Posted by Ritu Gupta 2 hours ago
CFCs contain both chlorine and fluorine. CFCs are very stable and do not get degraded by any natural process. In the ozone layer present in the outer region of the atmosphere (25-40 km above sea level), CFCs are dissociated by ultraviolet light to release free chlorine atoms. Free chlorine atoms catalyse the breakdown of ozone molecules (03) into oxygen. This results in degradation of the ozone layer. Thinning of the ozone layer would allow penetration of ultraviolet light into Earth’s atmosphere causing blindness, skin cancer and mutations.
Posted by Moksha Sahu 3 hours ago
Soil pollution refers to the contamination of soil with anomalous concentrations of toxic substances. It is a serious environmental concern since it harbours many health hazards. For example, exposure to soil containing high concentrations of benzene increases the risk of contracting leukaemia.
Some common causes of soil pollution are listed below,
Posted by Pragati Upadhyay 6 hours ago
Posted by Prinshu Kumar 7 hours ago
The branch which deals with the movement of energy from one form to the other and the relation between heat and temperature with energy and work done is called as thermodynamics. In other terms we can define thermodynamics as the science stream that deals with the study of the combined effects of heat and work on the changes of state of matter confined by the laws of thermodynamics. Chemical reactions which releases heat energy associated with it are converted into different usable forms based on the laws of thermodynamics. The fact that energy can only be transformed from one form to the other forms and its use in different industries is on the basis of energy transformation. We are aware that chemical reactions have energy associated with it. The laws of thermodynamics deal with energy changes during a reaction and are not concerned with the rate at which the reaction is proceeding.
Posted by Sandeep Kumar 7 hours ago
Your nails are made of keratin. Keratin is a type of protein that forms the cells that make up the tissue in nails and other parts of your body. Keratin plays an important role in nail health.
Posted by Gopika.J 😍😍 17 hours ago
Newton used Kepler's third law of planetary motion to guess how the force of gravitation of the earth is weakened by distance. Suppose a planet revolves around the sun in a circular orbit of radius r with speed v, then the force acting on the planet is given by
If T is the period of revolution of the planet around the sun, then its orbital velocity will be
This is inverse-square rule for the force of gravitation. According to this rule, 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 Yukta Kasar 18 hours ago
Posted by Shirish Patil 18 hours ago
Density, mass and volume are all related by the formula,
d = V/m
where dd is density, VV is volume, and mm is mass. This can be rearranged in order to find volume or mass depending on which quantities you are given and what the question asks you to find.
Mass is normally measured in grams, g, or kilograms, kg, whereas, volume is normally measured in cubic centimetres, cm3, or cubic metres, m3.
This means when dividing mass by volume, the resulting units are typically grams per cubic centimetre (g/cm3), or kilograms per cubic metre (kg/cm3). These are compound units
Posted by K Keerthana Reddy 21 hours ago
Cross-section of the dicot stem:
Dicotyledons or dicot is generally referred to the flowering plants or angiosperms in which the seeds typically contain two embryonic leaves or cotyledon. All legumes such as beans, lentils, pea, and peanuts are examples of dicotyledons. There are around 1.0 – 1.5 lakh species of dicot plants.
Posted by Devansh Dixit 22 hours ago
The average velocity of a body in a certain time interval is given as the displacement of the body in that time interval divided by time.
Posted by Nehal Patel 1 day, 2 hours ago
Posted by Harshit Mehroliya 1 day, 4 hours ago
Nature of the Tissue
|Parenchyma, Collenchyma, Sclerenchyma||Xylem, phloem|
|Repair of tissue, food storage, secretion, and structural support||Conduction of minerals and water to various parts of the plant body|
|Located in every part of the plant||Primarily located in the vascular regions|
|Composed of a single type of cell/ all cells perform a similar function||Composed of various types of cells that perform various functions|
Posted by Md Junaid 1 day, 10 hours ago
Posted by Rachna Sharma 1 day, 18 hours ago
Posted by Devansh Dixit 1 day, 18 hours ago
We know, magnitude of displacement is the straight line distance between the initial and final point of the path of a moving body.
Displacement can be positive, negative or zero.
While distance travelled is always positive or zero when there is no motion.
So the ratio of displacement to distance is always equal to or less than 1.
Posted by Ekta Sharma 1 day, 19 hours ago
Posted by Moksha Sahu 1 day, 22 hours ago
Global warming is a gradual increase in the earth’s temperature generally due to the greenhouse effect caused by increased levels of carbon dioxide, CFCs, and other pollutants.
Posted by Samiksha Singaraj 💫 1 day, 22 hours ago
In binomial nomenclature, name of every organism is composed of two components—the first one is generic (genus) and the second one is specific (species). Also, the generic name starts with a capital letter whereas the specific name starts with small letter. For example, the scientific name of man is “Homo sapiens”. Here “Homo” is the generic and “sapiens” is the specific name.
Posted by Devansh Dixit 1 day, 23 hours ago
Posted by Anushka Kumari 1 day, 23 hours ago
Posted by Ankit Kumar 2 days, 2 hours ago
Posted by Moksha Sahu 2 days, 3 hours ago
The decrease in the quantity of ozone in the upper layer of the atmosphere is called depletion of ozone. This is also known as the ozone hole. Due to this hole, ultraviolet rays of the Sun can reach the Earth and cause diseases such as skin cancer.
Pollutants such as oxides of nitrogen, chlorine free radicals etc. are produced in the atmosphere. Molecules of ozone react with these pollutants and are destroyed. This causes depletion of the ozone layer.
Posted by Rishika Vijapure 2 days, 16 hours ago
The phenomenon of change of solid directly to gas or conversion of gas directly to liquid without changing into liquid state is called sublimation. For instance, camphor also called capoor when kept for a long time vanishes. This is due to the sublimation of camphor.
Posted by Satyajeet Paswan 2 days, 16 hours ago
Posted by Mehnaz Begum 2 days, 17 hours ago
The Haversian canal contains small blood vessels responsible for the blood supply to osteocytes (individual bone cells). A Haversian canal and its lamellae and osteocytes form a Haversian system. The lamellae between Haversian system is called as interstitial lamellae. The Haversian canals are interconnected by transverse channels termed as the Volkmann's canals. Haversian systems are absent in spongy bones of mammals.
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