The heart like pumping organ in insect is________?

Fertilization of egg & sperm takes place in the ________?

The body of an insect is covered by a protective ________ formed from chitin and protein. Depending upon its precise composition and thickness, the cuticle may be soft and flexible or hard and rigid; according to requirements, it may or may not be permeable or waterproof:

Which of the following nutrient play the most effective role in controlling rate of transpiration:

In seed formation the outer integument of the ovule shrinks and forms the seed coat, is called as________?

________% of total global water is fresh and its major portion is obtained from Rains?