The body segmentation first appeared in the phylum, Annelida (annulus meaning little ring). For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
The body segmentation first appeared in the phylum, Annelida (annulus meaning little ring).
The numbers of eggs produced by an oviparous mother will be more than the young ones produced by a viviparous mother. This is because in oviparous animals, the development of young ones takes place outside the mother’s body. Their eggs are more prone to environmental conditions and predators. TherefRead more
The numbers of eggs produced by an oviparous mother will be more than the young ones produced by a viviparous mother. This is because in oviparous animals, the development of young ones takes place outside the mother’s body. Their eggs are more prone to environmental conditions and predators. Therefore, to overcome the loss, more eggs are produced by mothers so that even under harsh environmental conditions, some eggs might be able to survive and produce young ones. On the other hand, in viviparous organisms, the development of young ones takes place in safe conditions inside the body of the mother. They are less exposed to environmental conditions and predators. Therefore, there are more chances of their survival and hence, less number of young ones is produced compared to the number of eggs.
Birds have undergone many structural adaptations to suit their aerial life. Some of these adaptations are as follows. 1.Streamlined body for rapid and smooth movement. 2.Covering of feathers for insulation. 3.Forelimbs modified into wings and hind limbs used for walking, perching, and swimming 4.PreRead more
Birds have undergone many structural adaptations to suit their aerial life. Some of these adaptations are as follows.
1.Streamlined body for rapid and smooth movement.
2.Covering of feathers for insulation.
3.Forelimbs modified into wings and hind limbs used for walking, perching, and swimming
4.Presence of pneumatic bones to reduce weight
5. Presence of additional air sacs to supplement respiration
Gas bladder or air bladder is a gas filled sac present in fishes. It helps in maintaining buoyancy. Thus, it helps fishes to ascend or descend and stay in the water current. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
Gas bladder or air bladder is a gas filled sac present in fishes. It helps in maintaining buoyancy. Thus, it helps fishes to ascend or descend and stay in the water current.
The characteristic features of the phylum, Chordata, include the presence of a notochord and paired pharyngeal gill slits. In sub-phylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. Thus, it can be said that all vertebrates are choRead more
The characteristic features of the phylum, Chordata, include the presence of a notochord and paired pharyngeal gill slits. In sub-phylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. Thus, it can be said that all vertebrates are chordates but all chordates are not vertebrates.
Water vascular system is a characteristic feature of the phylum, Echinodermata. It consists of an array of radiating channels, tube feet, and madreporite. The water vascular system helps in locomotion, food capturing, and respiration. For more answers visit to website: https://www.tiwariacadeRead more
Water vascular system is a characteristic feature of the phylum, Echinodermata. It consists of an array of radiating channels, tube feet, and madreporite. The water vascular system helps in locomotion, food capturing, and respiration.
The phylum, Arthropoda, consists of more than two-thirds of the animal species on earth. The reasons for the success of arthropods are as follows. 1 Jointed legs that allow more mobility on land 2 Hard exoskeleton made of chitin that protects the body 3 The hard exoskeleton also reduces water loss fRead more
The phylum, Arthropoda, consists of more than two-thirds of the animal species on earth. The reasons for the success of arthropods are as follows.
1 Jointed legs that allow more mobility on land
2 Hard exoskeleton made of chitin that protects the body
3 The hard exoskeleton also reduces water loss from the body of arthropods making them more adapted to terrestrial conditions.
Taenia (Tapeworm) and Fasciola (liver fluke) are examples of parasitic platyhelminthes. Peculiar features in parasitic platyhelminthes are as follows. 1 They have dorsiventrally flattened body and bear hooks and suckers to get attached inside the body of the host. 2 Their body is covered with thickRead more
Taenia (Tapeworm) and Fasciola (liver fluke) are examples of parasitic platyhelminthes.
Peculiar features in parasitic platyhelminthes are as follows.
1 They have dorsiventrally flattened body and bear hooks and suckers to get attached inside the body of the host.
2 Their body is covered with thick tegument, which protects them from the action of digestive juices of the host.
3 The tegument also helps in absorbing nutrients from the host’s body.
Direct development:- 1. It is a type of development in which an embryo develops into a mature individual without involving a larval stage. 2. Metamorphosis is absent. 3. It occurs in fishes, reptiles, birds, and mammals. Indirect development- 1. It is a type of development that involves a sexually-iRead more
Direct development:-
1. It is a type of development in which an embryo develops into a mature individual without involving a larval stage.
2. Metamorphosis is absent.
3. It occurs in fishes, reptiles, birds, and mammals.
Indirect development-
1. It is a type of development that involves a sexually-immature larval stage, having different food requirements than adults.
2. Metamorphosis involving development of larva to a sexually mature adult is present.
3. It occurs in most of the invertebrates and amphibians.
Intracellular digestion:- 1. The digestion of food occurs within the cell. 2. Digestive enzymes are secreted by the surrounding cytoplasm into the food vacuole. 3. Digestive products are diffused into the cytoplasm. 4. It is a less efficient method. 5. It occurs in unicellular organisms. ExtracellulRead more
Intracellular digestion:-
1. The digestion of food occurs within the cell.
2. Digestive enzymes are secreted by the surrounding cytoplasm into the food vacuole.
3. Digestive products are diffused into the cytoplasm.
4. It is a less efficient method.
5. It occurs in unicellular organisms.
Extracellular digestion:-
1. The digestion occurs in the cavity of alimentary canal.
2. Digestive enzymes are secreted by special cells into the cavity of alimentary canal.
3. Digestive products diffuse across the intestinal wall into various parts of the body.
4. It is a more efficient method of digestion.
5. It occurs in multicellular organisms.
Segmentation in the body is first observed in which of the following: (a) Platyhelminthes (b) Aschelminthes (c) Annelida (d) Arthropoda
The body segmentation first appeared in the phylum, Annelida (annulus meaning little ring). For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
The body segmentation first appeared in the phylum, Annelida (annulus meaning little ring).
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
Could the number of eggs or young ones produced by an oviparous and viviparous mother be equal? Why?
The numbers of eggs produced by an oviparous mother will be more than the young ones produced by a viviparous mother. This is because in oviparous animals, the development of young ones takes place outside the mother’s body. Their eggs are more prone to environmental conditions and predators. TherefRead more
The numbers of eggs produced by an oviparous mother will be more than the young ones produced by a viviparous mother. This is because in oviparous animals, the development of young ones takes place outside the mother’s body. Their eggs are more prone to environmental conditions and predators. Therefore, to overcome the loss, more eggs are produced by mothers so that even under harsh environmental conditions, some eggs might be able to survive and produce young ones. On the other hand, in viviparous organisms, the development of young ones takes place in safe conditions inside the body of the mother. They are less exposed to environmental conditions and predators. Therefore, there are more chances of their survival and hence, less number of young ones is produced compared to the number of eggs.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
What are the modifications that are observed in birds that help them fly?
Birds have undergone many structural adaptations to suit their aerial life. Some of these adaptations are as follows. 1.Streamlined body for rapid and smooth movement. 2.Covering of feathers for insulation. 3.Forelimbs modified into wings and hind limbs used for walking, perching, and swimming 4.PreRead more
Birds have undergone many structural adaptations to suit their aerial life. Some of these adaptations are as follows.
1.Streamlined body for rapid and smooth movement.
2.Covering of feathers for insulation.
3.Forelimbs modified into wings and hind limbs used for walking, perching, and swimming
4.Presence of pneumatic bones to reduce weight
5. Presence of additional air sacs to supplement respiration
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
How important is the presence of air bladder in Pisces?
Gas bladder or air bladder is a gas filled sac present in fishes. It helps in maintaining buoyancy. Thus, it helps fishes to ascend or descend and stay in the water current. For more answers visit to website: https://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
Gas bladder or air bladder is a gas filled sac present in fishes. It helps in maintaining buoyancy. Thus, it helps fishes to ascend or descend and stay in the water current.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
“All vertebrates are chordates but all chordates are not vertebrates”. Justify the statement.
The characteristic features of the phylum, Chordata, include the presence of a notochord and paired pharyngeal gill slits. In sub-phylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. Thus, it can be said that all vertebrates are choRead more
The characteristic features of the phylum, Chordata, include the presence of a notochord and paired pharyngeal gill slits. In sub-phylum Vertebrata, the notochord present in embryos gets replaced by a cartilaginous or bony vertebral column in adults. Thus, it can be said that all vertebrates are chordates but all chordates are not vertebrates.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
Water vascular system is the characteristic of which group of the following: (a) Porifera (b) Ctenophora (c) Echinodermata (d) Chordata
Water vascular system is a characteristic feature of the phylum, Echinodermata. It consists of an array of radiating channels, tube feet, and madreporite. The water vascular system helps in locomotion, food capturing, and respiration. For more answers visit to website: https://www.tiwariacadeRead more
Water vascular system is a characteristic feature of the phylum, Echinodermata. It consists of an array of radiating channels, tube feet, and madreporite. The water vascular system helps in locomotion, food capturing, and respiration.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
What are the reasons that you can think of for the arthropods to constitute the largest group of the animal kingdom?
The phylum, Arthropoda, consists of more than two-thirds of the animal species on earth. The reasons for the success of arthropods are as follows. 1 Jointed legs that allow more mobility on land 2 Hard exoskeleton made of chitin that protects the body 3 The hard exoskeleton also reduces water loss fRead more
The phylum, Arthropoda, consists of more than two-thirds of the animal species on earth. The reasons for the success of arthropods are as follows.
1 Jointed legs that allow more mobility on land
2 Hard exoskeleton made of chitin that protects the body
3 The hard exoskeleton also reduces water loss from the body of arthropods making them more adapted to terrestrial conditions.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
What are the peculiar features that you find in parasitic platyhelminthes?
Taenia (Tapeworm) and Fasciola (liver fluke) are examples of parasitic platyhelminthes. Peculiar features in parasitic platyhelminthes are as follows. 1 They have dorsiventrally flattened body and bear hooks and suckers to get attached inside the body of the host. 2 Their body is covered with thickRead more
Taenia (Tapeworm) and Fasciola (liver fluke) are examples of parasitic platyhelminthes.
Peculiar features in parasitic platyhelminthes are as follows.
1 They have dorsiventrally flattened body and bear hooks and suckers to get attached inside the body of the host.
2 Their body is covered with thick tegument, which protects them from the action of digestive juices of the host.
3 The tegument also helps in absorbing nutrients from the host’s body.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
What is the difference between direct and indirect development?
Direct development:- 1. It is a type of development in which an embryo develops into a mature individual without involving a larval stage. 2. Metamorphosis is absent. 3. It occurs in fishes, reptiles, birds, and mammals. Indirect development- 1. It is a type of development that involves a sexually-iRead more
Direct development:-
1. It is a type of development in which an embryo develops into a mature individual without involving a larval stage.
2. Metamorphosis is absent.
3. It occurs in fishes, reptiles, birds, and mammals.
Indirect development-
1. It is a type of development that involves a sexually-immature larval stage, having different food requirements than adults.
2. Metamorphosis involving development of larva to a sexually mature adult is present.
3. It occurs in most of the invertebrates and amphibians.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/
Distinguish between intracellular and extracellular digestion?
Intracellular digestion:- 1. The digestion of food occurs within the cell. 2. Digestive enzymes are secreted by the surrounding cytoplasm into the food vacuole. 3. Digestive products are diffused into the cytoplasm. 4. It is a less efficient method. 5. It occurs in unicellular organisms. ExtracellulRead more
Intracellular digestion:-
1. The digestion of food occurs within the cell.
2. Digestive enzymes are secreted by the surrounding cytoplasm into the food vacuole.
3. Digestive products are diffused into the cytoplasm.
4. It is a less efficient method.
5. It occurs in unicellular organisms.
Extracellular digestion:-
1. The digestion occurs in the cavity of alimentary canal.
2. Digestive enzymes are secreted by special cells into the cavity of alimentary canal.
3. Digestive products diffuse across the intestinal wall into various parts of the body.
4. It is a more efficient method of digestion.
5. It occurs in multicellular organisms.
For more answers visit to website:
See lesshttps://www.tiwariacademy.com/ncert-solutions/class-11/biology/chapter-4/