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Yogita Ingle 4 years, 10 months ago
Intrinsic factors:
i. Malfunctioning of some vital body organs and immune system.
ii. Genetic disorder.
iii. Hormonal imbalances.
Extrinsic factors:
i. Unbalanced or inadequate diet.
ii. Disease causing microorganisms.
iii. Environmental pollutants.
iv. Bad food and drinking habits.
Posted by Trushti Parmar 4 years, 10 months ago
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M Malar Vizhi 4 years, 10 months ago
Posted by Satish Goyal 4 years, 10 months ago
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Yogita Ingle 4 years, 10 months ago
(a) Cytoplasm: It is a fluid that fills the cell and occurs between the plasma membrane and the nucleus. Cell organelles such as mitochondria, ribosomes, Golgi bodies, etc. are suspended in the cytoplasm. The cytoplasm helps in the exchange of materials between cell organelles.
(b) Nucleus of a cell: Nucleus is the master of the cell. It commands all the functioning of the cell. It is generally located in the center of the cell and is spherical in shape. A membrane called nuclear membrane separates it from cytoplasm. It contains the genetic material DNA and RNA in it. This porous membrane allows the transfer of material in the nucleus and cytoplasm. Nucleus contains a dense body called Nucleolus which actually contains chromosomes, the genetic material.
Posted by Vivaan Agarwal 4 years, 10 months ago
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Posted by Sakshi Jagtap 4 years, 10 months ago
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Yogita Ingle 4 years, 10 months ago
Valency
It is the ability of an atom to gain or lose electron in order to achieve the noble gas configuration. It refers to the ability of an element to combine with other element. It is obtained by determining the number of electrons in the outermost shell (also called valence shell) of each atom of an element. For instance, sodium has 1 electron in its outermost shell and hence valency of sodium is 1.
Atomic number of sodium is 11. So the electronic configuration stands out to be 2,8,1 i.e. there is one electron in the outermost shell. In order to gain inert gas configuration it is better for sodium to lose one electron and achieve the nearest noble gas configuration of neon with atomic number 10.
On the other hand atomic number of chlorine is 17. So electronic configuration stands out to be 2,8,7. In order to achieve noble gas configuration to become stable it requires one electron then it will acquire the configuration of neon (noble gas). Therefore valency of chlorine is1.
Posted by Sakshi Jagtap 4 years, 10 months ago
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Sakshi Jagtap 4 years, 10 months ago
Posted by Sahil Singh 4 years, 10 months ago
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Sakshi Jagtap 4 years, 10 months ago
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Sakshi Jagtap 4 years, 10 months ago
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Yogita Ingle 4 years, 10 months ago
| Xylem | Phloem |
| 1. It conducts water and minerals from roots to leaves. | 1. It conducts food from leaves to all parts of the plant. |
| 2. It is composed of mainly dead elements. | 2. It is composed of mainly living elements. |
| 3. Transport is unidirectional. | 3. Transport is bidirectional. |
| 4. It has four types of cells: Tracheids, Vessels, Xylem parenchyma and Xylem fibres. | 4. It has four types of cells: Phloem fibres, Sieve tubes, Companion cells and Phloem parenchyma. |
E.S Sahu 4 years, 10 months ago
Posted by Sahil Singh 4 years, 10 months ago
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Posted by Sahil Singh 4 years, 10 months ago
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Sakshi Jagtap 4 years, 10 months ago
2Thank You