Question

1.1 Heredity and hereditary changes :
TT:​

Answer 1

Answer:

Heredity can be defined as the process of transmission of the characters from the parents to the offspring through the mode of reproduction. Hereditary changes can occur due to the following changes: Natural Selection- One allele is fixed for the population as it provides a survival advantage.

Answer 2

in cylinder

diameter is 12 cm

hence radius will be 6cm

height is 15 cm

volume of cylinder is

πr^2h

π ×6×6×15 cm ^3

now, volume of 1 toy

2/3 × πr^3 + 1/3 πr^2 h

1/3 πr^2 ( 2r + h)

height of cone is 3 times r

h = 3r

as 12 toys were recasted..

volume of 12 toys = volume of cylinder

12 ×1/3 πr^2 ( 2r + h) = πr^2h

4 πr^2 ( 2r + 3r ) = π ×6×6×15

4 r^2 (5r) = 6×6×15

r^3 = 6 ×6×15/4×5

r ^3 = 3 ×3×3

r = 3 cm

radius of sphere is 3 cm

height of conical part is 3 ×3 = 9 cm

height of toy is 3 +9 = 12

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