Abscisic Acid

Go through the following matches (i) Cytokinis- Inhibits secondary cambial growth (ii) Ethylene - Prevents senescence (iii) Abscisic acid- Stops cambial activity (iv) Ethylene -Inuces seed & bud dormancy Which of these are correct

Which statements are correct ? a - Cytokinins suppress the synthesis of chlorophyll b - Auxins control apical dominance c - Gibberellins promote shoot elongation d - Abscisic acid enables seeds to with-stand desiccation.

Match column I with column II and select the correct option from the codes given below, {:(Column I,Column II),(A."Auxin",(i)"Fruit ripening"),(B."Cytokinins",(ii)"Phototropism"),(C."Abscisic acid",(iii)"Antagonist to" GAs),(D."Ethylene",(iv)"Growth of lateral buds"):}

The following statements are given about different plant growth hormones : I. Cytokinin suppresses the synthesis of chlorophyll. II. Auxins control apical dominance. III. Gibberellins promote shoot elongation. IV. Abscisic acid enables seeds to withstand desication. Which of the above statements are correct?

Match the columns and find the correct combination : {:(," I",," II"),(a,"Auxin",1.,"Herring sperm DNA"),(b,"Cytokinin",2,"Inhibitor of growth"),(c,"Gibberellin",3.,"Apical dominance"),(d,"Ethylene",4.,"Epinasty"),(e,"Abscisic acid",5.,"Induces amylase synthesis"):}

Read the following matches (i) Auxins - Promotes abscission of older mature leaves and fruits (ii) Gibberellins - Stimulation of internodal growth (iii) Abscisic acid - Stops cambial activity (iv) Ethylene-Induces seed & bud dormancy Which of these are correct

Fill in the blanks: (A) Ethylene is synthesized in tissue undergoing ....and..... fruits. (B) Abscisic acid acts as a general....of growth and metabolism. (C) ......is a period between complete materity and final death of an organ or organism. (D) ....were first plant hormones to be discovered. (E) ....means the testing of chemical substance for its activity in causing a growth response in a living plant or its part.

Match the plany hormones listed in column I with their major role listed in column II and select the correct option from the codes given below {:(,"Column I",,"Column II"),("(A)","Auxin","(i)","Fruit ripening"),("(B)","Cytokinin","(ii)","Phototropism"),("(C)","Abscisic acid","(iii)","Suppression of cell division"),("(D)","Ethylene","(iv)","Stomatal opening and closing"),(,,"(v)","Growth of lateral buds"):}

Stomatal movements are influenced by a number of environmental factors, Which of the following statements is // are incorrect regarding this? (ii)Blue light keeps stomata open during the day pormoting the movement of K_(+) ions into guard cells. (ii) Increased CO_(2) concentraation reduces the pH of guard cells which promotes conversion of sugar into starch ultimately causing closure of stomata. (iii) Abscisic acid under stress conditions, causes repid movement of K_(+) ions into guard cells. Highly concentrated sucrose or salt solution when applied over to stomata results in stomata opening.