Which of them can fix atmospheric nitrogen- Mycorrhiza of Pinus or Coralloid roots of cycas? Why?

An element is involved in the formation of mitotic spindle. Which part of the plant do you expect it to be present? Why? Name the element. Where else can it be present?

In the five kingdom system of classification , which single kingdom out of the following include nitrogen-fixing bacteria and methanogenic archae bacteria?

Which of the following statements are true? If false, correct them: Nitrogen as a nutrient element, is highly immobile in the plants.

In which of the following does adsorption takes place and why? Anhydrous CaCl_2 placed in the atmosphere saturated with water.

A company sells biscuitws. For packing purpose they are using cuboidal boxes : box A rarr 3 cm xx 8 cm xx 20 cm, box B rarr 4 cm xx 12 cm xx 10 cm . What size of the box will be econmical for the company? Why? Can you suggest any other size (dimensions) which has the sdame volumne but is more economical than these?

In which of the following does adsorption takes place and why? Silica gel placed in the atmosphere saturated with water.

Look at leaves of the same plant on the shady side and compare it with the leaves on the sunny side. Or, compare the potted plants kept in the sunlight with those in the shade. Which of them has leaves that are darker green? Why?