Plasticity is defined as the phenomenon in which the plants follow different pathways in response to the environment or phases of life to form different kinds of structures. It is seen in some plants like heterophylly in cotton and coriander larkspur. The environmental plasticity is best seen in emergent hydrophytes, e.g. buttercup. Different shapes of leaves appear in air and water in buttercup.

Development is a process in which the changes occur in the organism throughout its entire life. In plants, it starts with germination of seeds and continues till senescence.

MEDIUM

Earn 100

During which stage of human development does the most rapid physical growth occur?

50% studentsanswered this correctly

Important Questions on Motion in a Straight Line

MEDIUM

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Sensitive whiskers are found in

EASY

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

A particle shows the distance-time curve as shown in the figure. The maximum instantaneous velocity of the particle is around the point.

Question Image

EASY

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Identify the exponential growth expression among the following.

EASY

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Two cars

P

and

Q

start from a point at the same time in a straight line and their positions are represented by

X_{P} (t) = a t + b t^{2}

and

X_{Q} (t) = f t - t^{2}

. At what time do the cars have the same velocity?

EASY

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Typical growth curve in plants is:

EASY

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Define plasticity.

HARD

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

A rubber band stretches and reverts to its original position. Bubble gum stretches, but it would not return to its original position.

Is there any difference between the two processes? Discuss it with respect to plant growth. [Hint: Elasticity (reversible) Plasticity (irreversible)]

HARD

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Define growth, differentiation, development, dedifferentiation, redifferentiation, determinate growth, meristem and growth rate.

MEDIUM

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

'Both growth and differentiation in higher plants are open'. Comment.

EASY

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

The sequence of steps in the history of an organism is called

EASY

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Define development

MEDIUM

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Mention what do you understand by the term plasticity in plants. Is it followed by every plant? What is the function of heteroblastic development in plants?

MEDIUM

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Plasticity in plant growth means that

MEDIUM

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Plasticity in plant growth means that:

EASY

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

Define plasticity. Give an example.

MEDIUM

Physics>Mechanics>Motion in a Straight Line>Instantaneous Velocity and Speed

What is sigmoid curve?