Worksheet Chapter 5: Response in Plants

1. State two physiological functions of Abscisic Acid (ABA) in plants.

2. Explain why decapitating (cutting off) the apical bud of a plant leads to a bushier plant structure.

3. Describe how auxin distribution brings about positive phototropism in a plant shoot exposed to light from one side.

4. Distinguish between Tropism responses and Nastic responses in terms of response direction and reversibility.

5. Which phytohormone is used commercially in gaseous form to synchronize fruit ripening during transportation?

6. True or False: Nastic responses in plants are permanent growth movements driven by cell division.

7. Explain how two different phytohormones can be applied commercially in the agricultural industry to produce seedless fruits and extend fruit shelf life.

8. A seedling is placed horizontally in total darkness. Predict and explain the growth responses observed in the shoot and the root after several days based on auxin distribution.

9. Fill in the blank: The directional growth response of a plant organ in response to an external light stimulus is known as ________.

10. True or False: In a horizontal root, high auxin concentration on the lower side inhibits cell elongation, causing the root to curve downward.