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Yogita Ingle 5 years, 10 months ago
| Homologous organs | Heterologous (analogous) organs |
| The organs having the same origin, anatomy but different functions are called homologous organs. | The organs having the same functions but different in structure, origin and constituting parts are called analogous organs. |
| Homologous organs show divergent evolution. | Heterologous organs shows convergent evolution. |
| For example, forelimb of human, bat, cat. | For example, the wings of bats and the wings of birds. |
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Yogita Ingle 5 years, 10 months ago
Importance of transpiration:
- Transpiration leads to the concentration of sap in the plant cell, which helps in osmosis.
- Transpiration has a cooling effect on plant.
- Salts moves upwards in the plant due to transpiration.
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Posted by Miss. 1234 ❤️ 5 years, 10 months ago
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Yogita Ingle 5 years, 10 months ago
- The nervous system uses "electrical signals" to control and coordinate through the neurons, neurotransmitters and action potentials; whereas, the endocrine system uses chemical signals through the hormones as chemical messengers.
- The 'nervous system' acts in quick response to a stimulus but endocrine system acts slowly by secreting and transporting hormones to the target cells.
- The actions brought about by nervous system are localized, mostly temporary and also reversible. The actions are widespread and permanent.
Meghna Thapar 5 years, 10 months ago
The nervous system consists of special cells called neurons. It can be divided into two main parts – central nervous system and peripheral nervous system.
Neurons are specialized cells of the nervous system. They use electrical and chemical signals for transferring information.
Functions of nervous system:
- The function of the nervous system is to coordinate the activities of our body.
- It helps all other systems of our body to work together.
- It receives information from the surroundings, processes it, interprets it and then responds accordingly. However, the endocrine glands do not have ducts to secrete their hormones. They release hormones directly into the blood of a person and reach the concerned body part through the blood and act on it.
Posted by Kaushik Herle 5 years, 10 months ago
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Meghna Thapar 5 years, 10 months ago
- Source of energy is one which can provide adequate amount of energy in a convenient form over a long period of time.
- The materials which can be burnt to produce heat energy are known as fuels. Example - Wood, coal, petrol, kerosene etc. are fuels.
- Solar Cell: It is a device which converts solar energy in to electrical energy.
- Solar cell panel consist of a large number of solar cells jointed in a definite pattern that is used to convert the solar energy in to electricity.
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