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Posted by Dilruba Sk 5 years ago
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Yogita Ingle 4 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.
Posted by Rehan Shekh 5 years ago
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Meghna Thapar 4 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.
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Yogita Ingle 5 years ago
The chromatids are moved towards the pole at a speed of 1 mm/minute. About 30 ATP molecules are used to move one chromosome from equator to pole.
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Yogita Ingle 5 years ago
Modifications of stem
- For storage of food- Underground stems of potato, ginger, turmeric, zaminkand, Colocasia are modified to store food in them.
- For support- Tendrils which develop from axillary buds, are slender and spirally coiled and help plants to climb. Example- gourds
- For protection- Axillary buds of stems may also get modified into woody, straight and pointed thorns, which protect plants from browsing animals. Example- Citrus
- For photosynthesis- Some plants of arid regions modify their stems into flattened or fleshy cylindrical structures, which contain chlorophyll and carry out photosynthesis. Example-
- For spread and vegetative propagation-
- Underground stems of some plants spread to new niches and when older parts die new plants are formed. Example- grass and strawberry.
- In some plants, a slender lateral branch arises from the base of the main axis and after growing aerially for some time arch downwards to touch the ground. Example- mint and jasmine
- A lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots is found in aquatic plants. Example- Pistia
- The lateral branches originate from the basal and underground portion of the main stem, grow horizontally beneath the soil and then come out obliquely upward giving rise to leafy shoots. Example- banana, pineapple.
Posted by Shanthamurthy Shanthamurthy 5 years ago
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Meghna Thapar 4 years, 3 months ago
Biological macromolecules are important cellular components and perform a wide array of functions necessary for the survival and growth of living organisms. The four major classes of biological macromolecules are carbohydrates, lipids, proteins, and nucleic acids. Nucleic acids are the most important macromolecules for the continuity of life. They carry the genetic blueprint of a cell and carry instructions for the functioning of the cell.
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Mehak Gautam 5 years ago
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Mehak Gautam 5 years ago
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Harsh Mishra 5 years ago
<i>Copulation</i> is an even more scientific way of saying "sexual intercourse." You can use this word to describe the sexual practices of both humans and animals. Zoologists need to make sure there is copulation among endangered animals such as pandas. Stray animals like cats engage in a lot of copulation, which is why there are so many cats. If your female dog is not fixed and copulates at the park, you might have puppies on the way soon.That's all.
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Meghna Thapar 4 years, 3 months ago
The Gram stain involves staining bacteria, fixing the color with a mordant, decolorizing the cells, and applying a counterstain. Both gram-positive and gram-negative cells have peptidoglycan in their cell walls, so initially, all bacteria stain violet. Gram staining involves three processes: staining with a water-soluble dye called crystal violet, decolorization, and counterstaining, usually with safanin. Due to differences in the thickness of a peptidoglycan layer in the cell membrane between Gram positive and Gram negative bacteria, Gram positive bacteria (with a thicker peptidoglycan layer) retain crystal violet stain during the decolorization process, while Gram negative bacteria lose the crystal violet stain and are instead stained by the safranin in the final staining process.
Posted by Ayush Jain Nkps Rajawas 5 years ago
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Muskann Tiwari 5 years ago
Muskann Tiwari 5 years ago
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Ayush Jain Nkps Rajawas 5 years ago
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Ayush Jain Nkps Rajawas 5 years ago
Unique Girl.. ? 5 years ago
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Yogita Ingle 4 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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