Protozoa are called early animals because like animals they lack cell wall and have holozoic-type heterotrophic nutrition. They have glycogen as the reserve food. They have however, unicellular nature and are without an embryonic stage in their life cycle. Protozoa evolved before the origin and evolRead more
Protozoa are called early animals because like animals they lack cell wall and have holozoic-type heterotrophic nutrition. They have glycogen as the reserve food. They have however, unicellular nature and are without an embryonic stage in their life cycle. Protozoa evolved before the origin and evolution of true animals or metazoa.
Euglena is called plant-animal because it has characteristics of both plants and animals. Like plants, Euglena has chloroplasts with the help of which it performs autotrophic nutrition by photosynthesis. Like animals, it lacks cell wall, possess pellicle, an anterior invagination" flagellum, eye spoRead more
Euglena is called plant-animal because it has characteristics of both plants and animals. Like plants, Euglena has chloroplasts with the help of which it performs autotrophic nutrition by photosynthesis. Like animals, it lacks cell wall, possess pellicle, an anterior invagination” flagellum, eye spot, etc, and capable of obtaining readymade food in dark (heterotrophic).
The criteria (norms) for deciding divisions in plants are different from the criteria for deciding the sub- groups among animals because the basic designs of their body is different. This is mainly due to the fact that plants are autotrophic and often remain fixed to substratum, while animals are heRead more
The criteria (norms) for deciding divisions in plants are different from the criteria for deciding the sub- groups among animals because the basic designs of their body is different. This is mainly due to the fact that plants are autotrophic and often remain fixed to substratum, while animals are heterotrophic and they can move. Thus, the body design of the two groups is based on the need to make their own food in case of plants and to acquire it from external source in case of animals. The other characteristics such as Presence or absence of skeleton, etc., are used to make subgroups among animals.
The major characteristics used to classify animals in Vertebrata are: 1. The kind of exoskeleton or endoskeleton. 2. The kind of respiratory organs. 3. The method of reproduction and giving birth to young ones. On the basis of above mentioned characters the vertebrata is divided into following classRead more
The major characteristics used to classify animals in Vertebrata are: 1. The kind of exoskeleton or endoskeleton. 2. The kind of respiratory organs. 3. The method of reproduction and giving birth to young ones. On the basis of above mentioned characters the vertebrata is divided into following classes.
1 Exoskeleton of scales: Endoskeleton of cartilage or bones; breathing through gills – pisces (fishes).
2. Breathing through gills only in larva ; skin slimy – Amphibia
3. Exoskeleton of scales or scutes ;laying eggs outside the water – Reptilia.
4. Exoskeieton of feathers; lays eggs ; flight possible – Aves (birds).
5. Exoskeleton of hair; external ears, ; give birth to young ones – Mammalia.
The criteria (norms) for deciding divisions in plants are different from the criteria for deciding the sub- groups among animals because the basic designs of their body is different. This is mainly due to the fact that plants are autotrophic and often remain fixed to substratum, while animals are heRead more
The criteria (norms) for deciding divisions in plants are different from the criteria for deciding the sub- groups among animals because the basic designs of their body is different. This is mainly due to the fact that plants are autotrophic and often remain fixed to substratum, while animals are heterotrophic and they can move. Thus, the body design of the two groups is based on the need to make their own food in case of plants and to acquire it from external source in case of animals. The other characteristics such as Presence or absence of skeleton, etc., are used to make subgroups among animals.
Whittaker (1959) has based his scheme of classification of living organisms into five kingdoms (namely Monera, Protista, Fungi, Plantae and Animalia) on following four bases: 1. Complexity of cell structure. There are two broad categories of cell structure: Prokaryotic and Eukaryotic. Thus, two broaRead more
Whittaker (1959) has based his scheme of classification of living organisms into five kingdoms (namely Monera, Protista, Fungi, Plantae and Animalia) on following four bases:
1. Complexity of cell structure. There are two broad categories of cell structure: Prokaryotic and Eukaryotic. Thus, two broad groups can be formed – one having prokaryotic cell structure and the other having eukaryotic cell structure. Presence or absence of cell wall is another important characteristic.
2. Unicellular and multicellular organisms. This characteristic makes a very basic distinction in the body designs of organisms and helps in their broad categorizations.
3. Mode of nutrition. Organisms basically have two types of nutritions – autotrophic (they can manufacture their own food) and heterotrophic (they obtain their food from external environment, i.e., from other organisms). Thus, organisms can be broadly classified into different groups on the basis of their mode of
nutrition.
4. Phylogenetic relationship. Phylogeny is the evolutionary history or ancestry of an organism. It is believed that the simple organisms are primitive and complex organisms are advanced. This, primitive and advance nature of organisms also helps in their classification into broad groups. For example, the Monera are believed to have given rise to Protista, from which the remaining three kingdoms of multicellular organisms have evolved.
The Classification of have the followings advantages: 1. Classification of organisms according to a definite plan facilitates their identification and makes their study convenient. 2. There is a vast number of organisms in this world. It is not possible by the individual human being to know about alRead more
The Classification of have the followings advantages:
1. Classification of organisms according to a definite plan facilitates their identification and makes their study convenient.
2. There is a vast number of organisms in this world. It is not possible by the individual human being to know about all individuals. Thus, the study of a few representatives from each group gives a broad idea of the life as a whole.
3. Classification gives information about the organisms which do not occur in one’s locality.
4. Classification reveals evolution trends by showing gradually increasing complexity of structure in various groups of organisms.
Why are protozoa are called early animals?
Protozoa are called early animals because like animals they lack cell wall and have holozoic-type heterotrophic nutrition. They have glycogen as the reserve food. They have however, unicellular nature and are without an embryonic stage in their life cycle. Protozoa evolved before the origin and evolRead more
Protozoa are called early animals because like animals they lack cell wall and have holozoic-type heterotrophic nutrition. They have glycogen as the reserve food. They have however, unicellular nature and are without an embryonic stage in their life cycle. Protozoa evolved before the origin and evolution of true animals or metazoa.
See lessWhy is Euglena is called plant-animal?
Euglena is called plant-animal because it has characteristics of both plants and animals. Like plants, Euglena has chloroplasts with the help of which it performs autotrophic nutrition by photosynthesis. Like animals, it lacks cell wall, possess pellicle, an anterior invagination" flagellum, eye spoRead more
Euglena is called plant-animal because it has characteristics of both plants and animals. Like plants, Euglena has chloroplasts with the help of which it performs autotrophic nutrition by photosynthesis. Like animals, it lacks cell wall, possess pellicle, an anterior invagination” flagellum, eye spot, etc, and capable of obtaining readymade food in dark (heterotrophic).
See lessGive one example of each (i) Asymmetry, radial symmetry and bilateral symmetry; (ii) Acoelomate, pseudocoelomate and haemocoelomate.
(i) Amoeba,Hydra and Frog. (ii) Platyhelminths (flatworms), Nematodes (round worms) and Arthropods (crab).
(i) Amoeba,Hydra and Frog.
See less(ii) Platyhelminths (flatworms), Nematodes (round worms) and Arthropods (crab).
How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?
The criteria (norms) for deciding divisions in plants are different from the criteria for deciding the sub- groups among animals because the basic designs of their body is different. This is mainly due to the fact that plants are autotrophic and often remain fixed to substratum, while animals are heRead more
The criteria (norms) for deciding divisions in plants are different from the criteria for deciding the sub- groups among animals because the basic designs of their body is different. This is mainly due to the fact that plants are autotrophic and often remain fixed to substratum, while animals are heterotrophic and they can move. Thus, the body design of the two groups is based on the need to make their own food in case of plants and to acquire it from external source in case of animals. The other characteristics such as Presence or absence of skeleton, etc., are used to make subgroups among animals.
See lessExplain how animals in Vertebrata are classified into further subgroups?
The major characteristics used to classify animals in Vertebrata are: 1. The kind of exoskeleton or endoskeleton. 2. The kind of respiratory organs. 3. The method of reproduction and giving birth to young ones. On the basis of above mentioned characters the vertebrata is divided into following classRead more
The major characteristics used to classify animals in Vertebrata are: 1. The kind of exoskeleton or endoskeleton. 2. The kind of respiratory organs. 3. The method of reproduction and giving birth to young ones. On the basis of above mentioned characters the vertebrata is divided into following classes.
See less1 Exoskeleton of scales: Endoskeleton of cartilage or bones; breathing through gills – pisces (fishes).
2. Breathing through gills only in larva ; skin slimy – Amphibia
3. Exoskeleton of scales or scutes ;laying eggs outside the water – Reptilia.
4. Exoskeieton of feathers; lays eggs ; flight possible – Aves (birds).
5. Exoskeleton of hair; external ears, ; give birth to young ones – Mammalia.
How are the criteria for deciding divisions in plants different from the criteria for deciding the subgroups among animals?
The criteria (norms) for deciding divisions in plants are different from the criteria for deciding the sub- groups among animals because the basic designs of their body is different. This is mainly due to the fact that plants are autotrophic and often remain fixed to substratum, while animals are heRead more
The criteria (norms) for deciding divisions in plants are different from the criteria for deciding the sub- groups among animals because the basic designs of their body is different. This is mainly due to the fact that plants are autotrophic and often remain fixed to substratum, while animals are heterotrophic and they can move. Thus, the body design of the two groups is based on the need to make their own food in case of plants and to acquire it from external source in case of animals. The other characteristics such as Presence or absence of skeleton, etc., are used to make subgroups among animals.
See lessExplain the basis for groupings into five kingdoms.
Whittaker (1959) has based his scheme of classification of living organisms into five kingdoms (namely Monera, Protista, Fungi, Plantae and Animalia) on following four bases: 1. Complexity of cell structure. There are two broad categories of cell structure: Prokaryotic and Eukaryotic. Thus, two broaRead more
Whittaker (1959) has based his scheme of classification of living organisms into five kingdoms (namely Monera, Protista, Fungi, Plantae and Animalia) on following four bases:
See less1. Complexity of cell structure. There are two broad categories of cell structure: Prokaryotic and Eukaryotic. Thus, two broad groups can be formed – one having prokaryotic cell structure and the other having eukaryotic cell structure. Presence or absence of cell wall is another important characteristic.
2. Unicellular and multicellular organisms. This characteristic makes a very basic distinction in the body designs of organisms and helps in their broad categorizations.
3. Mode of nutrition. Organisms basically have two types of nutritions – autotrophic (they can manufacture their own food) and heterotrophic (they obtain their food from external environment, i.e., from other organisms). Thus, organisms can be broadly classified into different groups on the basis of their mode of
nutrition.
4. Phylogenetic relationship. Phylogeny is the evolutionary history or ancestry of an organism. It is believed that the simple organisms are primitive and complex organisms are advanced. This, primitive and advance nature of organisms also helps in their classification into broad groups. For example, the Monera are believed to have given rise to Protista, from which the remaining three kingdoms of multicellular organisms have evolved.
What are the advantages of classifying organisms?
The Classification of have the followings advantages: 1. Classification of organisms according to a definite plan facilitates their identification and makes their study convenient. 2. There is a vast number of organisms in this world. It is not possible by the individual human being to know about alRead more
The Classification of have the followings advantages:
See less1. Classification of organisms according to a definite plan facilitates their identification and makes their study convenient.
2. There is a vast number of organisms in this world. It is not possible by the individual human being to know about all individuals. Thus, the study of a few representatives from each group gives a broad idea of the life as a whole.
3. Classification gives information about the organisms which do not occur in one’s locality.
4. Classification reveals evolution trends by showing gradually increasing complexity of structure in various groups of organisms.