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Yogita Ingle 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.

ANSWER

What is soil pollution and what is causes of soil pollution ?

Posted by Moksha Sahu 3 hours ago

CBSE > Class 09 > Science

2 answers

Piyush Sharma 3 hours ago

Excessive and inefficient usage of fertilizer

Yogita Ingle 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,

Improper disposal of industrial waste: industries are believed to be one of the leading causes of soil pollution due to improper management and disposal of the toxic wastes generated during industrial activities.
Excessive and inefficient usage of pesticides and fertilizers: the agriculture industry makes extensive use of chemical fertilizers and pesticides for the growth and maintenance of crops. However, excessive and inefficient use of these toxic chemicals can seriously contaminate the soil.
Petroleum or diesel spills: leaks in fuel transportation pipes can cause fuel spills. These fuels are known to contain toxic hydrocarbons which can cause soil contamination.

ANSWER

Why we don't use the term diffusion for the movement of water inside or outside why we use another term osmosis

Posted by Pragati Upadhyay 6 hours ago

CBSE > Class 09 > Science

1 answers

Amrita Pradeep 2 hours ago

Diffusion is the process of movement of a solid, liquid or gas from a region of high concentration to a region of lower concentration. If the nature of the substance undergoing the process is specified as a liquid, then the term used should be osmosis.

ANSWER

what is thermadynamics

Posted by Prinshu Kumar 7 hours ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 6 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.

ANSWER

Our nails are made up of cells

Posted by Sandeep Kumar 7 hours ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 4 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.

ANSWER

the slope of velocity-time graph gives

Posted by Sreekala Prashobh 17 hours ago

CBSE > Class 09 > Science

1 answers

Prince Pandey 3 hours ago

Speed of the body

ANSWER

How did newton guess the inverse square rule

Posted by Gopika.J 😍😍 17 hours ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 15 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.

ANSWER

Why do wet clothes dry quickly in the sun than in the shades

Posted by Yukta Kasar 18 hours ago

CBSE > Class 09 > Science

1 answers

Gopika.J 😍😍 17 hours ago

The heat of sun causes evaporation of water from the wet clothes more rapidly than the evaporation in shade. Due to this; wet clothes dry up quickly in sun than in shade.

ANSWER

How do you calculate density?

Posted by Shirish Patil 18 hours ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 16 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

ANSWER

When do things move faster? Day or night?

Posted by Shirish Patil 18 hours ago

CBSE > Class 09 > Science

0 answers

ANSWER

Explain the cross section of dicot stem.

Posted by K Keerthana Reddy 21 hours ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 20 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.

ANSWER

Class ix science 1 st chapter Intext all question's answer.

Posted by Priyadarshee Omm 22 hours ago

CBSE > Class 09 > Science

1 answers

Shirish Patil 18 hours ago

🤣

ANSWER

What is average velocity . Explain with suitable example

Posted by Devansh Dixit 22 hours ago

CBSE > Class 09 > Science

3 answers

Siddhi Aher 19 hours ago

Average velocity=Total displacement/total time taken

Yogita Ingle 21 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.

Suchitra Kashyap 21 hours ago

The average velocity is defined as the total displacement of a body divided by its total time.

ANSWER

The cation which is tetravalent is (a) stannic (b) ferric (c) stannous (d) silver.

Posted by Umaiyaal Shree 1 day ago

CBSE > Class 09 > Science

0 answers

ANSWER

write two points of different between tendon and ligament

Posted by Nehal Patel 1 day, 2 hours ago

CBSE > Class 09 > Science

3 answers

Siddhi Aher 19 hours ago

Tendons 1.This type of connective tissue connects muscle to bones 2. It's a fibrous tissue which has limited flexibility Ligaments 1.This type of connective tissue connects bone to bone. 2.its fibrous ,elastic,and more flexible than a tendon

Sania Khan 23 hours ago

tendon is a fibrous connective tissue which attaches muscle to bone. Tendons may also attach muscles to structures such as the eyeball. ... A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.

Mamta Joshi 1 day, 2 hours ago

A tendon is a fibrous connective tissue which attaches muscle to bone. Tendons may also attach muscles to structures such as the eyeball. ... A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.

5Thank You

ANSWER

Difference between simple permanent tissue and complex tissue

Posted by Harshit Mehroliya 1 day, 4 hours ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 1 day, 4 hours ago

Simple Tissues	Complex Tissues
Nature of the Tissue
Homogenous	Heterogenous
Example
Parenchyma, Collenchyma, Sclerenchyma	Xylem, phloem
Function
Repair of tissue, food storage, secretion, and structural support	Conduction of minerals and water to various parts of the plant body
Distribution
Located in every part of the plant	Primarily located in the vascular regions
Cell Composition
Composed of a single type of cell/ all cells perform a similar function	Composed of various types of cells that perform various functions

Harshit Mehroliya 1 day, 4 hours ago

Difference between simple permanent tissue and complex tissue

ANSWER

Name two simple permanent tissue besides parenchyma tisuuse

Posted by Md Junaid 1 day, 10 hours ago

CBSE > Class 09 > Science

2 answers

Silent King 1 day, 5 hours ago

Simple permanent tissues are ~ •Parenchyma •Collenchyma •Scarenchyma •Epidermis •Cork

Yogita Ingle 1 day, 7 hours ago

Simple permanent tissues
- epidermis
- parenchyma
- collenchyma
- sclerenchyma

ANSWER

Chootki ya clinically proven ha

Posted by Rachna Sharma 1 day, 18 hours ago

CBSE > Class 09 > Science

1 answers

Gopika.J 😍😍 17 hours ago

It is hard to make antiviral medicines because viruses have a high tendency to reproduce rapidly and virus don't have their own cell structure and use the host cell to replicate.

ANSWER

find the numerical ratio of distance to displacement for a moving object

Posted by Devansh Dixit 1 day, 18 hours ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 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.

ANSWER

Name S.I unit of impluse

Posted by Ekta Sharma 1 day, 19 hours ago

CBSE > Class 09 > Science

5 answers

Md Junaid 1 day, 9 hours ago

Impulse Is change in momentum. Hence the si unit of impulse is N.s Newton second

Rudranshu Mishra 1 day, 15 hours ago

Newton ×Second.

Vivek Yadav 1 day, 18 hours ago

Newton second

Yogita Ingle 1 day, 18 hours ago

The SI unit of impulse is the newton second .

Ayush Maurya 1 day, 19 hours ago

N s

ANSWER

What is global warming short definition?

Posted by Moksha Sahu 1 day, 22 hours ago

CBSE > Class 09 > Science

5 answers

K Keerthana Reddy 21 hours ago

Global warming is the process by which ice melts due to the increase in Earth's temperature.

Ayush Maurya 1 day, 18 hours ago

It is increase in earth's temperature due to green house gases like CO2 ,CH4

Yogita Ingle 1 day, 19 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.

Akshara Dilip 1 day, 20 hours ago

Golbal warmingwe occurs when carbon dioxide (CO2) and other air pollutants and green house gases collect in the atomsphere and absorb sunlight and solar radiation that have bounced off the earths surface

Janya Soni 1 day, 20 hours ago

Increased concentration of carbon dioxide in the air is called global warming

ANSWER

What is binomial nomenclature?

Posted by Samiksha Singaraj 💫 1 day, 22 hours ago

CBSE > Class 09 > Science

2 answers

Samiksha Singaraj 💫 1 day, 21 hours ago

Thank you for your answer friend 👍

Gaurav Seth 1 day, 22 hours ago

Answer:
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.

ANSWER

a body is moving along a circular path of radius 2r. what is the distance traveled and displacement of the body when it completes - (a) half revolution (b) complete revolution (c) one and half (d) one and quarter

Posted by Devansh Dixit 1 day, 23 hours ago

CBSE > Class 09 > Science

2 answers

Ayush Maurya 1 day, 18 hours ago

a)4r b)0 c)2r√2

Gaurav Seth 1 day, 22 hours ago

(a)

ANSWER

Displacement is the shortest distance travelled from the initial point to the final point. After half revolution the displacement is the length of the diameter which is equal to 2r. Hence the displacement is 2r.

ANSWER

Differentiate between plant and animal cell

Posted by Anushka Kumari 1 day, 23 hours ago

CBSE > Class 09 > Science

1 answers

Samiksha Singaraj 💫 1 day, 22 hours ago

Plant cell: 1. Cell wall is present in plant cell. 2. Vacuoles are larger in plant cell. 3. Usually Plant cell is larger than animal 4. Plastids are present in plant cell. Animal cell: 1. Cell wall is absent in animal cell. 2. Vacuoles are smaller in animal cell. 3. Usually animal is smaller than plant cell. 4. Plastids are absent in animal cell.

ANSWER

What are the functions of cytoplasm

Posted by Ankit Kumar 2 days, 2 hours ago

CBSE > Class 09 > Science

4 answers

Sandeep Kumar 7 hours ago

Cyroplasm is a jelly like structure present between the cell membrane and the nucleus it helps in transfer of genes from the parents to the off springs

Devansh Dixit 7 hours ago

The cytoplasm provides a medium for the organelles to remain suspended. The cytoplasm acts as a buffer and protects the genetic material of the cell and also the cellular organelles from damage caused due to movement and collision with other cells. Cellular respiration begins in the cytoplasm with glycolysis.The jelly-like fluid of the cytoplasm is composed of salt and water and is present within the membrane of the cells and embeds all of the parts of the cells and organelles. The cytoplasm is home to many activities of the cell as it contains molecules, enzymes that are crucial in the break down of the waste.

Samiksha Singaraj 💫 7 hours ago

Cytoplasm is a jelly like structure present between the cell wall and the cell membrane. It helps in transfer of genes from the parents to the off spring.

Mamta Joshi 2 days ago

ANSWER

Depletion of ozone layer?

Posted by Moksha Sahu 2 days, 3 hours ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 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.

ANSWER

What is the Diameter of atom of hydrogen

Posted by Mohit Chauhan 2 days, 3 hours ago

CBSE > Class 09 > Science

4 answers

Mohit Chauhan 1 day ago

120 pm correct

Ayush Maurya 1 day, 18 hours ago

0.074 nm

Jatin Jadam 2 days, 3 hours ago

120 pm

Naman Verma 2 days, 3 hours ago

Pta nhi

ANSWER

What is sublimation? Give example .

Posted by Rishika Vijapure 2 days, 16 hours ago

CBSE > Class 09 > Science

5 answers

Divanshi Yadav 2 days, 5 hours ago

Sublimation is when a solidd change his state to gaseous state

Arti Kumari 2 days, 6 hours ago

Sublimation, including melting, freezing, and evaporation, is a form of phase transition, or shift in a state of matter. A substance transforms from a solid to a gas by sublimation without ever going through a liquid phase. A common example of sublimation is the dry ice, heavy CO2.

Yogita Ingle 2 days, 7 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.

Samruddhi ✌✌ 2 days, 8 hours ago

Most common example is camphor and dry ice

Nishant Khatri 2 days, 15 hours ago

The conversion of solid into air without converting into water 💦 Eg. Naptholen balls

ANSWER

Can you give your no. I can send a image 🖼 and you seen the image. Because this is very hard question. Question in image from.

Posted by Satyajeet Paswan 2 days, 16 hours ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is Harvesian System in mammalian

Posted by Mehnaz Begum 2 days, 17 hours ago

CBSE > Class 09 > Science

2 answers

Arti Kumari 2 days, 6 hours ago

Haversian system : A haversian canal, its lamellae and osteocytes form a haversian system. Haversian canals are found in bone matrix of long bone, like humerus of mammals. Haversian canals contain artery and veins, osteoblasts in areolar tissue, nerves and lymph. It is also called osteon.

Yogita Ingle 2 days, 7 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.