Sound — Science STD 9 — Question

Categorise the cells on the basis of presence or absence of nuclear membrane.

Which method can be used to separate a mixture of naphthalene and common salt?

Hybridisation involves crossing of genetically similar plants.

As the altitude of a body increases, do the weight and mass both vary?

How are diseases transmitted in crops?

Which of the following are not compounds? Chlorine gas, Potassium chloride, Iron powder, Iron sulphide, Aluminium foil, Iodine vapour, Graphite, Carbon monoxide, Sulphur powder, Diamond.

Given examples of different rabi and kharif crops.

Fill in the blanks:
A total of ______ nutrients are essential to plants.

Which parameters to health are difficult to measure?

Name any two micronutrients, required by plants.