Why is fern Azolla frequently grown with the rice crop?

Which crops can be grown along with wheat during mixed cropping practices ?

Certain species of wasps are seen to frequently visit flowering fig trees. What type of interaction is seen between them and why?

Why all the crops do not grow in the same season?

Why is gene encoding for "ory protein" inserted into crop plants ?

Why is the colour of a leaf kept in the dark frequently yellow, or pale green?

Why most of the ferns are found in moist areas?