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Ask QuestionPosted by A K Bihari 5 years, 4 months ago
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Posted by Bal Yugeshwar Ray 5 years, 4 months ago
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Ritik Varshney 5 years, 4 months ago
Posted by Devil Pandit ? 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
- Vacuoles are fluid filled organelles surrounded by a membrane.
- Animal cells have small sized vacuoles whereas plant cells have large vacuoles.
- It provides turbidity and rigidity to the plant cell.
- It acts as storage sacs of cell and stores food, water, sugar, minerals and waste products of the cell.
Posted by Devil Pandit ? 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
The positive impacts of the Green Revolution are as follows: 1. The use of High Yield Variety seeds led to a substantial increase in the agricultural produce which helped our country in becoming self-sufficient in terms of availability of food grains. 2. The Green Revolution helped in increasing the economic conditions of all farmers (big as well as small) by ensuring improved production by the use of HYV seeds, fertilizers, pesticides and improved agricultural techniques. The negative impacts of the Green revolution are as follows:
1.The Green Revolution required a lot of water for irrigation purposes which shows unequal benefits derived by farmers belonging to different regions of our country.
2. The increased use of water resulted in lowering of ground water level in many regions.
3. The increased use of pesticides led to contamination of water and soil.
Posted by Atul Kumar Khemundu 5 years, 4 months ago
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Meghna Thapar 5 years, 3 months ago
Fusion is the process that powers the sun and the stars. It is the reaction in which two atoms of hydrogen combine together, or fuse, to form an atom of helium. In the process some of the mass of the hydrogen is converted into energy.
Posted by Tanushree & Anushree Dutta 5 years, 4 months ago
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Posted by Tanushree & Anushree Dutta 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
S= 1/2(u+v)×t
Now, since t = (v – u)/ a
The above equation can be written as:
S= 1/2(u+v)×(v-u)/a
Rearranging the equation, we get
S= 1/2(v+u)×(v-u)/a
S = (v2-u2)/2a
Third equation of motion is obtained by solving the above equation:
v2 = u2+2aS
Yogita Ingle 5 years, 4 months ago
(i) It is known that the acceleration (a) of the body is defined as the rate of change of velocity.
So, the acceleration can be written as:
a = v − ut
From this, rearranging the terms, the first equation of motion is obtained, which is:
v = u + at
:
Posted by Pushprajsinh Rathod 5 years, 4 months ago
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Posted by Amith Keshav 5 years, 4 months ago
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Tanushree & Anushree Dutta 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
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Cell membrane |
Cell wall |
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It is present in all cells. |
It is present in bacteria, fungi and plant cells. It is absent in animal cells and protozoans. |
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The cell membrane is also known as the plasma membrane or plasmalemma. |
There is no other name for the cell wall. |
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Cell membrane is semi-permeable. |
Cell wall is completely permeable. |
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Cell membrane is made up of lipids and proteins. |
Cell wall is made up of cellulose. (The composition of the cell wall is different in prokaryotic cell.) |
Posted by Swagat Panda 5 years, 4 months ago
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Posted by Akshit Singh 5 years, 4 months ago
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Meghna Thapar 5 years, 3 months ago
After the seed has made it to a new location and is covered with dirt, it can begin germination. Germination is the process of seeds developing into new plants. First, environmental conditions must trigger the seed to grow. Usually, this is determined by how deep the seed is planted, water availability, and temperature. When water is plentiful, the seed fills with water in a process called imbibition. The water activates special proteins, called enzymes, that begin the process of seed growth. First the seed grows a root to access water underground. Next, the shoots, or growth above ground, begin to appear. The seed sends a shoot towards the surface, where it will grow leaves to harvest energy from the sun. The leaves continue to grow towards the light source in a process called photomorphogenesis.
Posted by Meghana Bhimer 5 years, 4 months ago
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Ritik Varshney 5 years, 4 months ago
Mansi Mujage 5 years, 4 months ago
Posted by Sandeep Singla 5 years, 4 months ago
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Tushar Dhaka 5 years, 4 months ago
Posted by Raju Singh 5 years, 4 months ago
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Meghna Thapar 5 years, 3 months ago
Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is. Earth's gravity comes from all its mass. The strength of the gravitational force between two objects depends on two factors, mass and distance. the force of gravity the masses exert on each other increases, the force of gravity decreases. If the distance is doubled, the force of gravity is one-fourth as strong as before. It extends as far away in light-years as the earth is old. And farther, if you include the various things that eventually coalesced into the earth. So the earth's gravitational field is approximately a sphere about 4.5 billion light-years in radius.
Posted by Sushmita Pandey 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
We feel comfortable in fan because it evaporates water from our body.
We get perspiration or sweating because our body tries to cool ourselves by releasing (water) sweat through the pores of our skin. And how when we sit under a fan, the sweat of our body evaporates, due to directed air upon us, making our body cool.
Posted by Harman Deep Kour 5 years, 4 months ago
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Posted by Swagat Panda 5 years, 4 months ago
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Gaurav Seth 5 years, 4 months ago
Activity 1.1 asks us to dissolve some amount of salt in water and observe the change in the volume.
Observation:
There is no change in the volume of water.
Explanation:
A water molecule consists of hydrogen and oxygen atom. Between hydrogen and oxygen, there are large empty spaces. We call these empty spaces a Void. When we add salt to the water, it goes into that void. As a result, we do not see any change in volume.
Further explanation by example:
You can compare water like a sponge. There are a lot of empty spaces in them. Any smaller substance takes those space without changing the shape or volume of sponge.
Related Facts:
- Solubility in water depends on this feature. If a particle can sit in those spaces, the object is soluble. If the particle cannot accommodate in those voids, they do not dissolve and settle to the bottom.
- Change in volume is not constant after adding too much salt. After a certain point, the salt molecule fills all the empty voids. Now there is no space for any other salt molecule. Beyond this stage, salts deposit on the bottom and volume of water increases. We call this stage a Saturation point. The saturation point of a substance is fixed for a particular liquid. For example, the saturation point of salt at room temperature in the water is 357 gm/litre.
Swagat Panda 5 years, 4 months ago
Posted by Namsha Maden 5 years, 4 months ago
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Gaurav Seth 5 years, 4 months ago
Prokaryotes
a. These organisms do not have well defined nucleus, do not have nuclear membrane. Chromosomes are circular.
b. All cell organelles are absent
Eukaryotes
a. These are organisms have well-defined nucleus with nuclear membrane. Chromosomes are linear.
b. All cell organelles are present.
Akash ? 5 years, 4 months ago
Posted by Rachna Patel 5 years, 4 months ago
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Posted by Pratik Thorat 5 years, 4 months ago
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Posted by Hæçķəŕ 894 5 years, 4 months ago
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Meghna Thapar 5 years, 3 months ago
Frayne moved to London in 2004 to build a career in magic, and his plan was to create the first ever 'magic mix-tape'. He set out with a small team to film his performances on the streets of London and backstage at events, after he had been permitted entry by impressing doormen and tour managers. Steven Frayne, who goes by his stage name Dynamo, is a new shining star in the world of magic. The English magician does all from elegant card tricks to epic stunts like levitation and walking on water. His show Dynamo: Magician Impossible has received many awards and has been highly critically acclaimed.
Posted by Hæçķəŕ 894 5 years, 4 months ago
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Kelvin Sharma 5 years, 4 months ago
Posted by Umesh Joshi 5 years, 4 months ago
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Umesh Joshi 5 years, 3 months ago
Posted by Ghar Singh 5 years, 4 months ago
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Priya Singh 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
Anything which occupies space and has mass is called matter. . Food, water, air, clothes, table, chair, plants and trees. Indian philosophers said that all the matter living or non-living, was made up of five basic elements air, earth, fire, sky and water. On the basis of its physical properties and on the basis of its chemical properties. On the basis of chemical properties the matter is classified as elements, compounds and mixtures.
Posted by Satwik Banerjee 5 years, 4 months ago
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Priya Singh 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
Cells are the structural and functional units of life. A cell is capable of independent existence and can carry out all the vital functions for living. A cell carries out nutrition, respiration, excretion, transportation and reproduction; the way an individual organism does. Unicellular organisms are capable of independent existence which shows a cell’s capability to exist independently. Due to this, a cell is called the fundamental and structural unit of life. All living beings are composed of the basic unit of life, i.e. cell.
Cells also need to manage a wide range of functions like growing and moving. In order to carry out all these things, cells need energy. The main energy source for most cells to function is ATP.
Posted by Yashobanti Sunari 5 years, 4 months ago
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Yogita Ingle 5 years, 4 months ago
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PLANT TISSUES |
ANIMAL TISSUES |
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Posted by Gangamma Slv 5 years, 4 months ago
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Priya Singh 5 years, 4 months ago
Posted by Divyanshu Mishra 5 years, 4 months ago
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Priya Singh 5 years, 4 months ago
Posted by Bhagwan Singh Sevniya 5 years, 4 months ago
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Kelvin Sharma 5 years, 4 months ago
Yogita Ingle 5 years, 4 months ago
The mass per unit volume of a substance is called density (density = mass/volume). As the volume of a substance increases, its density decreases.
Liquids have lower density than that of solids. Water is also a liquid so it should also have less density than that of solid that is ice.
Though ice is a solid, but it has a cage like structure hence there are large number of empty spaces between its particles. These spaces are larger as compared to the spaces present between the particles of water. Thus for a given mass of water, volume of ice is greater than that of water. Hence, the density of ice is less than that of water. A substance with lower density than water can float on water. Therefore, ice floats on water.
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Preeti Sharma 5 years, 4 months ago
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