What happens when :
Bryophyllum leaf falls on the wet soil?

What happens when :
On maturation sporangia of Rhizopus bursts?

State the basic requirement for sexual reproduction? Write the importance of such reproductions in nature.

State the changes that take place in the uterus when :
Implantation of the embryo has occurred.

State the changes that take place in the uterus when :
Female gamete/egg is not fertilised

Explain with the help of an example each, how the following provides evidence in favour of evolution:
Homologous organs

Explain with the help of an example each, how the following provides evidence in favour of evolution:
Analogous organs

Explain with the help of an example each, how the following provides evidence in favour of evolution:
Fossils

30.

An object 4 cm in height, is placed at 15 cm in front of a concave mirror of focal length 10 cm. At what distance from the mirror should a screen be placed to obtain a sharp image of the object. Calculate the height of the image.