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Posted by Palak Kumari 5 years, 9 months ago
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Yash Raut 5 years, 9 months ago
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- Xylem transports water and minerals from roots to aerial parts of the plant
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It consists of tracheids, vessels, xylem parenchyma and xylem fibres
Palak Kumari 5 years, 9 months ago
Posted by Rakesh Mahajan 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Umbras and penumbras are the names for two kinds of regions in a shadow that have different amounts of light in them. An "umbra" is the part of the shadow where all of the light from the source is blocked by the shadowing object. A "penumbra" is that region around the umbra where the shadow is only partial, or imperfect.
Posted by Abhinav Agashe 5 years, 9 months ago
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Posted by Gajanand Kannade Kannade 5 years, 9 months ago
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Manasvi Joshi 5 years, 9 months ago
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Pollination: The transfer of pollen grains from anthers to stigma is called pollination. Pollination is of two types, viz. self pollination and cross pollination.
Self Pollination: When anthers of the same flower are transferred to the stigma; it is called self pollination.
Cross Pollination: When anthers from a different flower are transferred to the stigma; it is called cross pollination. The flowers can be on the same plant or on different plants. Cross pollination is the norm in most of the plants. Plants need help from various agents of pollination to carry out cross pollination. Wind, insects, birds and other animals play the role of agent of pollination.
Posted by Saswati Jena 5 years, 9 months ago
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Gaurav Seth 5 years, 9 months ago
- The universal indicator is used to know the strength of acid or base.
- Universal indicator is a mixture of several indicators.
- The universal indicator shows different colours at different concentrations of hydrogen ions in a solution.
Posted by Subhashree Chinu 5 years, 9 months ago
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Posted by Shah Tirth 5 years, 9 months ago
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Manasvi Joshi 5 years, 9 months ago
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| Autotrophs | Heterotrophs |
| Autotrophs are organisms that prepare their own food. | Heterotrophs depend upon other organisms for nutrition. |
| These are known as the producers and include green plants, algae and a few photosynthetic bacteria. | These are the consumers and include cows, buffaloes, tigers, horses, etc. |
| These can be classified as photoautotrophs and chemoautotrophs. | These can be classified as photoheterotrophs and chemoheterotrophs. |
| The chloroplast helps in preparing food. | They do not contain chloroplast so cannot prepare food. |
| They obtain energy from inorganic sources by converting light energy into chemical energy. | They obtain energy directly or indirectly from other organisms. |
| Autotrophs can store light energy and chemical energy. | Heterotrophs cannot store energy. |
| They are placed at the primary level in the food chain. | These are placed in secondary or tertiary level in the food chain. |
| These can move from one place to another in search of food and shelter. | They cannot move from their place |
Posted by Shah Tirth 5 years, 9 months ago
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Meghna Thapar 5 years, 9 months ago
A carbohydrate consists of carbon (C), hydrogen (H) and oxygen (O) atoms.
Posted by Shah Tirth 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
The main function of red blood cells is the transport of oxygen from the lungs to the body's cells. It also maintains the shape of the red blood cells and gives a red colour to blood.
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Meet P 5 years, 9 months ago
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Yogita Ingle 5 years, 9 months ago
Nitrogenous fertiliser is not added in soil in which leguminous plants are grown because the nitrogen fixing bacteria reside in the root nodules of the leguminous plants. These bacteria convert atmospheric nitrogen into soluble nitrogenous compounds. Hence the soil in which legumes are grown becomes rich in nitrogen and does not require nitrogenous fertilsers.
Posted by Arjun Dere 5 years, 9 months ago
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Meghna Thapar 5 years, 9 months ago
Working of Human blood circulatory system takes place in the steps below:
(i) When the muscles of all the four chambers are relaxed, the pulmonary vein brings the oxygenated blood from the lungs in the left atrium of the heart.
(ii) When the left atrium contracts, the oxygenated blood is pushed into the left ventricle through valve V1.
(iii) When the left ventricle contracts, the oxygenated blood enters the main artery called aorta from which it goes to the different body organs through small branches called arterioles and capillaries.
(iv) The main artery carries the blood to all the organs of the body head, arms etc except the lungs. The oxygenated blood gives off oxygen, digested food and dissolved materials to the body cells. The carbon dioxide produced in the cells enters the blood. The deoxygenated blood enters main vein called vena cava which carried it to the right atrium of the heart.
(v) When the right atrium contracts, the deoxygenated blood enters right ventricle through valve V2.
(vi) When the right ventricle contracts, the deoxygenated blood enters the lungs through pulmonary artery and releases carbon dioxide and absorbs fresh oxygen from air. The blood becomes oxygenated again and is sent to the left atrium of heart by pulmonary vein for circulation in the body. This whole process is repeated continuously.
Posted by Mohammed Tabarak 5 years, 9 months ago
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The organisms feed upon the dead plant and animal tissues and convert them into dark colored substance called humus.
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Posted by Balkishan Dariwal 5 years, 9 months ago
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Meghna Thapar 5 years, 9 months ago
A simple electromagnet consisting of a coil of insulated wire wrapped around an iron core. A core of ferromagnetic material like iron serves to increase the magnetic field created. The strength of magnetic field generated is proportional to the amount of current through the winding. Take around 75 cm long piece of insulated flexible wire and an iron nail. Wind the wire tightly around the nail in the form of a coil. Connect the free ends of the wire to the terminals of a cell through a switch. Place some pins on or near the end of the nail. Now switch on the current and the pins cling to the tip of the nail. Switch off the current. The coil in the above activity behaves like a magnet when electric current flows through it. When the electric current is switched off, the coil generally loses its magnetism. Such coils are called electromagnets. The electromagnets could be made strong by increasing the number of turns in the coil and by increasing the current passing through the coil.
Posted by Prince Sharma 5 years, 9 months ago
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Posted by Prince Sharma 5 years, 9 months ago
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Meghna Thapar 5 years, 6 months ago
Salt is an ionic compound that has a cation other than H+ and an anion other than OH– and is obtained along with water in the neutralization reaction between acids and bases. Eg:- NaCl, CuCl2 etc. Sodium chloride is one of the best-known salt. In addition to being classified as normal, acid, or basic, salts are categorized as simple salts, double salts, or complex salts. Simple salts, e.g., sodium chloride, contain only one kind of positive ion (other than the hydrogen ion in acid salts).
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Meghna Thapar 5 years, 9 months ago
The largest cells is an egg cell of ostrich. The longest cell is the nerve cell. The largest cell in the human body is female ovum.
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