Given below is an experimental setup to demonstrate a particular tropic movement

Plant Physiology (10)

Given below is an experimental setup to demonstrate a particular tropic movement in germinating seeds. Study the diagram and answer the questions that follow:

 

1. Label the parts 1 and 2.
2. Name the tropic movement shown by part 1.
3. Part 1 is affected by two stimuli. Name them. Which one of the two is stronger?
4. What is Thigmotropism? Give one example.
5. What is meant by ‘Positive’ and ‘Negative’ tropic movements in plants?

Answer

(i) 1. Radicle; 2. Plumule

(ii) Hydrotropism

(iii) Gravity, water / moisture; Water is stronger

(iv) Movement of plant in response to touch stimulus.; Pea, Vines, Cuscuta, cucumber

(v) Movement towards stimulus is positive. Movement away from stimulus is negative.

• Exam Year: 2019