so it is not true that voltmetre polarity should always match cells polarity

in rainbow formation, which type of internal reflection takes place, partial or total ?? NCERT and S.Chand says total while HC Verma sir focuses on partial 

Which of the following is a micronutrient?

• A) Mg
• B) Zn/Cu
• C) Ca
• D) P

Which one of the following is non-biodegradable?

• a. DDT
• b. Vegetable peel
• c. Cardboard
• d. Bark of trees.

With the help of labelled diagrams explain the human male reproductive system.