bullet into the block. Also calculate the magnitude of the force exerted by the wooden block on the bullet.
How are fish obtained?
Why is it not possible to see an atom with naked eyes?
On the basis of Rutherford’s model of an atom, which sub-atomic particle is present in the nucleus of an atom?
Why is water essential for life?
What would happen to the life of a cell if there was no Golgi apparatus?
What is loudness of sound? What factors does it depend on?
If one mole of carbon atoms weighs 12 gram, what is the mass (in gram) of 1 atom of carbon?
Why do organisms need water?
Why are we normally advised to take bland and nourishing food when we are sick?