6) Which of the following does not fall in the biotic component of the ecosystem? a) water
b) animals c) plants
d) grass
7) The water and the mineral ions from the soil till the tip of the plant is made availab
tube like structure called
a. Guard cell. (6) Stomata c. Xylem d. Small hole.
8) The student peeled off a green leaf and observed it under a microscope. What sha
is expected to be seen by the students?
a) Oval
b) cylindrical
c) conical
d) rectangul
9) Lack of calcium in the diet causes
a) Anemia b) simple goiter c) poor growth of bones and teeth
d) to
1

6.grass

7.xylem

8.oval

9. poor growth of bones and teetn

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

b.

the accuracy of the data.