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Yogita Ingle 5 years, 10 months ago
Metagenesis is the phenomenon in which one generation of certain plants and animals reproduce asexually, followed by the sexually reproducing generation. Both the forms are diploid in metagenesis hence, it is the false alternation of generation. Coelenterates exhibits metagenesis (e.g., Obelia) where polyp form alternates with medusa in its life cycle.
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Mehak Gautam 6 years ago
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Yogita Ingle 5 years, 10 months ago
Meristem : A meristem or meristematic tissues is a group of cells that are in a continuous state of division and thus continuously produce new cells. Location and function of meristems : On the basis of location and function, the meristems are of the following types:
(1) Apical meristems : These are present at the apices of stems, roots and branches. The activity of the apices of stems, adds to the length of the plant or its part.
(2) Intercalary meristems : These meristems are intercalated in between the permanent tissues. They may be present either at the base of the internode as in the stem of various grasses and wheat; or at the base of the leaf as in pinus; or at the base of a node as in mint. The activities of these meristems also add to the length of the plant or its organs.
(3) Lateral meristems : These meristems are present along the side of the stem. These include cambium and cork cambium. The activity of lateral meristems adds to the thickness of the plant. A meristem or meristematic tissues is a group of cells that are in a continuous state of division and thus continuously produce new cells. Location and function of meristems : On the basis of location and function, the meristems are of the following types:
(1) Apical meristems : These are present at the apices of stems, roots and branches. The activity of the apices of stems, adds to the length of the plant or its part.
(2) Intercalary meristems : These meristems are intercalated in between the permanent tissues. They may be present either at the base of the internode as in the stem of various grasses and wheat; or at the base of the leaf as in pinus; or at the base of a node as in mint. The activities of these meristems also add to the length of the plant or its organs.
(3) Lateral meristems : These meristems are present along the side of the stem. These include cambium and cork cambium. The activity of lateral meristems adds to the thickness of the plant.
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Sachin Tiwari 6 years ago
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Saima R. 6 years ago
Saima R. 6 years ago
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Saima R. 6 years ago
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Saima R. 6 years ago
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Meghna Thapar 5 years, 2 months ago
A mammary gland is an exocrine gland in humans and other mammals that produces milk to feed young offspring. Mammals get their name from the Latin word mamma, "breast". In a few mammalian species, male lactation can occur. Functionally, the mammary glands produce milk; structurally, they are modified sweat glands. Mammary glands, which are located in the breast overlying the pectoralis major muscles, are present in both sexes, but usually are functional only in the female.
Posted by Kanishka Raghuwanshi 6 years ago
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Isfaqul Hussain 6 years ago
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Yogita Ingle 6 years ago
Aliphatic Compounds
A major class of organic compounds that includes all those with carbon atoms linked in straight or branched open chains. Aliphatic compounds include alkanes,alkenes, or alkynes, or their derivatives.
Example ----alkane, alkene, alkyne, alkadiene, haloalkanes, etc.
Alicyclic Compounds
An organic compound in which carbon atoms are linked to form one or more rings. Aromatic compounds are excluded because of their special properties. In general, alicyclic compounds resemble analogous aliphatic compounds.
Example-------Cyclohexan (C6H12) is alicyclic, as are manyterpenes, such as menthol.
Posted by Netik Verma 6 years ago
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Posted by Netik Verma 6 years ago
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Sia ? 6 years ago
Triangle law of vector addition states that when two vectors are represented by two sides of a triangle in magnitude and direction taken in same order then third side of that triangle represents in magnitude and direction the resultant of the vectors.
Chandan Kumar 6 years ago
Posted by Netik Verma 6 years ago
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