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Sia ? 6 years, 6 months ago
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Meghna Thapar 5 years, 6 months ago
Ctenophores are more commonly known as comb jellies. They comprise a group of gelatinous zooplankton found in all the world's seas. The word ctenophora comes from Greek and means literally “comb carriers” and the reason is that they have eight comb rows, which are used for locomotion. Ctenophora are commonly known as comb jellies. They are free-swimming, marine, solitary, pelagic animals. No polymorphism and no attached stages were found. The body is transparent, gelatinous, pear-shaped, cylindrical, or flat or ribbon-shaped.
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Pinku Meena 6 years, 5 months ago
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Sia ? 6 years, 6 months ago
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Ranjeet Kumar 6 years, 6 months ago
Sia ? 6 years, 6 months ago
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Meha Verma 6 years, 6 months ago
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Meghna Thapar 5 years, 4 months ago
- Acoelomate - Flatworms (phyla Platyhelminthes, Nemertea, and Mesozoa) lack a coelom, although nemerteans have a fluid-filled cavity at their anterior, or head, end, which is used to eject the proboscis rapidly. The lack of a fluid-filled cavity adjacent to the muscles reduces the extent to which the muscles can contract and the force they exert. Other examples -<i> Spongilla</i>, sea anemone,<i> Planaria,</i> liver fluke, etc.
- Pseudocoelomate animals have a pseudocoelom (literally “false cavity”), which is a fully functional body cavity. Tissue derived from mesoderm only partly lines the fluid filled body cavity of these animals. Thus, although organs are held in place loosely, they are not as well organized as in a coelomate. Example - <i>Wuchereria, Ascaris.</i>
- Coelomate animals or Coelomata ( "true coelom") have a fluid filled body cavity called a coelom with a complete lining called peritoneum derived from mesoderm. Example - <i>Nereis</i>, Earthworm, Scorpion, Birds, Fishes, Horse.
Posted by Parminder Singh Sidhu 6 years, 6 months ago
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Sia ? 6 years, 6 months ago
Posted by Parminder Singh Sidhu 6 years, 6 months ago
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Sia ? 6 years, 6 months ago
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Posted by Saloni Singh 6 years, 6 months ago
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Sia ? 6 years, 6 months ago
Growth has to do with organisms adapting to new changes in their physiology, such as a child growing into an adult. Reproduction, however, is when a new organism is formed from another in the same species or family.
Yogita Ingle 6 years, 6 months ago
Growth occurs throughout the lifespan but not uniformly. It occurs at a faster rate until a plant or animal attains maturity. After this stage, gradually growth slows down and stops after a particular time.
This entire process and phenomena, where an organism, grows physically, evolves physiologically, attains mental growth and maturity. This is collectively known as Development. The process of development of shape and structure of a living organism is known as Morphogenesis, whereas Differentiation is the process of change in cells, tissues and internal & external organs.
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Mubin Nagari 6 years, 6 months ago
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Abhinav Raghuvanshi 6 years, 6 months ago
Posted by Khanikaa Vijayakumar 6 years, 6 months ago
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Saloni Singh 6 years, 6 months ago
Rajesh Bura 6 years, 6 months ago
Yogita Ingle 6 years, 6 months ago
Coelomate: Coelom is present in a coelomate. Animals belonging to phyla Annelida, Mollusca, Arthropoda, Echinodermata, Hemichordata and Chordata are examples of coelomates.
Posted by Khanikaa Vijayakumar 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
Pseudocoelomate: In pseudocoelomates, mesoderm appears as pouches between endoderm and ectoderm. But the cavity formed is not lined by mesoderm, e.g. Aschelminthes.
Posted by Khanikaa Vijayakumar 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
Acoelomate: Coelom is absent in an acoelomate,e.g. Platyhelminthes.
Posted by Khanikaa Vijayakumar 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
- They are multicellular organisms, exhibiting tissue grade of the organisation.
- They are diploblastic, with two layers of cells, an outer layer called the ectoderm and the inner layer called the endoderm. There is a non-cellular layer that is the mesoglea in between the ectoderm and the endoderm.
- They show radial symmetry.
- They have a single opening in the body through which food is taken in and also waste is expelled out.
- The opening in the body is surrounded by tentacles.
Posted by Khanikaa Vijayakumar 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
i. They have pores all over their body.
ii. The are non motile and attached to some solid support.
iii. Animals of this phylum are known as sponges. They have a characteristic canal system for water passage not found in any other kind of animals.
iv. Their skeleton is made up of calcareous or siliceous spicules or spongin fibres.
v Reproduction is both asexual by budding and gemules and sexual reproduction through fertilization.
vi. Body has very minimum differentiation and division into tissues.
Posted by Khanikaa Vijayakumar 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
|
Intracellular digestion |
Extracellular digestion |
||
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1. |
The digestion of food occurs within the cell. |
1. |
The digestion occurs outside the cell in the cavity of alimentary canal. |
|
2. |
Digestive enzymes are secreted by the surrounding cytoplasm into the food vacuole. |
2. |
Digestive enzymes are secreted by special cells into the cavity of alimentary canal. |
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3. |
Digestive products are diffused into the cytoplasm. |
3. |
Digestive products diffuse across the intestinal wall into various parts of the body. |
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4. |
It is a less efficient method. |
4. |
It is a more efficient method of digestion. |
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5. |
It occurs in unicellular organisms. |
5. |
It occurs in multicellular organisms. |
Posted by Thakur Nobody 6 years, 6 months ago
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Thakur Nobody 6 years, 6 months ago
Posted by Aashish Chouhan 6 years, 6 months ago
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Esha Pal 6 years, 6 months ago
Posted by Raman Sharma 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
Euglenids are one of the best-known groups of flagellates, which are excavate eukaryotes of the phylum Euglenophyta and their cell structure is typical of that group .
Posted by Dhirendra Kumar 6 years, 6 months ago
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Yogita Ingle 6 years, 6 months ago
| Chloroplasts | Chromoplasts |
| They contain mainly chlorophylls and some amount of carotene and xanthophyll. | They contain mainly carotene and xanthophyll. |
| They are present in the mesophyll of leaves. | They are present in the petals of flowers, skin of fruits, etc. |
| Their main role is to prepare food by the process of photosynthesis | They don’t play any role in photosynthesis their main role is to impart colouration to plants. |
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Prakash Mali 6 years, 6 months ago
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