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Meghna Thapar 4 years, 5 months ago
Plant cells, in addition to the plasma membrane, have another rigid outer covering called the cell wall. It lies outside the plasma membrane. It is mainly composed of cellulose. Cellulose is a complex substance and provides structural strength to plants. When a living plant cell loses water through osmosis there is shrinkage or contraction of the contents of the cell away from the cell wall. This phenomenon is known as plasmolysis.
Functions of cell wall:
i. It permits the plant cell to become turgid.
ii. It provides mechanical strength to support the cell.
iii. It is freely permeable to water and substances in solution.
iv. Cell wall permits the cells of plants, fungi and bacteria to withstand very dilute (hypotonic) external media without bursting.
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Yogita Ingle 4 years, 5 months ago
Working of a pinhole camera
- Place a luminous object such as a burning wick (XY) of the candle in front of the pinhole, an inverted picture X’Y’ of the wick is obtained on the wax paper. This picture is called the image.
- The image obtained is inverted.
- Such an image is formed because the light travels in a straight path. Hence, light from the upper point X of the wick passes through the pinhole and strikes the wax paper at X’.
Similarly, light from the lower point Y of the wick passes through the pinhole and strikes the wax paper (or screen) at Y'. - When light from all other points between X and Y passes through the pinhole they strike the wax paper in between X' and Y'. Hence, an inverted image is formed on the wax paper.
Posted by Mani Monga 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
MgCl2 can be extracted from sea water or brine and is chemically named as Magnesium Chloride.
Magnesium Chloride is also called Magnesium dichloride or magnesium (II) chloride or Chloromagnesite and has one magnesium (Mg) and two chloride ions (Cl-).
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Meghna Thapar 4 years, 5 months ago
The shape and size of cells are related to the specific function they perform. Some cells like Amoeba have changing shapes which helps in its locomotion. The shape of the cell may be variable like white blood cells. Fixed shape of cell occurs in most plants and animals.
The size of different cells ranges between broad limits. Some plant and animal cells are visible to the naked eye however, some are microscopic.
Each living cell has the capacity to perform certain basic functions that are characteristic of all living forms. There is a division of labour in multicellular organisms such as human beings. Different parts of the body perform different functions like the human body has a heart to pump blood and stomach to digest food. Similarly, division of labour is also seen within a single cell. Each cell has got certain specific components within it known as cell organelles which perform a special function such as making new material in the cell, clearing up the waste material from the cell.
Posted by Dhruv Saini 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
Leeuwenhoek discovered protozoa.
In 1674, with the help of improved microscope, A. Leeuwenhoek discovered the free living cells in pond water for the first time.
Posted by Jeevitha R 4 years, 5 months ago
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Meghna Thapar 4 years, 4 months ago
Molybdenum is an essential trace mineral. It is found in foods such as milk, cheese, cereal grains, legumes, nuts, leafy vegetables, and organ meats. Molybdenum is most commonly used for molybdenum deficiency. Some electrical filaments are also made from molybdenum. The metal is used to make some missile and aircraft parts and is used in the nuclear power industry. Molybdenum is also used as a catalyst in the refining of petroleum. Molybdenum is primarily used as an alloying agent in steel.
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Gaurav Seth 4 years, 5 months ago
Heat required to change the state of a body from one to another without changing its temperature is called as latent heat
Latent heat is of two types:
i)Latent heat of fusion(Lf)
ii)Latent heat of vaporization(Lv)
Posted by Sonali Singh 4 years, 5 months ago
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Gaurav Seth 4 years, 5 months ago
- Proteins are synthesised by ribosomes which are RNA protein complexes. Ribosomes translate the mRNA into proteins.
- In prokaryotic cells, proteins are synthesised in the cytosol because membrane bound cell organelles are absent and ribosomes are present in the cytosol.
- In eukaryotic cells, proteins are synthesised in the rough endoplasmic reticulum or RER as ribosomes are present on the membrane of RER. Proteins are synthesised by the ribosomes and enter the cisternae of endoplasmic reticulum through channels present in the membrane.
Posted by Ashok Kumar 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
- Zaid Cropping season - April- May
- Zaid cropping season is during summer season in India.
- Zaid crops are Water melons, Bitter gourds, Musk melons, Vegetables etc
- The significance of Zaid season is that crops grown on irrigated lands as they are grown before monsoon arrival time.
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Yogita Ingle 4 years, 5 months ago
Multicellular organisms
- Multicellular organisms are composed of many cells.
- The labour of performing different functions is divided between the various cells in these organisms.
- Some multicellular organisms have different cells. For example, Human beings have different cells of different shapes and sizes in their body to perform different functions.
Posted by Tejaswini K 4 years, 5 months ago
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Vaibhav Kumar 4 years, 5 months ago
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Isha Sharma 4 years, 5 months ago
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