Question

1. Water potential is the

(a)difference between pressure potential and osmotic potential.

(b)summation of pressure potential and solute potential.

(c)difference between pressure potential and solute potential.

(d)product of pressure potential and osmotic potential.

(e)combination of turgor pressure and pressure potential.

2. Which of the following are plant secondary metabolites that defense against herbivores? (can choose more than one answers)

(1) Lectins

(2) Cytokinin

(3) Cyanide

(4) Phospholipids

(5) Protease Inhibitors

3. Which of the following is a function mediated by Herbivore-induced plant volatiles (HIPVs)? (can choose more than one answers)

(1) Intoxicate the herbivorous insects

(2) Attract carnivorous insects

(3) Communicate with the neighboring trees

(4) Stimulate insects to lay eggs

Answer 1

1) Answer is option b

Water potential is the summation of pressure potential and solute potential. Water potential indicates in which way water will flow. This flow of water is dependent upon water potential. Water moves from higher water potential to lower water potential. There is an inverse relationship between water potential and solute concentration.

2) Answer is option 1, 3 & 5

Cyanogenic glycosides are one of the secondary metabolites released by plants. Cyanogenic glycosides release poisonous gas hydrogen cyanide (HCN).

Lectins are carbohydrate binding proteins. Lectins bind to epithelial cell lining of the digestive tract of herbivores and interfare with the absorption of nutrients.

Proteinase inhibitors inhibit various digestive proteases.

3) Answer is option 1& 3.

The volatiles which are released by plants on herbivore attack, intoxicate herbivorous insents along with thses help to establishment of communication between neighbouring plants so that those plants start to take preparative measures before herbivore attack.