Give reason when Big buildings and dams have wide foundations for safety.

Give reasons, why? Rhizobium aggregates have been noticed at specific sites on curved root hairs.

Give reasons for the following: iron is used in constructing bridges and dams.

Give any two reasons why the patent on Basamati should not have gone to an American Company.

Give reasons for the following: Noble gases have very little tendency towards liquefaction.

Long Answer Questions Five mark Each QUESTIONS FROM CBSE BOARD EXAMINATIONS : A flower of tomato plant following the process of sexual reproduction produces 240 viable seeds. Answer the following questions giving reasons: (a) What is the minimum number of pollen grains that must have been involved in the pollination of its pistil? (b) What would have been the minimum number of ovules present in the ovary? (c) How many megaspore mother cells were involved? (d) What is the minimum number of microspore mother cells involved in the above case? (e) How many male gametes were involved in this case?

Give reasons for the following statement- Safety Lockers are made up of an alloy

A baker found that a cake prepared by him is small in size and hard which consitutent, he forget to add, due to which cake can become soft and big.give reason.

Give the reasons for the following statement: Enzymes generally have different pH but same temperature optima.

Which of the following sentences are statement? Give reason for your answer. The sides of a quadrilateral have equal length