The direction of magnetic field lines is always from the north pole to the south pole. If the field lines would cross each other then the direction of field line would change at the point of crossing which is practically impossible. Hence, two magnetic field lines never intersect each other.
The direction of magnetic field lines is always from the north pole to the south pole. If the field lines would cross each other then the direction of field line would change at the point of crossing which is practically impossible. Hence, two magnetic field lines never intersect each other.
Properties of magnetic field lines: (a) Magnetic field lines follow the direction from the north pole to the south pole. (b) Magnetic field lines always show concentric pattern. (c) Magnetic field lines do not cross one another. (d) Closer the field lines; stronger is the magnetic field and vice-verRead more
Properties of magnetic field lines:
(a) Magnetic field lines follow the direction from the north pole to the south pole.
(b) Magnetic field lines always show concentric pattern.
(c) Magnetic field lines do not cross one another.
(d) Closer the field lines; stronger is the magnetic field and vice-versa is also true.
(e) Magnetic field lines are closer near the poles; which shows greater strength of magnetic field near the poles.
The needle of a compass is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected.
The needle of a compass is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected.
Alveoli 1. Alveoli are functional unit of lungs. 2. A mature lung has about 30 crore alveoli. 3. Alveoli provide a wide surface for gaseous exchange. 4. The exchange of O2 and CO2 takes place through the network of capillaries in alveoli. Nephron 1. Nephrons are functional unit of kidney. 2. A kidneRead more
Alveoli
1. Alveoli are functional unit of lungs.
2. A mature lung has about 30 crore alveoli.
3. Alveoli provide a wide surface for gaseous exchange.
4. The exchange of O2 and CO2 takes place through the network of capillaries in alveoli.
Nephron
1. Nephrons are functional unit of kidney.
2. A kidney has about 10 lakh nephrons.
3. The surface area of a nephron is not much more.
4. The Bowman’s capsule in nephron regulates the concentration of water and salts.
Xylem 1. Xylem conducts water and dissolved minerals from roots to leaves and other parts. 2. In xylem, the transport of material takes place through vessels and tracheids which are dead tissues. 3. In xylem upward movement of water and dissolved minerals is mainly achieved by transpiration pull. IRead more
Xylem
1. Xylem conducts water and dissolved minerals from roots to leaves and other parts.
2. In xylem, the transport of material takes place through vessels and tracheids which are dead tissues.
3. In xylem upward movement of water and dissolved minerals is mainly achieved by transpiration pull. It is caused due to suction created by evaporation of water molecules from the cells of a leaf.
Phloem
1. Phloem conducts prepared food material from leaves to other parts of plant in dissolved form.
2. In phloem, transport of material takes place through sieve tubes with the help of companion cells, which are living cells.
3. In translocation, material is transferred into phloem tissue using energy from ATP. This increases the osmotic pressure that moves the material in the phloem to tissues which have less pressure.
In our heart blood enters twice and also pumped out twice from the heart. The deoxygenated blood from the body is brought to the right atrium through vena cava from where it is sent to right ventricle. From right ventricle, the blood is pumped to the lungs for oxygenation through pulmonary artery. TRead more
In our heart blood enters twice and also pumped out twice from the heart. The deoxygenated blood from the body is brought to the right atrium through vena cava from where it is sent to right ventricle. From right ventricle, the blood is pumped to the lungs for oxygenation through pulmonary artery. The oxygenated blood from lungs again enters the left atrium of the heart through pulmonary veins. From left atrium it is send to left ventricle, from where this oxygenated blood is pumped to different parts of body through the arteries. In this way the blood flows through the heart twice, that’s why it is called ‘double circulation’.
Necessity of double circulation: The right side and the left side of the human heart are useful to keep deoxygenated and oxygenated blood from mixing. This type of separation of oxygenated and deoxygenated blood ensures a highly efficient supply of oxygen to the body. This is useful in case of humans who constantly need energy to maintain their body temperature.
Blood has components- Red blood corpuscles, White blood corpuscles, platelets and Plasma. Red blood cells are the most abundant cells in the human body and they contain an oxygen- carrying pigment, the haemoglobin, in their cytoplasm. Haemoglobin is a conjugated protein, consists of globin and contaRead more
Blood has components- Red blood corpuscles, White blood corpuscles, platelets and Plasma. Red blood cells are the most abundant cells in the human body and they contain an oxygen- carrying pigment, the haemoglobin, in their cytoplasm. Haemoglobin is a conjugated protein, consists of globin and contains a non- protein group called heme; hence the name haemoglobin is given. Due to high partial pressure of the oxygen in the lungs, haemoglobin takes up the oxygen molecules and changes up into the bright red colour of the pigment, called Oxyhaemoglobin; and transport oxygen to the blood cells.
The deficiency of haemoglobin in our body affects the oxygen uptake capacity of blood and this can lead to the deficiency of oxygen in the cells. By this deficiency, it leads to the disease anemia. Anemia can be caused by many reasons including loss of oxygen, loss of blood, destruction of red blood cells or failure in formation of blood etc.
Exchange of the gases takes place in the alveoli. They have a balloon- like or pouch like structure which provides the maximum area for the exchange of gases. Alveoli are the tiny air sacs made up of squamous epithelium, which are present in the lungs and are thin walled, network of blood vessels arRead more
Exchange of the gases takes place in the alveoli. They have a balloon- like or pouch like structure which provides the maximum area for the exchange of gases. Alveoli are the tiny air sacs made up of squamous epithelium, which are present in the lungs and are thin walled, network of blood vessels are present for the exchange of gases. Numerous alveoli in the lungs show the maximum area for the exchange of gases between the air in the alveoli and into the blood in their surrounding capillaries and diffusion of oxygen occurs through this way. And, the diffusion of carbon dioxide occurs from the blood through the thin walls into the alveoli.
Aerobic respiration In most of the plants and the animals, respiration occurs by the use of molecular oxygen and release of carbon dioxide, this phenomena is known as aerobic respiration. The organisms which carry aerobic respiration are known as aerobes. Gases are exchanged in this type of respiratRead more
Aerobic respiration
In most of the plants and the animals, respiration occurs by the use of molecular oxygen and release of carbon dioxide, this phenomena is known as aerobic respiration.
The organisms which carry aerobic respiration are known as aerobes.
Gases are exchanged in this type of respiration.
And, their metabolism occurs in cytoplasm or mitochondria.
Glucose gets broken down into the carbon dioxide, water and energy is released in the form of ATP. It yields more energy available in glucose.
Examples:- all higher organisms like mammals and plants, sponges, flatworms, roundworms etc. have this type of respiration.
Anaerobic respiration
n some organisms, respiration occurs without the use of molecular oxygen and it may or may not involve the production of carbon dioxide, this phenomena is known as anaerobic respiration.
The organisms which carry anaerobic respiration are known as anaerobes.
Gases are not exchanged in this type of respiration.
Their metabolism occurs in only cytoplasm.
In this glucose breaks down into ethyl alcohol and carbon dioxide without using oxygen, also known as alcoholic fermentation and lactic acid fermentation. And it yields only 5% energy available in glucose.
Alcoholic fermentation or yeast oxidization:-
Examples:- lower organisms like bacteria and yeast have this type of respiration. In bacteria, glucose breaks down into lactic acid and energy without the use of oxygen and without the production of carbon dioxide.
Necessary conditions for autotrophic nutrition : (i) Presence of chlorophyll in the living cells. (if) Provision of supply of water to green plants or cells of the plant. (iii) Sufficient sunlight. (iv) Sufficient supply of carbon dioxide. By-product of auto tropic nutrition is oxygen
Necessary conditions for autotrophic nutrition :
(i) Presence of chlorophyll in the living cells.
(if) Provision of supply of water to green plants or cells of the plant.
(iii) Sufficient sunlight.
(iv) Sufficient supply of carbon dioxide.
By-product of auto tropic nutrition is oxygen
Why don’t two magnetic field lines intersect each other?
The direction of magnetic field lines is always from the north pole to the south pole. If the field lines would cross each other then the direction of field line would change at the point of crossing which is practically impossible. Hence, two magnetic field lines never intersect each other.
The direction of magnetic field lines is always from the north pole to the south pole. If the field lines would cross each other then the direction of field line would change at the point of crossing which is practically impossible. Hence, two magnetic field lines never intersect each other.
See lessList the properties of magnetic field lines.
Properties of magnetic field lines: (a) Magnetic field lines follow the direction from the north pole to the south pole. (b) Magnetic field lines always show concentric pattern. (c) Magnetic field lines do not cross one another. (d) Closer the field lines; stronger is the magnetic field and vice-verRead more
Properties of magnetic field lines:
See less(a) Magnetic field lines follow the direction from the north pole to the south pole.
(b) Magnetic field lines always show concentric pattern.
(c) Magnetic field lines do not cross one another.
(d) Closer the field lines; stronger is the magnetic field and vice-versa is also true.
(e) Magnetic field lines are closer near the poles; which shows greater strength of magnetic field near the poles.
Why does a compass needle get deflected when brought near a bar magnet?
The needle of a compass is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected.
The needle of a compass is a small magnet. That’s why when a compass needle is brought near a bar magnet, its magnetic field lines interact with that of the bar magnet. Hence, a compass needle gets deflected.
See lessCompare the functioning of alveoli in the lungs and nephrons in the kidneys with respect to their structure and functioning.
Alveoli 1. Alveoli are functional unit of lungs. 2. A mature lung has about 30 crore alveoli. 3. Alveoli provide a wide surface for gaseous exchange. 4. The exchange of O2 and CO2 takes place through the network of capillaries in alveoli. Nephron 1. Nephrons are functional unit of kidney. 2. A kidneRead more
Alveoli
1. Alveoli are functional unit of lungs.
2. A mature lung has about 30 crore alveoli.
3. Alveoli provide a wide surface for gaseous exchange.
4. The exchange of O2 and CO2 takes place through the network of capillaries in alveoli.
Nephron
1. Nephrons are functional unit of kidney.
2. A kidney has about 10 lakh nephrons.
3. The surface area of a nephron is not much more.
4. The Bowman’s capsule in nephron regulates the concentration of water and salts.
See lessWhat are the differences between the transport of materials in xylem and phloem?
Xylem 1. Xylem conducts water and dissolved minerals from roots to leaves and other parts. 2. In xylem, the transport of material takes place through vessels and tracheids which are dead tissues. 3. In xylem upward movement of water and dissolved minerals is mainly achieved by transpiration pull. IRead more
Xylem
1. Xylem conducts water and dissolved minerals from roots to leaves and other parts.
2. In xylem, the transport of material takes place through vessels and tracheids which are dead tissues.
3. In xylem upward movement of water and dissolved minerals is mainly achieved by transpiration pull. It is caused due to suction created by evaporation of water molecules from the cells of a leaf.
Phloem
1. Phloem conducts prepared food material from leaves to other parts of plant in dissolved form.
2. In phloem, transport of material takes place through sieve tubes with the help of companion cells, which are living cells.
3. In translocation, material is transferred into phloem tissue using energy from ATP. This increases the osmotic pressure that moves the material in the phloem to tissues which have less pressure.
See lessDescribe double circulation of blood in human beings. Why is it necessary?
In our heart blood enters twice and also pumped out twice from the heart. The deoxygenated blood from the body is brought to the right atrium through vena cava from where it is sent to right ventricle. From right ventricle, the blood is pumped to the lungs for oxygenation through pulmonary artery. TRead more
In our heart blood enters twice and also pumped out twice from the heart. The deoxygenated blood from the body is brought to the right atrium through vena cava from where it is sent to right ventricle. From right ventricle, the blood is pumped to the lungs for oxygenation through pulmonary artery. The oxygenated blood from lungs again enters the left atrium of the heart through pulmonary veins. From left atrium it is send to left ventricle, from where this oxygenated blood is pumped to different parts of body through the arteries. In this way the blood flows through the heart twice, that’s why it is called ‘double circulation’.
Necessity of double circulation: The right side and the left side of the human heart are useful to keep deoxygenated and oxygenated blood from mixing. This type of separation of oxygenated and deoxygenated blood ensures a highly efficient supply of oxygen to the body. This is useful in case of humans who constantly need energy to maintain their body temperature.
See lessWhat would be the consequences of a deficiency of haemoglobin in our bodies?
Blood has components- Red blood corpuscles, White blood corpuscles, platelets and Plasma. Red blood cells are the most abundant cells in the human body and they contain an oxygen- carrying pigment, the haemoglobin, in their cytoplasm. Haemoglobin is a conjugated protein, consists of globin and contaRead more
Blood has components- Red blood corpuscles, White blood corpuscles, platelets and Plasma. Red blood cells are the most abundant cells in the human body and they contain an oxygen- carrying pigment, the haemoglobin, in their cytoplasm. Haemoglobin is a conjugated protein, consists of globin and contains a non- protein group called heme; hence the name haemoglobin is given. Due to high partial pressure of the oxygen in the lungs, haemoglobin takes up the oxygen molecules and changes up into the bright red colour of the pigment, called Oxyhaemoglobin; and transport oxygen to the blood cells.
The deficiency of haemoglobin in our body affects the oxygen uptake capacity of blood and this can lead to the deficiency of oxygen in the cells. By this deficiency, it leads to the disease anemia. Anemia can be caused by many reasons including loss of oxygen, loss of blood, destruction of red blood cells or failure in formation of blood etc.
See lessHow are the alveoli designed to maximise the exchange of gases?
Exchange of the gases takes place in the alveoli. They have a balloon- like or pouch like structure which provides the maximum area for the exchange of gases. Alveoli are the tiny air sacs made up of squamous epithelium, which are present in the lungs and are thin walled, network of blood vessels arRead more
Exchange of the gases takes place in the alveoli. They have a balloon- like or pouch like structure which provides the maximum area for the exchange of gases. Alveoli are the tiny air sacs made up of squamous epithelium, which are present in the lungs and are thin walled, network of blood vessels are present for the exchange of gases. Numerous alveoli in the lungs show the maximum area for the exchange of gases between the air in the alveoli and into the blood in their surrounding capillaries and diffusion of oxygen occurs through this way. And, the diffusion of carbon dioxide occurs from the blood through the thin walls into the alveoli.
See lessWhat are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
Aerobic respiration In most of the plants and the animals, respiration occurs by the use of molecular oxygen and release of carbon dioxide, this phenomena is known as aerobic respiration. The organisms which carry aerobic respiration are known as aerobes. Gases are exchanged in this type of respiratRead more
Aerobic respiration
Anaerobic respiration
- n some organisms, respiration occurs without the use of molecular oxygen and it may or may not involve the production of carbon dioxide, this phenomena is known as anaerobic respiration.
- The organisms which carry anaerobic respiration are known as anaerobes.
- Gases are not exchanged in this type of respiration.
- Their metabolism occurs in only cytoplasm.
- In this glucose breaks down into ethyl alcohol and carbon dioxide without using oxygen, also known as alcoholic fermentation and lactic acid fermentation. And it yields only 5% energy available in glucose.
- Examples:- lower organisms like bacteria and yeast have this type of respiration. In bacteria, glucose breaks down into lactic acid and energy without the use of oxygen and without the production of carbon dioxide.
See lessAlcoholic fermentation or yeast oxidization:-
What are the necessary conditions for autotrophic nutrition and what are its by products?
Necessary conditions for autotrophic nutrition : (i) Presence of chlorophyll in the living cells. (if) Provision of supply of water to green plants or cells of the plant. (iii) Sufficient sunlight. (iv) Sufficient supply of carbon dioxide. By-product of auto tropic nutrition is oxygen
Necessary conditions for autotrophic nutrition :
See less(i) Presence of chlorophyll in the living cells.
(if) Provision of supply of water to green plants or cells of the plant.
(iii) Sufficient sunlight.
(iv) Sufficient supply of carbon dioxide.
By-product of auto tropic nutrition is oxygen