Improvement in Food Resources — Science STD 9 — Question

The science of naming organism is called:

1. Identification.
2. Nomenclature.
3. Classification.
4. Taxonomy.

A student sitting at the top of a tree has ...... than the student who is sitting on the ground:

Nif genes occur in:

1. Rhizobium.
2. Streptococcus.
3. Penicillium.
4. Aspergillus.

The element which is not common between the compounds called baking soda and soda ash is:

Water drops fall at regular intervals from a roof at of 125m from the ground. At an instant when 11th drop is about leave the roof and 1st drop is at a height of 45m from the ground at that instant the dist of 10th drop from the roof is (g=10 m/ s²)

Hotspots of biodiversity means:

1. Areas of the Earth that contain many endemic species.
2. Species serves as proxy for entire communities in particular areas.
3. Species in particular niche/ area.
4. Species diversity at particular areas.

You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture?

1. Evaporation.
2. Simple distillation.
3. Fractional distillation.
4. Crystallization.

The anion of an element has:

Dry ice is:

Four balls, A, B, C and D displace 10mL, 24mL, 15mL and 12mL of a liquid respectively, when immersed completely. The ball which will undergo the maximum apparent loss in weight will be:

1. A
2. B
3. C
4. D