Which of the following factors is responsible for change of seasons ?
(B) The revolution of the Earth
(D) None of these.
These are membrane bound vacuolar organelles discovered by de Duve in 1949. They mostly occur in animal cells but they have also been reported in plant cells. They are concerned with the waste disposal system of the cell.
The cell organelles referred to in the above paragraph are
(B) Golgi bodies
it should be lysosomes right...
In which of the following activities is work done
(A) A boy shaking a tree
(B) Ali pushing against the wall
(C) A man pushing a stalled car
(D) A worker pushing a loaded car.
In options C and D, it is not indicated whether the car has moved or not. How do I then understand as to whether work has been done or not?