Adrenaline is also known as ‘fight or flight’ hormone. It prepares the body for emergency situations. Increased secretion of adrenaline in the blood increases the blood supply to limbs and to the facial area. It increases the heart rate and breathing rate so that more oxygen could be supplied to theRead more
Adrenaline is also known as ‘fight or flight’ hormone. It prepares the body for emergency situations. Increased secretion of adrenaline in the blood increases the blood supply to limbs and to the facial area. It increases the heart rate and breathing rate so that more oxygen could be supplied to the limbs. Slight precipitation also occurs on the temple and in palms. All of this shows readiness for a fight or; if need be; a flight from the scene.
Iodine is an important constituent of the hormone thyroxine. Iodine deficiency leads to a disease called goiter. Iodised salt is advised to prevent chances of goitre.
Iodine is an important constituent of the hormone thyroxine. Iodine deficiency leads to a disease called goiter. Iodised salt is advised to prevent chances of goitre.
Chemical coordination in animals takes place through hormones. There are several endocrine glands which secrete various kinds of hormones. These hormones regulate different functions in the body. For example; insulin is a hormone which regulates the blood sugar level.
Chemical coordination in animals takes place through hormones. There are several endocrine glands which secrete various kinds of hormones. These hormones regulate different functions in the body. For example; insulin is a hormone which regulates the blood sugar level.
Following things are required for this experiment: Seeds of bean, a deep tray, sand, a porous flower pot Procedure: (i) The tray should be big enough to accommodate the porous pot. (ii) Fill the tray with sand and insert some seeds in it. (iii) Make a pit in the sand and insert the porous potRead more
Following things are required for this experiment:
Seeds of bean, a deep tray, sand, a porous flower pot
Procedure:
(i) The tray should be big enough to accommodate the porous pot.
(ii) Fill the tray with sand and insert some seeds in it.
(iii) Make a pit in the sand and insert the porous pot in it.
(iv) Fill the porous pot with water.
(v) Leave the set up for about a week.
Observation: After a week when seeds are taken out, it is observed that roots grow in the direction of the porous pot. This shows hydrotropic movement in roots.
Auxin increase in concentration in the part of the tendril which is away from the support. This results in increased cell division in that part. The part which is nearer to the support has lesser rate of cell division. As a result, the external part of the tendril grows more than the internal part aRead more
Auxin increase in concentration in the part of the tendril which is away from the support. This results in increased cell division in that part. The part which is nearer to the support has lesser rate of cell division. As a result, the external part of the tendril grows more than the internal part and the tendril coils around the support.
The movement of leaves of the sensitive plant is a nastic movement, i.e. it does not depend on the direction of the stimulus. On the other hand, the movement of a shoot towards light is a tropic movement, i.e. it depends on the direction from which light is coming.
The movement of leaves of the sensitive plant is a nastic movement, i.e. it does not depend on the direction of the stimulus. On the other hand, the movement of a shoot towards light is a tropic movement, i.e. it depends on the direction from which light is coming.
The olfactory receptors; present in the nostrils; pick the smell. They send signals to the brain. The brain interprets those signals and we detect the smell of an incense stick.
The olfactory receptors; present in the nostrils; pick the smell. They send signals to the brain. The brain interprets those signals and we detect the smell of an incense stick.
How does our body respond when adrenaline is secreted into the blood?
Adrenaline is also known as ‘fight or flight’ hormone. It prepares the body for emergency situations. Increased secretion of adrenaline in the blood increases the blood supply to limbs and to the facial area. It increases the heart rate and breathing rate so that more oxygen could be supplied to theRead more
Adrenaline is also known as ‘fight or flight’ hormone. It prepares the body for emergency situations. Increased secretion of adrenaline in the blood increases the blood supply to limbs and to the facial area. It increases the heart rate and breathing rate so that more oxygen could be supplied to the limbs. Slight precipitation also occurs on the temple and in palms. All of this shows readiness for a fight or; if need be; a flight from the scene.
See lessWhy is the use of iodised salt advisable?
Iodine is an important constituent of the hormone thyroxine. Iodine deficiency leads to a disease called goiter. Iodised salt is advised to prevent chances of goitre.
Iodine is an important constituent of the hormone thyroxine. Iodine deficiency leads to a disease called goiter. Iodised salt is advised to prevent chances of goitre.
See lessHow does chemical coordination take place in animals?
Chemical coordination in animals takes place through hormones. There are several endocrine glands which secrete various kinds of hormones. These hormones regulate different functions in the body. For example; insulin is a hormone which regulates the blood sugar level.
Chemical coordination in animals takes place through hormones. There are several endocrine glands which secrete various kinds of hormones. These hormones regulate different functions in the body. For example; insulin is a hormone which regulates the blood sugar level.
See lessDesign an experiment to demonstrate hydrotropism.
Following things are required for this experiment: Seeds of bean, a deep tray, sand, a porous flower pot Procedure: (i) The tray should be big enough to accommodate the porous pot. (ii) Fill the tray with sand and insert some seeds in it. (iii) Make a pit in the sand and insert the porous potRead more
Following things are required for this experiment:
Seeds of bean, a deep tray, sand, a porous flower pot
Procedure:
(i) The tray should be big enough to accommodate the porous pot.
(ii) Fill the tray with sand and insert some seeds in it.
(iii) Make a pit in the sand and insert the porous pot in it.
(iv) Fill the porous pot with water.
(v) Leave the set up for about a week.
Observation: After a week when seeds are taken out, it is observed that roots grow in the direction of the porous pot. This shows hydrotropic movement in roots.
See lessHow do auxins promote the growth of a tendril around a support?
Auxin increase in concentration in the part of the tendril which is away from the support. This results in increased cell division in that part. The part which is nearer to the support has lesser rate of cell division. As a result, the external part of the tendril grows more than the internal part aRead more
Auxin increase in concentration in the part of the tendril which is away from the support. This results in increased cell division in that part. The part which is nearer to the support has lesser rate of cell division. As a result, the external part of the tendril grows more than the internal part and the tendril coils around the support.
See lessGive an example of a plant hormone that promotes growth.
Auxin
Auxin
See lessHow is the movement of leaves of the sensitive plant different from the movement of a shoot towards light?
The movement of leaves of the sensitive plant is a nastic movement, i.e. it does not depend on the direction of the stimulus. On the other hand, the movement of a shoot towards light is a tropic movement, i.e. it depends on the direction from which light is coming.
The movement of leaves of the sensitive plant is a nastic movement, i.e. it does not depend on the direction of the stimulus. On the other hand, the movement of a shoot towards light is a tropic movement, i.e. it depends on the direction from which light is coming.
See lessWhat are plant hormones? Name a plant hormone that promotes growth in plants.
Plant hormones are special chemicals which regulate the growth of various plant parts.
Plant hormones are special chemicals which regulate the growth of various plant parts.
See lessWhat is the role of the brain in reflex action?
Brain has no direct involvement in reflex action. Reflex action is mainly controlled at the level of spinal cord.
Brain has no direct involvement in reflex action. Reflex action is mainly controlled at the level of spinal cord.
See lessHow do we detect the smell of an agarbatti (incense stick)?
The olfactory receptors; present in the nostrils; pick the smell. They send signals to the brain. The brain interprets those signals and we detect the smell of an incense stick.
The olfactory receptors; present in the nostrils; pick the smell. They send signals to the brain. The brain interprets those signals and we detect the smell of an incense stick.
See less