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Ask QuestionPosted by Abhay Kumar 5 years, 3 months ago
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Posted by Abhay Kumar 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
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Posted by Abhay Kumar 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Odometer is a device that measures the distance travelled by an automobile based on the perimeter of the wheel as the wheel rotates.
Posted by Abhay Kumar 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Law of constant proportion states that, “a pure chemical compound always consists of the same elements that are combined together in a fixed (or definite) proportion by mass”.
For instance, the ratio of hydrogen and oxygen in water obtained from any source is 1:8 i.e. 1g of hydrogen and 8g of oxygen together make up 9g of water.
Similarly the ration of nitrogen and hydrogen in ammonia is 14:3.
Posted by Abhay Kumar 5 years, 3 months ago
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Yogita Ingle 5 years, 3 months ago
Archimedes’ principle state that, “when a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the liquid displaced by it.”
Applications
(i) It is used in designing ships and submarines.
(ii) It is used in making lactometers, which are used to determine the purity of milk.
Posted by Abhay Kumar 5 years, 3 months ago
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Nidhi Dhariwal 5 years, 3 months ago
Yogita Ingle 5 years, 3 months ago
Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens (chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).
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Yogita Ingle 5 years, 4 months ago
Vultures are scavengers as they feed upon dead animals. Saprotrophs is the correct word instead of saprophytes because phytes means plants.They are not considered as sparotrophs as saprotrophs take their nutrition from dead and decaying matter by dissolving them and absorbing through their body surface. Vultures do not use this method so they are not classified under saprotrophs.
Posted by Abhay Kumar 5 years, 4 months ago
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Posted by Bhavani Chilad 5 years, 4 months ago
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Meghna Thapar 5 years, 4 months ago
Diffusion just simply means being seperated.Some of the examples in our daily life are:-
1)U can smell perfume because it diffuses into the air and makes it may into ur nose
2)A teabag placed in a cup of hot water will diffuse into the water.
3)Placing food coloring in a liquid will diffuse the color.
4)Digested particles of the food diffuses in the colon.
5)A helium balloon will deflate a small amount everyday as helium diffuses through the balloon into the air.
Yogita Ingle 5 years, 4 months ago
Examples of Diffusion
- A teabag immersed in a cup of hot water will diffuse into the water and change its colour.
- A spray of perfume or room freshener will get diffused into the air by which we can sense the odour.
- Sugar gets dissolved evenly and sweetens the water without having to stir it.
- As we lit the incense stick, its smoke gets diffused into the air and spreads throughout the room.
- By adding boiling water into the dried noodles, the water diffuses causing rehydration and making dried noodles plumper and saturated.
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Yogita Ingle 5 years, 4 months ago
Plastids refer to the double membrane bound organelles found in plant cells.
* They are found in the cytoplasm.
* Plants make and store food in plastids.
* They have their own DNA and Ribosomes.
* They can be classified into two types:
- Chloroplast
- Leucoplast
* Chloroplasts are the plastids containing the green pigment called chlorophyll. They are necessary to carry the process of photosynthesis.
* Chloroplasts also contain orange and yellow pigments.
* Leucoplast stores starch, oils and protein granules.
* Plastids have many membranous layers embedded in surface called stroma.
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Yogita Ingle 5 years, 4 months ago
- The Green Revolution involved the production of high yielding varieties (often abbreviated to HYV) of seeds, resulting in an increase in agricultural production to combat food shortage and increase the revenue of the agricultural sector.
- The white revolution involved the operation flood that enhanced the production of milk and also resulted in the increased animal input that went into the dairy industry. The White revolution saw a huge increase in the productivity of the dairy industry.
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Meghna Thapar 5 years, 4 months ago
At room temperature (anywhere from zero degree centigrade to 100 degrees centigrade), water is found in a liquid state. This is because of the tiny, weak hydrogen bonds which, in their billions, hold water molecules together for small fractions of a second. Water molecules are constantly on the move.
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Yogita Ingle 5 years, 4 months ago
Sublimation is the process in which solid turns directly into gas without converting into liquid.
The substances undergoing sublimation are termed as sublimates.
Heating
Solid <=========> Gas
Examples :
Ammonium Chloride is white solid on heating it sublimes.
Iodine .
Dry ice.
Posted by Debjani Karan 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
| Appearance | Cloudy, heterogeneous, at least two substances visible | Cloudy but uniform and homogeneous |
| Particle Size | larger than 10,000 Angstroms | 10-1000 Angstroms |
| Effect of Light (Tyndall Effect) | variable | light is dispersed by colloidal particles |
| Effect of Sedimentation | particles will eventually settle out |
none |
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Yogita Ingle 5 years, 3 months ago
Three diseases caused by virus are:
(a) Influenza (b) Hepatitis (c) AIDS
AIDS (Acquired Immuno Deficiency Syndrome).
Cause : Retro virus HIV (Human Immuno Deficiency Virus).
Mode of Communication:
(i) Blood transfusion.
(ii) Unprotected sexual contact.
(iii) Use of contaminated needles and syringes, sharing razors, piercing instruments, etc.
(iv) From mother to the developing foetus through placenta.
Symptoms:
(i) Prolonged fever.
(ii) Swollen lymph glands.
(iii) Weightloss and loss of appetite.
(iv) Unexplained bleeding.
(v) Decreased count of blood platelets causing haemorrhage.
(vi) Loss of memory and mental ability.
(vii) Patient becomes susceptible to other diseases.
Detection :
It is done by ELISA TEST and Western Blood test.
Prevention:
(i) Safe ***.
(ii) Use of disposable syringe and needles and fresh razors for shaving.
(iii) Testing the blood before transfusion.
(iv) Education of the masses through AIDS awareness programmes.
(v) Avoid pregnancy of HIV infected mother.
Treatment : There is no cure for AIDS so far.
1Thank You