List five main groups of natural plant growth regulators. Write a note on discovery, physiological functions and agricultural/horticultural applications of any one of them.

Write a note on agricultural / horticultural applications of auxins.

Name three groups of plants that bear archegonia. Briefly describe the life cycle of any one of them.

The deficiencies of micronutrients, not only affects growth of plants but also vital function such as photosynthesis and mitrochondria electron flow. Among the list given below, which group of three elements shall affect most, both photosynthesis and mitrochondrial electron transport ?

Consider the following collection of numbers 1,(1)/(2),-2,0.5,4(1)/(2),(-33)/(7),0,(4)/(7),0.bar3,22,-5,(2)/(19),0.125 . Write these numbers under the appropriate category. [A number can be written in more than one group] (i) Natural numbers ____________ (ii) Whole numbers __________ (iii) Integers __________ Rational numbers __________ Would you leave out any of the given numbers from rational numbers? Is every natural number, whole number and integer is a rational number ?