Fill in the blanks

Gibberellins and auxins promote growth in plants while abscisic acid arrests the same. Some situations are discussed here, State which hormones would be needed and why?

A. A gardener wants large dahlias he should use along with nutrients and other things ____auxin_______hormone.

B. In a dwarf plant the branches have to be thickened one would use ___ethylene_____ hormone.

C. Seeds are to be stored for a long time ____abscisic acid______ hormone can help.

D. Cutting the apex or tip of plants so that there are several lateral buds ___auxin_______ hormone can be used.

E. The part of the brain that helps you in solving puzzles is _____cerebrum______.

A. The most fundamental activity of auxin is cell enlargement. Cell enlargement is caused by solubilization of carbohydrates, loosening of wall microfibrils, synthesis of more wall materials, increased membrane permeability and respiration.

B. Ethylene is a gaseous hormone which stimulates transverse or isodiametric growth but retards the longitudinal one. Ethylene inhibits longitudinal growth but stimulates transverse or horizontal growth and swelling of axis.

C. Seed dormancy is mainly caused by abscisic acid . Dormancy allows seed to tolerate dessication and extremes of temperature better. The buds as well as seeds sprout only when abscisic acid is overcome by gibberellins. Because of its action in inducing dormancy , abscisic acid or ABA is also named as dormin.

D. Auxins are weakly acidic hormones promoting cell elongation especially of shoots at a concentration less than 100 ppm which is inhibitory to the roots. Among the growth regulators auxins were the first to be discovered. Cell elongation is the fundamental activity of auxins. Auxin is known to promote cell division of vascular cambium. Auxin promotes root initiation at a concentration which is inhibitory for growth of intact root.

In apples, flowers and fruits are formed on dwarf shoots. Application of naphthalene acetic acid increases the number of dwarf shoots as well as the number of fruits.

E. Cerebrum is the largest part of brain. Each lobe of cerebral hemisphere performs specific function . In the frontal lobe creative ideas occur. In the temporal lobe sounds are interpreted. In the parietal lobe feelings about touch ,hot and cold and pain are registered. It is this area that allows to accurately follow directions on map, reading a clock and dressing a person. The occipital lobe is one where eyes interpret what is seen.