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Ask QuestionPosted by Smrutirekha Raul 5 years, 2 months ago
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Manas Bisay 5 years, 2 months ago
Posted by Basanagouda Patil 5 years, 2 months ago
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Yangzee Sherpa 5 years, 2 months ago
Yangzee Sherpa 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
.Organisms which can make their own food from simple substances are called autotrophs
The term “autotrophic” is formed by the combination of two terms, “auto” meaning self, and “trophic” meaning nutrition. The literal meaning of this term is self-nutrition.
The autotrophic organisms contain a green coloured pigment called chlorophyll which helps in trapping energy from the sun. All green plants possess an autotrophic mode of nutrition. They prepare their own food by utilizing solar energy, water, and carbon dioxide by the process of photosynthesis. This results in the formation of glucose.
Posted by Janhvi Mishra 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
Land breeze blows during the night from land to sea and the land becomes cooler faster than the sea. The air above the sea becomes less dense (i.e. warmer) and rises. The cooler air from the land moves in to take its place. Sea breeze: Sea breeze blows during the day and the land heats up faster than the sea. The land gets heated up by the heat radiated by the sun, much faster than the water during daytime. This heats up the air over the land and it expands and hence the hot air rises up and creates a vacuum. ... And hence the cool air moves from the land to the sea and is known as the land breeze.
Posted by . . 5 years, 2 months ago
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Yangzee Sherpa 5 years, 2 months ago
Neha Ramesh 5 years, 2 months ago
Posted by Kavinraj.G Raj 5 years, 2 months ago
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Posted by Jiya Soy 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
A Cyclone is a large scale air mass that rotates around strong centers of low pressure.
- Water vapors are formed when water is heated.
- This heat is released to atmosphere when water vapors convert to water during rains.
- The heat released, warms the air around and makes it to move up. This also results in decreased air pressure.
- Hence, cooler air from surrounding rushes to take the warm air’s place.
- This repeats till a low pressure system with surrounding high speed winds is created. This is called a Cyclone.
- Cyclone depends on wind speed, direction, temperature and humidity.
Cyclones are also called Hurricane in USA and Typhoon in Japan and Philippines
Posted by Sujal Belwal 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
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Manas Bisay 5 years, 2 months ago
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Smrutirekha Raul 5 years, 2 months ago
Posted by Varnika Parte 5 years, 2 months ago
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Posted by Janhvi Mishra 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
(i) Wind and air current.Wind :
Air that moves horizontally along the earth’s surface is called wind. The temperature and humidity varies in the wind system.
Air current: The vertical or nearly vertical movement of air is referred to as air current.
Posted by Peenuzzz Peenu 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
The caterpillars eat mulberry leaves till they get inside the cocoon or pupa . They eat it for 27-30 Days.
Posted by Madhavi Kumawat 5 years, 2 months ago
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Meghna Thapar 5 years, 2 months ago
Plasma is the liquid portion of blood. About 55% of our blood is plasma, and the remaining 45% are red blood cells, white blood cells and platelets that are suspended in the plasma. Plasma is about 92% water. Blood plasma is a yellowish liquid component of blood that holds the blood cells of whole blood in suspension. It is the liquid part of the blood that carries cells and proteins throughout the body. It makes up about 55% of the body's total blood volume. It is the intravascular fluid part of extracellular fluid.
Posted by Kaira Shinde 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Adaptations in Polar Bear
The polar bear is a large, white bear which lives in north polar regions of the earth. The polar bear feeds mainly on fish and seal.
1) Polar bear has white colour which matches with its surroundings: Due to white colour, polar bear is not visible easily in the snowy white background and hence its prey is unable to see it. This adaptation (of white colour) helps the polar bear to catch its prey. The white colour of polar bear also protects it from its predators.
2) Polar bear has two thick layers of fur on its body: This fur protects the polar bear from extreme cold by preventing the loss of heat from its body. Thus, the two thick layers of fur keep the polar bear warm in extremely cold climate. The polar bear has also fur on its feet and toes. This protects it from cold when it walks on snow and ice.
3) Polar bear has a thick layer of fat under its skin: This layer of fat insulates the body of polar bear against heat loss and keeps it warm in cold climate.
4) Polar bear has a rounded body and small ears to keep the body surface area to a minimum.This reduces the heat loss from the body of polar bear.
5) Polar bear has big feet (or big paws) to spread the weight of its body on snow which prevent it from sinking into snow and make it walk on snow easily. Polar bear has long, curved and sharp claws which help it to walk and run on slippery ice.
6) Polar bear is a good swimmer: The big feet (or big paws) help the polar bear to swim well. Being a fast swimmer helps the polar bear to catch its prey (like seal) in water very easily.
7) Polar bear has a very strong sense of smell: The very strong sense of smell helps the polar bear in locating and catching its prey for food.
Posted by Kaira Shinde 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
The birds which migrate from very cold regions to warmer regions in winter and go back after the winter is over, are called migratory birds. One of the most common migratory bird which comes to India every year for a few months is the Siberian crane.When winter sets in Siberia, and it gets extremely cold, the Siberian crane flies thousands of kilometres and comes to warmer places in India such as Bharatpur in Rajasthan , Sultanpur.The Siberian cranes fly back to Siberia when the winter ends there and climate becomes favourable.
The migratory birds usually fly high up in the sky where the wind flow is helpful and low temperature aids in dispersing the heat generated by the constant working of their flight muscles in flapping the wings.
Posted by Kaira Shinde 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
Adaptations in Penguins
Penguin is an animal which lives in extremely cold south polar region of the earth. Penguins hunt for fish which they eat as food.
1) Penguin is black and white in colour but still it merges well with the white background of ice and snow.
2) Penguin has thick skin and a layer of fat below its skin which protect it from extreme cold.
3) Penguins live together in large numbers. Penguins huddle together to keep themselves warm.
4) Penguin has streamlined body, flipper-like wings and webbed feet which make it a good swimmer.
Posted by Kaira Shinde 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
Adaptive Features Adapted by Elephants for Living in the Tropical Rainforest
- They have a strong sense of smell and uses its trunk for smell and to hold food.
- They also use their trunk to hold food.
- They have long ears which help them in keeping cool in hot and humid climate.
- Long ears help them in hearing very soft sound.
- They have thick padded feet which help them in moving silently.
Posted by Kaira Shinde 5 years, 2 months ago
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Gaurav Seth 5 years, 2 months ago
We find animals of certain kind living in particular climatic conditions because every living organism is adapted to live in the particular habitat. Every living thing develops their feature according to the area they live in.
For example, penguins have thick skin to protect themselves from cold and webbed feet to swim in water. It will not be able to survive in the hot climate of tropical regions as they developed thick skin for the protection from cold not from the hot and humid temperature.
Posted by Abhi Siri 5 years, 2 months ago
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Posted by Himani Mathur 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Himani Mathur 5 years, 2 months ago
Posted by Äđiƭɏå Kúmãr 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
| Bisexual flower | Unisexual flower |
| 1. It is also known as complete flower. | 1. It is also known as incomplete flower. |
| 2. It contains both male and female reproductive system. | 2. It contains either male or female reproductive system. |
| 3. E.g. Hibiscus | 3. E.g. Palm |
Posted by Dimple Vats 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Stamen is the male reproductive organ of the plant . The stamen is made of two parts: a filament and an anther. The stalk of stamen is called filament and the swollen top of stamen is called anther. Anther makes the pollen grains and stores them.
Posted by Shristi Singh 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Posted by Shreyan Bothra 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Refraction is the bending of a wave when it enters a medium where its speed is different. We can define it as the change in direction of a wave passing from one medium to another or from a gradual change in the medium.
Laws of refraction state that:
- The incident ray refracted ray, and the normal to the interface of two media at the point of incidence all lie on the same plane.
- The ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant. This is also known as Snell’s law of refraction.
sin i/sin r = constant
μ1 sin i = μ2 sin r
Posted by Moksh Antil 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Vidushi Malik 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
According to the question,
A rocket travels at a speed = 20,000 m/s
A rocket travels at a speed =20 ,000 × 18/5
= 4000× 18
= 72,000 km/h
Posted by Vinay.K Kunde 5 years, 2 months ago
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Posted by Palak J 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Yash Thorat 5 years, 2 months ago
Gaurav Seth 5 years, 2 months ago
The contamination of soil with waste materials (especially used polythene bags and plastics), pesticides, fertilisers, acid rain and industrial chemical wastes, etc., is called soil pollution.
The various sources of soil pollution and their effects are as follows:
1) Dumping of waste materials (such as polythene bags plastics, glass and metal objects) causes soil pollution. Some waste materials (like paper and vegetable wastes) rot after some time and become harmless. But the waste materials such as polythene bags and other plastics (plastic bottles, etc.) do not rot on their own and remain as such indefinitely. They also kill the living organisms.The used glass and metal objects also do not rot in nature and cause soil pollution.
2) The use of pesticides in agriculture causes soil pollution: Pesticides are the poisonous chemical substances which are sprayed on standing crops to save them from the harmful insects and diseases. So, the grains, fruits and vegetables grown in this polluted soil contain pesticides. When we eat such contaminated grains, fruits or vegetables, the pesticides present in them enter our bodies and damage our health in the long run.
3) The excessive use of fertilisers in agriculture causes soil pollution: Chemical fertilisers are added to soil in the fields to increase food production. The excessive use of chemical fertilisers makes the soil acidic or alkaline. When the soil becomes highly acidic or alkaline it is said to be polluted.This soil becomes unfit for the growth of crop plants.
4) Acid rain causes soil pollution: Acid rain makes the soil highly acidic. This acidic soil becomes toxic or poisonous) for plant growth. In this way, pollution caused by acid rain makes the soil less fertile.
5) Dumping of industrial wastes causes soil pollution: Many industries (or factories) dump their waste products containing harmful chemicals on soil. These chemicals cause soil pollution and harm plants which grow in it and the cattle which graze on it.
Posted by Aafiya Sadiq 5 years, 2 months ago
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Vidushi Malik 5 years, 2 months ago
Yogita Ingle 5 years, 2 months ago
Red blood cell, also called erythrocyte, cellular component of blood, millions of which in the circulation of vertebrates give the blood its characteristic colour and carry oxygen from the lungs to the tissues.
Posted by Aafiya Sadiq 5 years, 2 months ago
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Yogita Ingle 5 years, 2 months ago
Heartbeat
- The rhythmical contraction and expansion of heart muscles constitute heartbeat.
- Doctors check the heart beat with the help of a device called as stethoscope.
- Stethoscope has a chest piece, two ear pieces and a tube for joining the parts.
- Stethoscope amplifies the sound of the heart.
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Meghna Thapar 5 years, 2 months ago
The water requires heat when it changes from liquid to Vapour state. The water gives back heat when vapour condenses into liquid and a very low pressure area is created. This is how a thunderstorm becomes a cyclone. Cyclones are produced over the sea in tropical areas when the air is warm and humid. A cyclone is a natural calamity caused by a difference in air pressure in the atmosphere. ... They are associated with strong winds, heavy rains, and tidal waves. In tropical regions like India, thunderstorms are common, but very few thunderstorms become cyclones.
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