Examples of plants growth hormones: • Gibberellins help in the growth of the stem. • Auxins help in the growth of the stem. • Cytokinins promote cell division. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-7/
Examples of plants growth hormones:
• Gibberellins help in the growth of the stem.
• Auxins help in the growth of the stem.
• Cytokinins promote cell division.
Plant hormones or phytohormones arenaturally-occurring organic substances. These are synthesized in one part of the plant body (in minute quantities) and are translocated to other parts when required. The five major types of phytohormones are auxins, gibberellins, cytokinins, abscisic acid and ethylRead more
Plant hormones or phytohormones arenaturally-occurring organic substances. These are synthesized in one part of the plant body (in minute quantities) and are translocated to other parts when required. The five major types of phytohormones are auxins, gibberellins, cytokinins, abscisic acid and ethylene.
• Gibberellins help in the growth of the stem.
• Auxins help in the growth of the stem.
• Cytokinins promote cell division.
• Abscisic acid is one example of a hormone which inhibits growth.
Reflex actions are sudden responses, which do not involve any thinking. For example, when we touch a hot object, we withdraw our hand immediately without thinking as thinking may take time which would be enough to get us burnt. The sensory nerves that detect the heat are connected to the nerves thatRead more
Reflex actions are sudden responses, which do not involve any thinking. For example, when we touch a hot object, we withdraw our hand immediately without thinking as thinking may take time which would be enough to get us burnt. The sensory nerves that detect the heat are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to it quickly (output) is called a reflex arc. The reflex arcs –connections present between the input and output nerves − meet in a bundle in the spinal cord.
Reflex arcs are formed in the spinal cord and the information (input) reaches the brain. The brain is only aware of the signal and the response that has taken place. However, the brain has no role to play in the creation of the response.
A very small gap that occurs between the last portion of axon of one neuron and the dendrite of the other neuron is known as a synapse. It acts as a one way valve to transmit impulses in one direction only. This one-directional transfer of impulses occurs as the chemicals are produced in only one siRead more
A very small gap that occurs between the last portion of axon of one neuron and the dendrite of the other neuron is known as a synapse. It acts as a one way valve to transmit impulses in one direction only.
This one-directional transfer of impulses occurs as the chemicals are produced in only one side of the neuron i.e., the axon’s side. From axon, the impulses travel across the synapse to the dendrite of the other neuron.
Nervous system mechanism: 1. The information is conveyed in the form of electric impulse. 2. The axons and dendrites transmit the information through a coordinated effort. 3. The flow of information is rapid and the response is quick. 4. Its effects are short lived. Hormonal system mechanism: 1. TheRead more
Nervous system mechanism:
1. The information is conveyed in the form of electric impulse.
2. The axons and dendrites transmit the information through a coordinated effort.
3. The flow of information is rapid and the response is quick.
4. Its effects are short lived.
Hormonal system mechanism:
1. The information is conveyed in the form of chemical messengers.
2. The information is transmitted or transported through blood.
3. The information travels slowly and the response is slow.
4. It has prolonged effects.
Receptors are sensory structures (organs/tissues or cells) present all over the body. The receptors are either grouped in case of eye or ear, or scattered in case of skin. Functions of receptors: They sense the external stimuli such as heat or pain. They also trigger an impulse in the sensory neRead more
Receptors are sensory structures (organs/tissues or cells) present all over the body. The receptors are either grouped in case of eye or ear, or scattered in case of skin. Functions of receptors:
They sense the external stimuli such as heat or pain.
They also trigger an impulse in the sensory neuron which sends message to the spinal cord. When the receptors are damaged, the external stimuli transferring signals to the brain are not felt. For example, in the case of damaged receptors, if we accidentally touch any hot object, then our hands might get burnt as damaged receptors cannot perceive the external stimuli of heat and pain.
Give an example of a plant hormone that promotes growth.
Examples of plants growth hormones: • Gibberellins help in the growth of the stem. • Auxins help in the growth of the stem. • Cytokinins promote cell division. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-7/
Examples of plants growth hormones:
• Gibberellins help in the growth of the stem.
• Auxins help in the growth of the stem.
• Cytokinins promote cell division.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-7/
What are plant hormones ?
Plant hormones or phytohormones arenaturally-occurring organic substances. These are synthesized in one part of the plant body (in minute quantities) and are translocated to other parts when required. The five major types of phytohormones are auxins, gibberellins, cytokinins, abscisic acid and ethylRead more
Plant hormones or phytohormones arenaturally-occurring organic substances. These are synthesized in one part of the plant body (in minute quantities) and are translocated to other parts when required. The five major types of phytohormones are auxins, gibberellins, cytokinins, abscisic acid and ethylene.
• Gibberellins help in the growth of the stem.
• Auxins help in the growth of the stem.
• Cytokinins promote cell division.
• Abscisic acid is one example of a hormone which inhibits growth.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-7/
What is the role of the brain in reflex action?
Reflex actions are sudden responses, which do not involve any thinking. For example, when we touch a hot object, we withdraw our hand immediately without thinking as thinking may take time which would be enough to get us burnt. The sensory nerves that detect the heat are connected to the nerves thatRead more
Reflex actions are sudden responses, which do not involve any thinking. For example, when we touch a hot object, we withdraw our hand immediately without thinking as thinking may take time which would be enough to get us burnt. The sensory nerves that detect the heat are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to it quickly (output) is called a reflex arc. The reflex arcs –connections present between the input and output nerves − meet in a bundle in the spinal cord.
Reflex arcs are formed in the spinal cord and the information (input) reaches the brain. The brain is only aware of the signal and the response that has taken place. However, the brain has no role to play in the creation of the response.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-7/
What happens at the synapse between two neurons?
A very small gap that occurs between the last portion of axon of one neuron and the dendrite of the other neuron is known as a synapse. It acts as a one way valve to transmit impulses in one direction only. This one-directional transfer of impulses occurs as the chemicals are produced in only one siRead more
A very small gap that occurs between the last portion of axon of one neuron and the dendrite of the other neuron is known as a synapse. It acts as a one way valve to transmit impulses in one direction only.
This one-directional transfer of impulses occurs as the chemicals are produced in only one side of the neuron i.e., the axon’s side. From axon, the impulses travel across the synapse to the dendrite of the other neuron.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-7/
Compare and contrast nervous and hormonal mechanisms for control and coordination in animals.
Nervous system mechanism: 1. The information is conveyed in the form of electric impulse. 2. The axons and dendrites transmit the information through a coordinated effort. 3. The flow of information is rapid and the response is quick. 4. Its effects are short lived. Hormonal system mechanism: 1. TheRead more
Nervous system mechanism:
1. The information is conveyed in the form of electric impulse.
2. The axons and dendrites transmit the information through a coordinated effort.
3. The flow of information is rapid and the response is quick.
4. Its effects are short lived.
Hormonal system mechanism:
See less1. The information is conveyed in the form of chemical messengers.
2. The information is transmitted or transported through blood.
3. The information travels slowly and the response is slow.
4. It has prolonged effects.
What is the function of receptors in our body? Think of situations where receptors do not work properly. What problems are likely to arise?
Receptors are sensory structures (organs/tissues or cells) present all over the body. The receptors are either grouped in case of eye or ear, or scattered in case of skin. Functions of receptors: They sense the external stimuli such as heat or pain. They also trigger an impulse in the sensory neRead more
Receptors are sensory structures (organs/tissues or cells) present all over the body. The receptors are either grouped in case of eye or ear, or scattered in case of skin. Functions of receptors:
They sense the external stimuli such as heat or pain.
They also trigger an impulse in the sensory neuron which sends message to the spinal cord. When the receptors are damaged, the external stimuli transferring signals to the brain are not felt. For example, in the case of damaged receptors, if we accidentally touch any hot object, then our hands might get burnt as damaged receptors cannot perceive the external stimuli of heat and pain.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-10/science/chapter-7/