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Posted by Shubham Jain 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
Nitric acid is a strong oxidising agent so, the hydrogen formed in the reaction between a metal and nitric acid is oxidised to water and hence there is no evolution of hydrogen gas.
Posted by Jaspreet Kaur 5 years, 11 months ago
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Meghna Thapar 5 years, 10 months ago
Ethanol is prepared by the fermentation of molasses into simpler compounds with the help of microorganisms like yeast.
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The electron-dot structure for hydrogen sulphide (H2S):
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Meghna Thapar 5 years, 10 months ago
Curvature Movement: They are changes in orientation of some plant parts in relation to others caused by intrinsic or external stimuli, e.g., sleep movement or nyctinasty of legume leaves, bending of stem towards the light.
Posted by Chanchal Patel 5 years, 11 months ago
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Meghna Thapar 5 years, 10 months ago
The major organs of respiratory system in human beings are: (i) Nose (ii) Nasal Passage (iii) Trachea (iv) Bronchi (v) Lungs and (vi) diaphragm.
In human beings, air is taken into the body through the nostrils, is filtered by fine hairs that line the passage. When air passes through the nasal passage, the dust particles and other impurities present in it are trapped by nasal hair and mucus so that clean air goes into the lungs. From here, the air passes through the throat and into the lungs. Trachea does not collapse even when there is no air in it because it is supported by rings of soft bones called cartilage.
Within the lungs, the passage divides into smaller and smaller tubes which finally terminate in balloon-like structures which are called alveoli. The alveoli provide a surface where the exchange of gases can take place. The walls of the alveoli contain an extensive network of blood-vessels. When we breathe in, the ribs are lift up and the diaphragm flattens which increases the size of the chest cavity. Because of this, air is sucked into the lungs and fills the expanded alveoli. The blood brings carbon dioxide from the rest of the body for release into the alveoli, and the oxygen in the alveolar air is taken up by blood in the alveolar blood vessels to be transported to all the cells in the body. During the breathing cycle, when air is taken in and let out, the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.
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Yogita Ingle 5 years, 11 months ago
Gregor Mendel chose pea plant because the garden pea is an ideal subject in the study of genetics for the following reasons:
(i)They grow quickly.
(ii)They have a short life-cycle.
(iii)They are easily self- and cross-pollinated and produces many offspring in one cross.
(iv)They have easily observed characteristics.
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Posted by Partik Kumar 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
A Mendelian’s experiment consists of breeding a pea plant bearing violet flowers with pea plant that bear white flowers.
The intermediate colours do not get a chance to appear in the offspring of cross-pollinated pea plants.
The result in f1 progeny will be violet flower because it is dominant over the white flower.
Posted by Akash Akash 5 years, 11 months ago
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Yogita Ingle 5 years, 11 months ago
|
Nervous System |
Endocrine System |
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Formed from collection of neuron cells |
Formed from set of glands |
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Electrochemical pulses are the mean of signal transmission |
Hormones are the means of signal transmission |
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Use the neurons to transmit the signal |
Use the circulatory system to transmit the signal |
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Signal transmission is fast |
Signal transmission is slow |
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The cells are interconnected to form electrical pulses |
The organs are not connected ; hence individual glands relese individual chemicals(hormones) |
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Yogita Ingle 5 years, 11 months ago
Bile juice is a digestive juice secreted by the liver. Although it does not contain any digestive enzymes, it plays an important role in the digestion of fats. Bile juice has bile salts such as bilirubin and biliverdin. These break down large fat globules into smaller globules in the small intestine so that the pancreatic enzymes can easily act on them. This process is known as emulsification of fats. Bile juice also makes the medium alkaline and activates lipase.
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