Components of blood include erythrocytes (RBCs), leucocytes (WBCs), and thrombocytes (platelets). These components form 45% of blood. They are suspended in the remaining fluid portion, called plasma. Mammalian erythrocytes are biconcave, coloured cells devoid of a nucleus. They help in transportingRead more
Components of blood include erythrocytes (RBCs), leucocytes (WBCs), and thrombocytes (platelets). These components form 45% of blood. They are suspended in the remaining fluid portion, called plasma.
Mammalian erythrocytes are biconcave, coloured cells devoid of a nucleus. They help in transporting respiratory gases.
Leucocytes or white blood cells are nucleated cells. They can be divided into two types, granulocytes (neutrophils, eosinophils, and basophils) and agranulocytes (lymphocytes and monocytes). They help fight against various disease-causing germs entering the body.
Thrombocytes are cell fragments produced from megarkaryocytes of the bone. They play a major role during blood coagulation.
(a) Prostomium and peristomium Prostomium:-Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function. Peristomium:-The first body segment in the earthworm is called the peristomium. It surrounds the mouth openingRead more
(a) Prostomium and peristomium
Prostomium:-Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function.
Peristomium:-The first body segment in the earthworm is called the peristomium. It surrounds the mouth opening.
(b) Septal nephridium and pharyngeal nephridium
Septal nephridium:-They are present on both sides of intersegmental septa behind the 15th segment. They open into the intestines.
Pharyngeal nephridium:- They are present as three paired tufts in the fourth, fifth, and sixth segments.
(i) Nephridia are segmentally arranged excretory organs present in earthworms. (ii) On the basis of their location, three types of nephridia are found in earthworms. They are: (i)- Septal nephridia: These are present on both sides of the inter-segmental septa behind the 15th segment. They open intoRead more
(i) Nephridia are segmentally arranged excretory organs present in earthworms.
(ii) On the basis of their location, three types of nephridia are found in earthworms. They are:
(i)- Septal nephridia: These are present on both sides of the inter-segmental septa behind the 15th segment. They open into the intestines.
(ii)- Integumentary nephridia: These lie attached to the body wall from the third segment to the last segment, which opens on the body surface.
(iii)- Pharyngeal nephridia: These are present as three paired tufts in fourth, fifth, and sixth segments.
(i) The common name of Periplaneta americana is the American cockroach. (ii) Four pairs of spermathecae are present in earthworms. They are located between sixth and the ninth segments. They help in receiving and storing the spermatozoa during copulation. (iii) In a cockroach, the pair of ovaries isRead more
(i) The common name of Periplaneta americana is the American cockroach.
(ii) Four pairs of spermathecae are present in earthworms. They are located between sixth and the ninth segments. They help in receiving and storing the spermatozoa during copulation.
(iii) In a cockroach, the pair of ovaries is located between 12th and 13th abdominal segments.
(iv) In both sexes, the abdomen of a cockroach consists of ten segments.
(v) Malphigian tubules are main excretory organs of cockroaches. They form a part of the alimentary canal.
What are the cellular components of blood?
Components of blood include erythrocytes (RBCs), leucocytes (WBCs), and thrombocytes (platelets). These components form 45% of blood. They are suspended in the remaining fluid portion, called plasma. Mammalian erythrocytes are biconcave, coloured cells devoid of a nucleus. They help in transportingRead more
Components of blood include erythrocytes (RBCs), leucocytes (WBCs), and thrombocytes (platelets). These components form 45% of blood. They are suspended in the remaining fluid portion, called plasma.
Mammalian erythrocytes are biconcave, coloured cells devoid of a nucleus. They help in transporting respiratory gases.
Leucocytes or white blood cells are nucleated cells. They can be divided into two types, granulocytes (neutrophils, eosinophils, and basophils) and agranulocytes (lymphocytes and monocytes). They help fight against various disease-causing germs entering the body.
Thrombocytes are cell fragments produced from megarkaryocytes of the bone. They play a major role during blood coagulation.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-7/
Distinguish between the following (a) Prostomium and peristomium (b) Septal nephridium and pharyngeal nephridium
(a) Prostomium and peristomium Prostomium:-Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function. Peristomium:-The first body segment in the earthworm is called the peristomium. It surrounds the mouth openingRead more
(a) Prostomium and peristomium
Prostomium:-Prostomium is a small fleshy lobe, which overhangs the mouth of an earthworm. It helps the organism push into the soil and is sensory in function.
Peristomium:-The first body segment in the earthworm is called the peristomium. It surrounds the mouth opening.
(b) Septal nephridium and pharyngeal nephridium
Septal nephridium:-They are present on both sides of intersegmental septa behind the 15th segment. They open into the intestines.
Pharyngeal nephridium:- They are present as three paired tufts in the fourth, fifth, and sixth segments.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-7/
Answer the following: (i) What is the function of nephridia? (ii) How many types of nephridia are found in earthworm based on their location?
(i) Nephridia are segmentally arranged excretory organs present in earthworms. (ii) On the basis of their location, three types of nephridia are found in earthworms. They are: (i)- Septal nephridia: These are present on both sides of the inter-segmental septa behind the 15th segment. They open intoRead more
(i) Nephridia are segmentally arranged excretory organs present in earthworms.
(ii) On the basis of their location, three types of nephridia are found in earthworms. They are:
(i)- Septal nephridia: These are present on both sides of the inter-segmental septa behind the 15th segment. They open into the intestines.
(ii)- Integumentary nephridia: These lie attached to the body wall from the third segment to the last segment, which opens on the body surface.
(iii)- Pharyngeal nephridia: These are present as three paired tufts in fourth, fifth, and sixth segments.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-7/
Answer in one word or one line. (i) Give the common name of Periplaneta americana. (ii) How many spermathecae are found in earthworm? (iii) What is the position of ovaries in the cockroach? (iv) How many segments are present in the abdomen of cockroach? (v) Where do you find malphigian tubules?
(i) The common name of Periplaneta americana is the American cockroach. (ii) Four pairs of spermathecae are present in earthworms. They are located between sixth and the ninth segments. They help in receiving and storing the spermatozoa during copulation. (iii) In a cockroach, the pair of ovaries isRead more
(i) The common name of Periplaneta americana is the American cockroach.
(ii) Four pairs of spermathecae are present in earthworms. They are located between sixth and the ninth segments. They help in receiving and storing the spermatozoa during copulation.
(iii) In a cockroach, the pair of ovaries is located between 12th and 13th abdominal segments.
(iv) In both sexes, the abdomen of a cockroach consists of ten segments.
(v) Malphigian tubules are main excretory organs of cockroaches. They form a part of the alimentary canal.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-7/