4. Which scientist showed that the green
substances in plant (chlorophyll) is
located in special bodies (chloroplast)
within plant cells?
(A) Julius von Sachs
(B) Cornelius van Neil
(C) T.W. Engelmann
(D) Jan Ingenhousz
Answers
Though many people have provided the answer and solution to this question with their approach, and all of them are right and commendable.
I am providing the solution of the same with my approach which can be done orally/verbally. Let’s have a look at it.
The initial value of the area of the rectangle in the percentage = 100%
the percentage increase in length will also be the same percentage increase in the area so
the new area will be 100 + 15 = 115 % of the original area.
now we will apply the next calculation on 115 %.
again the width was decreased by 20% so the area will also decrease by 20%.
first we find the 20% of 115 = 115*20/100 = 23
decrease means subtract it from the area = 115–23 = 92
the new area will be 92% of the original area which was 100%
so we clearly see that the final area will be decreased by 8%.
Explanation:
Ingenhousz