English Medium इयत्ता ९ - CBSE Question Bank Solutions

The formula unit mass of Ca₃ (PO₄)₂ is ————.

Write the formulae for the following and calculate the molecular mass for each one of them.

1. Caustic potash
2. Baking powder
3. Limestone
4. Caustic soda
5. Ethanol
6. Common salt

Differentiate between rough and smooth endoplasmic reticulum. How is endoplasmic reticulum important for membrane biogenesis?

Fractional distillation is suitable for the separation of miscible liquids with a boiling point difference of about 25 K or less. What part of the fractional distillation apparatus makes it efficient and possess an advantage over a simple distillation process. Explain using a diagram.

One of the following processes is not a step involved in the water-cycle operating in nature

The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition?

There is mass mortality of fishes in a pond. What may be the reasons?

To solve the food problem of the country, which among the following is necessary?

Which one of the following species of the honey bee is an Italian species?

Which one of the following nutrients is not available in fertilizers?

Group the following and tabulate them as energy-yielding, protein yielding, oil yielding and fodder crop.

Wheat, rice, berseem, maize, gram, oat, pigeon gram, sudangrass, lentil, soybean, groundnut, castor and mustard.

Rabi crops are cultivated from ______to______.

Paddy, maize, green gram and black gram are ______ crops.

Wheat, gram, pea, mustard are ______ crops.

A total of ______ nutrients are essential to plants.

______ and ______ are supplied by air to plants.

______ is supplied by water to plants.

______ nutrients are needed in small quantity for plants and are called ______.

An Italian bee variety A. mellifera has been introduced in India for honey production. Write about its merits over other varieties.

Why beekeeping should be done in good pasturage?