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Ask QuestionPosted by Lucky Rajput 7 years ago
- 2 answers
Yogita Ingle 7 years ago
1) External fertilization occurs in fish and frog.
2) The females lays a vast number of eggs in water & males releases some millions of sperms on to them.
3) Eggs may be carried to a long distance by water currents or they may be eaten by predators.
4) So,fertilization is a chance factor & controlled by nature.
Hence it is inevitable to produce a vast number of eggs by fish & frog.
Posted by Aryan Salunke 7 years ago
- 1 answers
Gaurav Seth 7 years ago
Carbonization or carbonisation is the term for the conversion of an organic substance into carbon or a carbon-containing residue through pyrolysis or destructive distillation. It is often used in organic chemistry with reference to the generation of coal gas and coal tar from raw coal.
Posted by Himanshu Kumar 7 years ago
- 3 answers
Posted by Deep Rot 7 years ago
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Renuka Seiwal 7 years ago
Internal fertilization occur in hens.egg is layed and hatched by hen. From egg chicken is coming out.
Posted by M B Ashoka 7 years ago
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Gaurav Seth 7 years ago
The reaction in which a substance reacts and combines with oxygen to give off heat and sometimes light is known as combustion reaction. For ex-
C + O2 -------> CO2
Posted by Shivam Kumar 7 years ago
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Royal Girl 7 years ago
Posted by Sai Deshmukh 7 years ago
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Hitarth Padaliya 7 years ago
Posted by Keerthana C 7 years ago
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Posted by Kunal Kishor 7 years ago
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Posted by Kashish Goyal 7 years ago
- 1 answers
Yogita Ingle 7 years ago
| DEFORESTATION | AFFORESTATION |
| Destruction of trees in the forest area and converting large area of land as a habitat for human beings is called as deforestation | Afforestation is planting of trees in barren lands to increase the area under forests. |
| Deforestation has many ill-effects on the environment. | Afforestation influences the climate of a particular area and shows positive effect on the environment. |
| Different causes for deforestation are urbanisation, industrialisation, construction of irrigation structures, forest fires, mining activities,wood collection etc. | Different causes for afforestation are to maintain the favourable temperature in the environment, regulate monsoons causing rainfall, restoring forests, providing habitat for wild life, prevent soil erosion etc. |
| Deforestation leads to increased carbon dioxide levels, global warming, late arrival of monsoon, effect on climate, loss of habitat by wildlife etc | Afforestation helps in maintaining balance in the nature. |
| Deforestation should be controlled | Awareness about afforestation should be created. Different afforestation programmes in India are Social Forestry, Agro Forestry and Urban Forestry Programme. |
Posted by Kashish Goyal 7 years ago
- 1 answers
Krutika Raipurkar 7 years ago
Posted by Akanksha Sandhu 7 years ago
- 2 answers
Yogita Ingle 7 years ago
The innermost zone is the zone which is formed just around the wick of the candle flame as the candle burns. It is also known as dark zone of the flame. It consists of hot, unburnt vapours of the combustible material. There is no air present here. It is the least hot of all the zones.
The outermost zone also known as non-luminous zone is the zone of complete combustion. The ample presence of oxygen (or air) aids in complete combustion. It is the hottest zone of the candle flame and does not produce much light. It is blue in colour.
The middle zone also known as luminous zone is the zone which is moderately hot with limited oxygen supply. Hence, the fuel vapours burn partially and produce carbon particles. These particles then leave the flame as smoke and soot. This zone is the major part of the flame. The colour of this zone is yellow.
Kaivalya Mase 7 years ago
Posted by Anush Saravanan 7 years ago
- 1 answers
Meghna Thapar 5 years, 6 months ago
Ursa Major constellation lies in the northern sky. Its name means “the great bear,” or “the larger bear,” in Latin. The smaller bear is represented by Ursa Minor. ... Its brightest stars form the Big Dipper asterism, one of the most recognizable shapes in the sky, also known as the Plough.
Phases of the Moon: The various shapes of the bright part of the moon as seen during a month are called phases of moon.
The moon revolves round the earth. It also revolves round the sun along with the earth. The various stages of the moon during a month are shown in Fig. 17.1.
In position 1, the part of the moon facing earth does not receive light from the sun.
Hence it appears dark. The other part of the moon that is facing away from earth is lit by the sun light. This position of moon, when it appears dark on earth is known as new moon.
In position 2, 3 and 4, we see the moon not as a full disc but as a cresent. Position 2 of the moon is known as cresent moon, Position 3 as first quarter and position 4 as Gibbous (bright part is greater than a semicircle) moon.
In position 5, the Sun's rays fall directly on the part of the moon facing earth. In this position we see the moon as a full disc of light. This position of moon is known as full moon.
Posted by Farhina Ilyas Sani 7 years ago
- 2 answers
Posted by Shreya Rana 7 years ago
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Meghna Thapar 5 years, 6 months ago
Optical density is the process of transmission of light or other electromagnetic radiation by matter. The process of emission and absorption depends on the radiation's wavelength, which includes the interaction between fundamental particles like electrons, atoms, ions etc. A higher optical density indicates how much slower the wave travels through that material. The refractive index of the material is an indicator of its optical density. ... In spectroscopy, the optical density and absorbance measurements provide information about different properties of the sample.
Posted by Ujjwal Raj Pandey 7 years ago
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Posted by Piyush Tripathi 7 years ago
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Posted by Akash P 7 years ago
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Yuktarani Parashar 7 years ago
Posted by Ragini Singh 7 years ago
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Neha Gurjar 7 years ago
Posted by Bashar Khan 7 years ago
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Meghna Thapar 5 years, 10 months ago
Once puberty is reached in girls, ovaries begin to produce the female hormone, estrogen which helps in the development of breasts. Milk secreting glands or mammary glands develop inside the breasts.
Posted by Kumkum Kushwaha 7 years ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
During spring or rainy season, frogs and toads move to ponds and slow-flowing streams where the male and female come together and lay hundreds of eggs. A layer of jelly holds the eggs together and provides protection to them. The males deposits sperms over them which swims randomly in water. Fertilization takes place when the sperms come in contact with the eggs. Such type of external fertilization takes place in aquatic animals like fish, starfish, etc.
Posted by Shivani???? Meher 7 years ago
- 1 answers
Meghna Thapar 5 years, 10 months ago
During rainy season, we see a flash of light in the clouds in the sky followed by a loud sound called lightning. Lightning is an electric discharge in the atmosphere between oppositely charged clouds. Lightning is produced by the electric charges in the sky. The electric nature of lightning was established by a scientist named Benjamin Franklin.
Posted by Xyz Xyz 7 years ago
- 1 answers
Yogita Ingle 7 years ago
Endoplasmic reticulum is a continuous membrane, which is present in both plant cells, animal cells and absent in prokaryotic cells. It is the membrane of network tubules and flattened sacs, which serves a variety of functions within the cell. The space, which is present in the endoplasmic reticulum, is called as the lumen.
The major functions of Endoplasmic reticulum are:
- It is mainly responsible for the transportation of proteins and other carbohydrates to another organelle, which includes lysosomes, Golgi apparatus, plasma membrane, etc.
- They play a vital role in the formation of the skeletal framework.
- They provide the increased surface area for cellular reactions.
- They help in the formation of nuclear membrane during cell division.
- They play a vital role in the synthesis of proteins, lipids, glycogen and other steroids like cholesterol, progesterone, testosterone, etc.
Posted by Sourav Dash 7 years ago
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Posted by Gourav Dhakad 7 years ago
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Abhinav Kumar 7 years ago
Harsh Roy 7 years ago
Posted by Nandhitha Reddy 7 years ago
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Meghna Thapar 5 years, 6 months ago
Diatoms are unicellular algae that are well-known for the spectacular design of their cell walls. The di- atom cell wall is made of amorphous, hydrated silici- umdioxide (silica) which is associated with proteins and polysaccharides. A cell wall is a fairly rigid layer surrounding a cell located outside of the plasma membrane that provides additional support and protection. They are found in bacteria, archaea, fungi, plants, and algae. Animals and most other protists have cell membranes without surrounding cell walls.
Posted by Prince Kumar 7 years ago
- 5 answers
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Yash Patil 7 years ago
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