Chemical Reactions and Equations — Science STD 10 — Question

What is added to groundnut oil when it is to be converted to vanaspati ghee?

What is the importance of the digester of a bio-gas plant?

Select the mis-matched pair in the following and correct it.

a.	Biomagnification	Accumulation of chemicals at the successive trophic levels of a food chain.
b.	Ecosystem	Biotic components of environment.
c.	Aquarium	A man-made ecosystem.
d.	Parasites	Organisms which obtain food from other living organisms.

Name the process which is involved in the formation of a rainbow.

What percentage of the solar energy is trapped and utilised by the plants?

Name the energy obtained from sea or ocean water due to the difference in temperature at the surface and in deeper sections of these water bodies.

Name the following:
Organisms that cannot prepare their own food.

Where should an object be placed in front of the concave mirror so as to obtain its virtual, erect and magnified image?

What is the name of the reproductive process:
Which involves only one parent?

Answer the following:
Which endocrine gland is present in males but not in females?