English Medium इयत्ता ९ - CBSE Question Bank Solutions

Write down the desirable characters of bee variety suitable for bee keeping.

What is pasturage and how it is related to honey production?

For increasing production, what is common in poultry, fisheries and bee-keeping?

Explain the role of workers in a bee colony.

Name the Following :(C) ER Studded with Ribosomes

Write Down Two Main Functions of (A) Endoplasmic Reticulum

Where do lipids and proteins constituting the plasma membrane get synthesised?

Make sketch of hydrological cycle in nature.

Describe biological water cycles.

Explain water cycle in detail.

Discuss how water is replenished in sea

Define 'molecular mass' of a substance.

What is meant by saying that ‘the molecular mass of oxygen is 32’ ?

What is the significance of the formula H₂O ?

The molecular formula of glucose is C6H12O6. Calculate its molecular mass. (Atomic masses : C = 12 u ; H = 1 u ; O = 16 u)

Calculate the molecular masses of the following :

1. Hydrogen, H₂

(Atomic masses : H = 1 u ; O = 16 u ; Cl = 35.5 u ; N = 14 u ; C = 12 u)

Calculate the molecular masses of the following compounds :

Methanol, CH3OH

Calculate the molecular mass of ethanoic acid, CH₃COOH.
(Atomic masses : C = 12 u ; H = 1 u ; O = 16 u)

Calculate the molecular mass of nitric acid, HNO₃. (Atomic masses : H = 1 u ; N = 14 u ; O = 16 u)

Calculate the molecular mass of chloroform (CHCl3). (Atomic masses : C = 12 u ; H = 1 u ; Cl = 35.5 u)