control and coordination in plants icse Quiz

The chemical substances which control growth and development in plants are called:

• Enzymes

• Hormones

• Vitamins

• Proteins

Which of the following is NOT a plant hormone?

• Auxin

• Gibberellin

• Insulin

• Cytokinin

Auxin was first discovered in:

• Root tips

• Coleoptile tip of oat seedlings

• Stem apex

• Flower buds

The hormone responsible for apical dominance is:

• Cytokinin

• Auxin

• Gibberellin

• Abscisic acid

Which hormone promotes cell elongation?

• Auxin

• Cytokinin

• ABA

• Ethylene

Cytokinins are primarily responsible for:

• Inhibiting seed germination

• Cell division

• Root elongation

• Leaf fall

Gibberellins mainly cause:

• Cell elongation and stem growth

• Inhibition of growth

• Leaf abscission

• Wilting of leaves

Which hormone is known as the “stress hormone” in plants?

• Gibberellin

• Cytokinin

• Abscisic acid

• Ethylene

The natural plant hormone that promotes ripening of fruits is:

• Auxin

• Ethylene

• ABA

• Cytokinin

Leaf abscission is mainly promoted by:

• Auxin

• Gibberellin

• Cytokinin

• Abscisic acid