Chapter 15 – Plant Growth And Development

Ethylene is used for

• a.Retarding ripening of tomatoes
• b.Hastening of ripening of fruits
• c.Slowing down ripening of apples
• d.Both b and c

Coconut water contains

• a.ABA
• b.Auxin
• c.Cytokinin
• d.Gibberellin

The affect of apical dominance can be overcome by which of the following hormone:

• a.IAA
• b.Ethylene
• c.Gibberellin
• d.Cytokinin

Match the following: A. IAA i. Herring sperm DNA B. ABA ii. Bolting C. Ethylene iii. Stomatal closure D. GA iv. Weed-free lawns E. Cytokinins v. Ripening of fruits Options:

• a.A – iv, B – iii, C – v, D – ii, E – i
• b.A – v, B – iii, C – iv, D – ii, E – i PLANT GROWTH AND DEVELOPMENT 85 c A – iv, B – i, C – iv, D – iii, E – ii d A – v, B – iii, C – ii, D – i, E - iv

Apples are generally wrapped in waxed paper to

• a.Prevent sunlight for changing its colour
• b.Prevent aerobic respiration by checking the entry of O2.
• c.Prevent ethylene formation due to injury
• d.Make the apples look attractive

Growth can be measured in various ways. Which of these can be used as parameters to measure growth

• a.Increase in cell number
• b.Increase in cell size
• c.Increase in length and weight
• d.All the above

The term synergistic action of hormones refers to

• a.When two hormones act together but bring about opposite effects.
• b.When two hormones act together and contribute to the same function.
• c.When one hormone affects more than one function.
• d.When many hormones bring about any one function.

Plasticity in plant growth means that

• a.Plant roots are extensible
• b.Plant development is dependent on the environment
• c.Stems can extend
• d.None of the above

To increase sugar production in sugarcanes, they are sprayed with

• a.IAA
• b.Cytokinin
• c.Gibberellin
• d.Ethylene

ABA acts antagonistic to

• a.Ethylene
• b.Cytokinin
• c.Gibberlic acid
• d.IAA

Monocarpic plants are those which

• a.Bear flowers with one ovary
• b.Flower once and die
• c.Bear only one flower
• d.All of the above

The photoperiod in plants is perceived at

• a.Meristem
• b.Flower
• c.Floral buds
• d.Leaves

The rice seedlings infected with fungus Gibberlla fujikuroi is called foolish seedlings. What was the reason behind it?

Label the diagram

• a.This is which part of a dicotyledonous plant?
• b.If we remove part 1 from the plant, what will happen? 2

Both animals and plants grow. Why do we say that growth and differentiation in plants is open and not so in animals? Does this statement hold true for sponges also?

Define parthenocarpy. Name the plant hormone used to induce parthenocarpy.

While eating watermelons, all of us wish it was seedless. As a plant physiologist can you suggest any method by which this can be achieved?

A gardener finds some broad-leaved dicot weeds growing in his lawns. What can be done to get rid of the weeds efficiently?

On germination a seed first produces shoot with leaves, flowers appear later,

• a.Why do you think this happens?
• b.How is this advantageous to the plant?

Fill in the blanks:

• a.Maximum growth is observed in ________ phase.
• b.Apical dominance is due to ____________ .
• c.___________ hormone initiate rooting.
• d.Pigment involved in Photoperception in flowering plants is ______.