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Yogita Ingle 7 years, 2 months ago
Hypotonic solutions are the ones which have a lower concentration of solute than the cell. Water diffuses into the cell to balance the solute concentration on either side (outside and inside) equal. Here the cell swells up due to entry of water.
Hypertonic solutions are the ones which have higher solute concentration than the cell. Water moves out of the cell through cell membrane to balance the concentration of the solute on either side. It results in cell shrinking .This may also lead to desiccation of the cell.
Isotonic solutions have the same concentration of the solute as the cell. Water moves in and out of the cell with no net change.
Posted by Aman Kumar 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
A rain Gauge is an instrument used by the meteorologists and hydrologists in order to gather and calculate the quantity of liquid precipitation over a recorded period of time. Record the result and then study the findings.
Posted by Kunal Sahu 7 years, 2 months ago
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Nisha Sharma 7 years, 2 months ago
Kumkum Sarswat 7 years, 2 months ago
Jayasri G Sruthi 7 years, 2 months ago
Aditya Rajput 7 years, 2 months ago
Posted by Pritha Rai 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
| Plasma Membrane | Cell Wall |
| Plasma Membrane is a delicate, thin structure of around 5-10nm wide and is visible under electron microscope, and it is present in all types of cell, helps in the passage of molecules and protects the protoplasm. | Cell Wall is a thick, rigid structure of around 4-20um wide and is visible under light microscope; it is present in plant cell, bacterial and fungal cell, helps in providing shape and rigidity to the cell. |
| Cell Wall is present in the plant cell, bacteria, fungi and algae. | Cell Wall is present in the plant cell, bacteria, fungi and algae. |
| Made up of lipids and proteins and carbohydrates. | Made up of cellulose (plant cell), chitin (fungi), and peptidoglycan (bacteria). |
Posted by Allwin Roshan 5 years, 11 months ago
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Sai Varsha Konakanchi 7 years, 2 months ago
Posted by Siya Bansal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
| Plant Cells | Animal Cells |
| Plant cells possess cell wall. | Animal cells do not possess cell wall. |
| Chloroplasts are present in plant cells. | Animal cells do not possess chloroplasts. |
| Plant cells are almost rectangular in shape. | Animal cells are round in shape. |
| Plant cells possess large vacuoles. | Animal cells have many small vacuoles. |
| Cilia rarely occur in plant cells. | Cilia are present in animal cells. |
| Higher plants do not possess centrioles. | Animal cells do contain centrioles. |
| Plant cells have no or less number of lysosomes. | Animal cells possess many number of vacuol |
Tanishq Sharma 7 years, 2 months ago
Posted by Palak Bansal 7 years, 2 months ago
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Alok Kumar 7 years, 2 months ago
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
PhotoChemical Smog: It is also known as Los Angeles Smog. This type of smog was first observed in Los Angeles in 1950.
Actually it is a mixture of a no. of irritating chemical compounds like, NO2, O3, PAN( peroxyacylnitrates), aldehydes, ketones, hydrocarbons and CO.
It is formed in summer as, when NO2 and hydrocarbons are mixed in air and that air is exposed to extreme sunlight.
Harmful Effects:
- All these compounds like PAN and ozone, produces irritatio to the eyes and also in respiratory system.
- They also damage many materials such as , metals, stones, building materials etc.
- Ozone is particularly destructive to rubber.
- The smog is harmful to fabrics, crops and ornamental plants.
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
The temperature at which liquid changes into its gaseous state is called as boiling point.
During boiling of a liquid, say water or milk, heating is to be done from the bottom of the vessel to bring the temperature of the entire liquid to its boiling point - so it is a bulk phenomenon. But in case of evaporation, the liquid evaporates from the top surface without heating, for example, evaporation of water from the surface of a lake or vesssel. Thus, evaporation is a surface phenomena.
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
AIDS is a disease that can develop in people with HIV. It’s the most advanced stage of HIV.
Symptoms of AIDS can include:
- recurrent fever
- chronic swollen lymph glands, especially of the armpits, neck, and groin
- chronic fatigue
- night sweats
- dark splotches under the skin or inside the mouth, nose, or eyelids
Prevention and Control
- Safe ***. Using a new, un-compromised condom during *** prevents the transmission of virus through open sores or open skin.
- Occupational safety. Medical care providers and scientists who frequently treat patients or handle patient samples must use personal protection equipment and follow safety guidelines set by their respective institutions.
- Needle exchange programs. These programs provide sterile needles to those who inject drugs.
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Mariculture is a specialized branch of aquaculture which involves the cultivation of marine organisms for food and other products in the open ocean. Mariculture helps in production of marketable food, to remove toxicity of sewage water, to produce substances for industrial use, medicinal use and food processing industries.
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
1. Overstaining and understaining should be avoided.
2. Folding of the peel should be avoided.
3. Clean and dry glass slide and coverslip should be used.
4. Cover slip should be kept gently on the slide to avoid entry of air bubbles.
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
According to the inverse-square law of gravitaion, the force of gravitation on a planet should decrease as the square of the distance of the planet from the sun.
Newton further showed that the gravitational force is proportional to the product of the masses of the two objects.
Thus, Newton formulated the universal law of gravitation.
Posted by Aman Barnwal 7 years, 2 months ago
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Posted by Aman Barnwal 7 years, 2 months ago
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Posted by Aman Barnwal 7 years, 2 months ago
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Gaurav Seth 7 years, 2 months ago
The chemical or molecular formula for sucrose/sugar is :
C12H22O11
which means each molecule of sugar contains 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms.
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Newton is the SI unit of force.
Pascal is the SI unit of pressure.
1 Pascal is equal to 1 Newton over a square meter.
Pa = N/m2
Some conversions of Pa:
1 kilo Pascal (kPa) equals 1000 Newtons over a square meter.
1 mega Pascal (MPa) equals 1 Newton over a square millimeter, or 1 million newtons over a square meter.
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Functions of areolar tissue.
(i) It fills the space inside the organs, thus acts as a packing tissue between the organs.
(ii) It supports many delicate organs in the body.
(iii) It plays role in repair of tissues.
Posted by Aman Barnwal 7 years, 2 months ago
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Yogita Ingle 7 years, 2 months ago
Weeds are the undesirable plants that grow in fields along with the crops. They damage the crops by using the same nutrients that crop plants use, often in very similar proportions. Weeds are unwanted plants in the cultivated field. For example, Xanthium (Gokhroo), Amaranthus (Chaulai), Parthenium (Gajar ghas), Chenopodium (Bathua), Avena sativa (Wild oat).
1) Amaranthus(Chulai) 2) Chenopodium(Bathua) are the weeds that grow with wheat and paddy.
Posted by Aman Barnwal 7 years, 2 months ago
- 1 answers
Yogita Ingle 7 years, 2 months ago
Epidermis is present on the outer surface of the whole plant body. The cells of the epidermal tissue form a continuous layer without any intercellular space. It performs the following important functions:-
- Cells of epidermis are water resistant thus prevent excess loss of water.
- It is a protective tissue which protect the plant body
- It allows exchange of gases through the stomata
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Gaurav Kumar 7 years, 2 months ago
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