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Ask QuestionPosted by Dheeraj Jandu 5 years ago
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Yogita Ingle 5 years ago
(a) Construction purposes: Many conifers such as pine, cedar, etc., are sources of the soft wood used in construction and packing.
(b) Medicinal uses: An anticancer drug Taxol is obtained from Taxus. Many species of Ephedra produce ephedrine, which can be used in the treatment of asthma and bronchitis.
(c) Food source: The seeds of Pinus gerardiana (known as chilgoza) are edible.
(d) Source of resins: Resins are used commercially for manufacturing sealing waxes and water-proof paints. A type of resin known as turpentine is obtained from various species of Pinus.
Posted by Arvind Mishra 5 years ago
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?Garima Sharma? 5 years ago
Mehak Gautam 5 years ago
Posted by Deepu Sharma 5 years ago
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Yogita Ingle 5 years ago
Primary Metabolites:
1.These are the metabolites which have identifiable metabolism functions and play a specific role in the metabolism.
2.These are important in human metabolic processes. e g Amino acids, sugars.
Secondary Metabolites:
1.These are the metabolites formed during metabolism, whose role or exact functions in the tissue are not . known.
2.These are useful to human .e.g., Alkaloids, flavonoids
Posted by Ayushi Sharma 5 years ago
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?Garima Sharma? 5 years ago
Posted by Munna Singh 5 years ago
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Mehabub Hassan 5 years ago
Posted by Nisha Butar 5 years ago
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Yogita Ingle 5 years ago
- The plant is described beginning with its habit, vegetative characters such as roots, stem and leaves and then floral characters inflorescence and flower parts.
- After describing various parts of plant, a floral diagram and a floral formula are presented, which is represented by some symbols.
- In the floral formula, Br stands for bracteate K stands for calyx , C for corolla, P for perianth, A for androecium and G for Gynoecium, G for superior ovary and G for inferior ovary, for male, for female , ⊕ for actinomorphic and for zygomorphic nature of flower.
- Fusion is indicated by enclosing the figure within bracket and adhesion by a line drawn above the symbols of the floral parts.
- A floral diagram provides information about the number of parts of a flower, their arrangement and the relation they have with one another.
- The position of the mother axis with respect to the flower is represented by a dot on the top of the floral diagram.
- Calyx, corolla, androecium and gynoecium are drawn in successive whorls, calyx being the outermost and the gynoecium being in the centre.
- Floral formula also shows cohesion and adhesion within parts of whorls and in between whorls.
Posted by Acharya Singhpur 5 years ago
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Pawni Chaudhary 5 years ago
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Posted by आदर्श त्रिपाठी 5 years ago
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Mehabub Hassan 5 years ago
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Pawni Chaudhary 5 years ago
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Ritik Kumar Singh 5 years ago
Posted by Deepu Sharma 5 years ago
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Pawni Chaudhary 5 years ago
Yogita Ingle 5 years ago
Dorsiventral leaves are found in dicots. The vertical section of a dorsiventral leaf contains three distinct parts.
[1] Epidermis: Epidermis is present on both the upper surface (adaxial epidermis) and the lower surface (abaxial epidermis). The epidermis on the outside is covered with a thick cuticle. Abaxial epidermis bears more stomata than the adaxial epidermis.
[2] Mesophyll: Mesophyll is a tissue of the leaf present between the adaxial and abaxial epidermises. It is differentiated into the palisade parenchyma (composed of tall, compactly-placed cells) and the spongy parenchyma (comprising oval or round, loosely-arranged cells with inter cellular spaces). Mesophyll contains the chloroplasts which perform the function of photosynthesis.
[3] Vascular system: The vascular bundles present in leaves are conjoint and closed. They are surrounded by thick layers of bundle-sheath cells.
Posted by Aman Rayeen 5 years ago
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Pawni Chaudhary 5 years ago
Yogita Ingle 5 years ago
The first formed xylem elements are called protoxylem, while the later formed primary xylem is called metaxylem.
- In stems, the protoxylem lies towards the centre (pith) and the metaxylem lies towards the periphery of the organ, this type of primary xylem is called endarch.
- In roots, the protoxylem lies towards periphery and metaxylem lies towards the centre, such arrangement of primary xylem is called exarch.
Posted by Birjesh Kumar 5 years ago
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Pawni Chaudhary 5 years ago
Raina Ahlawat 5 years ago
Posted by Nikita Chauhan 5 years ago
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Debashrita Dash 5 years ago
Posted by Nikita Chauhan 5 years ago
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Gaurav Seth 5 years ago
Cell division is a very important process in all living organisms. During the division of a cell, DNA replication and cell growth also take place. All these processes, i.e., cell division, DNA replication, and cell growth, hence, have to take place in a coordinated way to ensure correct division and formation of progeny cells containing intact genomes.
Posted by Nikita Chauhan 5 years ago
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Sia ? 5 years ago
Plasmolysis is when plant cells lose water after being placed in a solution that has a higher concentration of solutes than the cell does. This is known as a hypertonic solution. Water flows out of the cells and into the surrounding fluid due to osmosis.
Mohammad Amaan 5 years ago
Posted by Nikita Chauhan 5 years ago
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Meghna Thapar 4 years, 3 months ago
Functions:
- Its functions include the storage, modification and packaging of products in vesicles.
- In some cases, complex sugars may be made from simple sugars in the Golgi apparatus.
- The Golgi apparatus is also involved in the formation of lysosomes, cell wall and plasma membrane.
Posted by Nikita Chauhan 5 years ago
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Mohammad Amaan 5 years ago
Mohammad Amaan 5 years ago
Posted by Nikita Chauhan 5 years ago
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Sia ? 5 years ago
Plant reproductive system, any of the systems, sexual or asexual, by which plants reproduce. In plants, as in animals, the end result of reproduction is the continuation of a given species, and the ability to reproduce is, therefore, rather conservative, or given to only moderate change, during evolution.
Posted by Nikita Chauhan 5 years ago
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Unnati Pragya 5 years ago
Posted by Nikita Chauhan 5 years ago
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Sia ? 5 years ago
| Anaphase of Mitosis | Anaphase I of Meiosis |
| 1. The centromere of every chromosome divides. | 1. The centromere do not divide. |
| 2. Separation of sister chromatids takes place. | 2. Homologus chromosome are separated. |
| 3. Only one chromatids of every chromosome moves to the pole (now called daughter chromosome). | 3. Each homologous pair of chromosomes moves to the pole with both the chromatids. |
| 4. The chromatids moving to one pole are genetically identical to those moving to the opposite pole (Before separation, these are sister chromatids held at a common centromere). | 4. The chromosomes moving to one pole are not genetically indentical to those moving to the opposite pole. |
Posted by Nikita Chauhan 5 years ago
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Meghna Thapar 4 years, 3 months ago
The Golgi apparatus was first described by Camillo Golgi. Golgi apparatus consists of a set of membrane-bounded, fluid filled vesicles, vacuoles and flattened cisternae. Cisternae are usually stacked together (placed one above the other) in parallel rows. Golgi apparatus exists as an extensive network near the nucleus in the animal cells. However, the plant cells contain many freely distributed subunits of Golgi apparatus, called dictyosomes. The Golgi apparatus arises from the membrane of the smooth endoplasmic reticulum, which in turn, originates from the rough endoplasmic reticulum.
Posted by Harshit Rastogi 5 years ago
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Mehak Gautam 5 years ago
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Pawni Chaudhary 5 years ago
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