There are intemational standards regarding drinking water. Write any three among them.

Many of the flowering plants have developed some devices for discouraging inbreeding. Write any two of them.

Organisms are influenced by biotic and abiotic factors. Write any three abiotic environmental factors.

The graph given below is oxygen-haemoglobin dis sociation curve. Observe the graph and answer the following questions. Write any three factors favorable for the formation of oxyhaemoglobin in alveoli.

In a science fair, a debate based on 'Position of Hydrogen in the periodic table" was condùcted. Imagine that you were a participant in the debate arguing for including hydrogen along with alkali metals. i. Write any three statements you would have made in the debate in order to establish your árgument. ii. If Raju was in the opposite side arguing for including hydrogen with halogens, how would he have countered your arguments?

Population interaction may be beneficial or not. Write any three ineractions in detail.

Three Galvanic cells are given: Find out the most reactive metal and least reactive metal among them.

Physisorption and chemisorption are the two types of adsorption. Write any four differences between them.