Thigmonasty (स्पर्श संवेदना): The movement of leaves of the sensitive plant (Mimosa pudica) in response to touch is called thigmonasty. It is a rapid, non-directional response to physical contact or mechanical stimulation.
- Example: जब आप ‘छुई-मुई’ पौधे को छूते हैं, तो उसके पत्ते तुरंत सिकुड़ जाते हैं। यह थिग्मोनैस्टी है।
Phototropism (प्रकाशानुवर्तन): The movement of a shoot towards light is called phototropism. It is a directional growth response where the plant grows towards the light source. This is due to the uneven distribution of auxins, which cause cells on the shaded side to elongate more than those on the light side.
- Example: जब पौधा प्रकाश की ओर बढ़ता है, तो यह फोटोट्रोपिज्म है, जिसमें ऑक्सिन हार्मोन की भूमिका होती है।
Other Question Answers 🕵️of Control and Coordination Make Notes ✒️
- What is the difference between a reflex action and walking?
- What happens at the synapse between two neurons?
- Which part of the brain maintains posture and equilibrium of the body?
- How do we detect the smell of an agarbatti (incense stick)?
- What is the role of the brain in reflex action?
- What are plant hormones?
- How is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
- Give an example of a plant hormone that promotes growth.
- How do auxins promote the growth of a tendril around a support?
- Design an experiment to demonstrate hydrotropism.
- How does chemical coordination take place in animals?
- Why is the use of iodised salt advisable?
- How does our body respond when adrenaline is secreted into the blood?
- Why are some patients of diabetes treated by giving injections of insulin?
- Which of the following is a plant hormone?
- The gap between two neurons is called a
- The brain is responsible for
- What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
- Draw the structure of a neuron and explain its function.
- How does phototropism occur in plants?
- Which signals will get disrupted in case of a spinal cord injury?
- How does chemical coordination occur in plants?
- What is the need for a system of control and coordination in an organism?
- How are involuntary actions and reflex actions different from each other?
- Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.