Coordination in Plants Tropic Movements_unsolved paper
Chapter: Control and Coordination | Topic: Coordination in Plants Tropic Movements
COORDINATION IN PLANTS TROPIC MOVEMENTS_UNSOLVED PAPER
Topic: Coordination in Plants Tropic Movements
Q1.The directional growth response of a plant towards or away from a stimulus is called:
- Reflex action
- Tropic movement
- Circulation
- Respiration
Q2.Growth of a plant shoot towards sunlight is an example of:
- Geotropism
- Hydrotropism
- Phototropism
- Thigmotropism
Q3.Roots growing downward into the soil show:
- Positive geotropism
- Negative geotropism
- Positive phototropism
- Negative hydrotropism
Q4.Climbers such as pea plants coil around a support mainly due to:
- Phototropism
- Thigmotropism
- Hydrotropism
- Chemotropism
Q5. Which plant hormone mainly controls tropic movements by influencing cell elongation?
- Cytokinin
- Auxin
- Ethylene
- Abscisic acid
Q6. A potted plant placed near a classroom window bends toward the incoming sunlight. Which type of movement is shown?
- Hydrotropism
- Geotropism
- Phototropism
- Thigmotropism
Short questions
Q1. Define tropic movement. Name any two types of tropic movements found in plants.
Q2. Differentiate between phototropism and geotropism with one example of each.
Q3. Explain why roots generally show positive geotropism.
Q4. A money plant kept inside a room bends toward a nearby window after a few days. Explain this observation.
Q5. What is thigmotropism? Name one plant that exhibits this movement.
Q6. State the role of auxin in coordinating plant growth.
Q1. Describe the different types of tropic movements found in plants. Give one suitable example of each.
Q2. Draw a neat and labelled diagram to show phototropism in a plant shoot. Explain how auxin helps the shoot bend toward light.
Q3. A farmer observes that the roots of young seedlings grow deep into the soil while the shoots grow upward toward sunlight. Explain the role of different tropic movements in helping the plant survive and grow successfully.
Q1. A student measures the height of a sunflower plant for five consecutive days after placing it near a window.
Answer the following:
Calculate the total increase in height over the five days.
Calculate the average daily increase in height.
On which day was the plant the tallest?
Suggest one reason why the plant continued bending toward the window.
Q2. In a classroom experiment, 40 seedlings were observed for different tropic responses.
Answer the following:
How many seedlings showed a tropic response?
What percentage of seedlings showed phototropism?
What percentage showed no clear response?
Suggest one reason why some seedlings may not have shown a clear response.
Q3. Read the following situation:
A student places two identical potted plants in different locations. One plant is kept near a sunny window, while the other is kept in a dark cupboard for several days.
Based on your understanding of plant coordination:
Which plant is more likely to show phototropism?
Identify the stimulus responsible for the movement.
Name the plant hormone involved in this response.
Predict one visible difference between the growth of the two plants.
Explain why tropic movements are important for the survival of plants.