Question

solve the question ​

Answer 1

Answer:

: Control and coordination in plants is performed by chemical substances known as plant hormones or phytohormones. ... Plants respond to photoperiodic stimulus by specialized pigment present in very small quantity called phytochrome.

Answer 2

Answer:

Here, Ratio of perimeters of similar triangle ABC and triangle PQR = 35/45 = 7/9

We know, that ratio of areas of two similar triangles is equal to the ratio of their sides.

So, AB/PQ = 7/9

We also know, that ratio of areas of two similar triangles is equal to the square of ratio of the respective sides.

So, area of triangle ABC/area of triangle PQR = AB^2/PQ^2 = (7)^2/(9)^2

49/81

i.e. 49:81 is your answer.

Hope it works...