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Preeti Dabral 2 years, 11 months ago
The heart of fish has two chambers. This means there is no separate circulation for oxygenated and deoxygenated blood. There is separation of two chambers in the atrium of amphibians. This has further evolved for partial separation of ventricle as well in reptiles. Finally in birds there is complete separation of oxygenated and deoxygenated blood circulation due to advent of four chambers in the heart. Mammal heart is the most developed having the most efficient double circulatory system with four chambers and separation of two blood streams.
Posted by Divya. Kumari 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
Blood is considered on a connective tissue because it contains plasma and the form ed elem ents such as RBCs, WBCs (leucocytes), blood platelets etc.
Posted by Divya. Kumari 2 years, 11 months ago
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Mohd Imran 2 years, 11 months ago
Posted by Divya. Kumari 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
The fish heart is called the venous heart because it only receives blood from the veins and pumps it for oxygenation straight to the gills. In the fish heart, blood travels through a single complete circuit once only. Blood flows into the atrium after passing through the fish leaving it poorly oxygenated.
Posted by Divya. Kumari 2 years, 11 months ago
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Preeti Dabral 2 years, 11 months ago
Serum is plasma without the clotting factors. Red blood cells account for approximately 45% of the whole blood, white blood cells and platelets approximately 1%, and serum or plasma accounts for the remainder, approximately 55% of the volume
Posted by Priyansh Star 2 years, 11 months ago
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Sia ? 2 years, 11 months ago
Biofertilizers are living microbes that enhance plant nutrition by either by mobilizing or increasing nutrient availability in soils. Various microbial taxa including beneficial bacteria and fungi are currently used as biofertilizers, as they successfully colonize the rhizosphere, rhizoplane or root interior.
Posted by Divya. Kumari 2 years, 11 months ago
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Phagocytosis is a cellular process for ingesting and eliminating particles larger than 0.5 μm in diameter, including microorganisms, foreign substances, and apoptotic cells. Phagocytosis is found in many types of cells and it is, in consequence an essential process for tissue homeostasis.
Posted by Divya. Kumari 2 years, 11 months ago
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Sia ? 2 years, 11 months ago
Plasma | Serum |
The liquid part of the blood is called plasma which is a solution in water of many compounds. It contains many organic and inorganic substances. In the plasma, digested food, CO2 and excretory products are carried around the body. | It is the blood plasma from which the fibrinogen has been removed. It contains antibodies to overcome the toxic effect of micro-organisms. |
Posted by Md.Karim Ansari 2 years, 11 months ago
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Bacteria in the digestive system break down nutrients, such as complex sugars, into forms the body can use. Non-hazardous bacteria also help prevent diseases by occupying places that the pathogenic, or disease-causing, bacteria want to attach to. Some bacteria protect us from disease by attacking the pathogens.
Posted by Priyanka M. K 2 years, 11 months ago
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The stages of cellular respiration include glycolysis, pyruvate oxidation, the citric acid or Krebs cycle, and oxidative phosphorylation.
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Posted by Dipanshu Dave 2 years, 11 months ago
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Sia ? 2 years, 11 months ago
Features of Plant Kingdom:
- Plants are autotrophic, except for some carnivorous plants. They trap photo energy from sunlight and convert it to chemical energy through photosynthesis. Because of these plants are the main channel for supplying energy in the food chain on earth.
- Reproduction in plants can be by any of the following modes: Vegetative or Asexual, and Sexual Reproduction.
- The plant cell is unique because of the presence of cell wall and large vacuoles. Green parts of plant contain chlorophyll, which helps them in trapping the photo energy.
- Sizes of plants can vary from microscopic to a very large tree. Plants are mainly divided into Algae, Bryophytes, Pteridophytes, Gymnosperms and Angiosperms.
- Lower plants, like algae and bryophytes, have thalloid structure, while higher plants, like gymnosperms and angiosperms, have clearly defined roots and stems.
- In higher plants root gives a means to anchor in the soil and helps the plant in taking minerals and water from the soil. Green leaves on the stem help them in photosynthesis.
- Most of the plant grow as a result of photosynthesis. After photosynthesis, extra food is utilized to facilitate growth.
- Usually in higher plants growth is unlimited and some taller trees can live a life of more than 1000 years.
- Being the main carbon fixation agents, plants are very important for the whole ecology.
- The whole food basket for humans is being filled by the plant kingdom. Even animal products, like milk and poultry, are indirect results of plants carbon fixation.
- Plants supply raw materials for a majority of economic activities. Wood for furniture and building materials come from plants. The whole paper industry is dependent on plant kingdom. Think of a life if there was no paper and you may understand the larger impact on human civilization.
- Angiosperms have special organs, called flower, to bear sexual parts. Flowers are helpful tool in facilitating variations and further evolution of the plant kingdom.
Mannu Dahiya 2 years, 11 months ago
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Mannu Dahiya 2 years, 10 months ago
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