CBSE > Class 09 > Science | CBSE Board | Homework Help

Ask questions which are clear, concise and easy to understand.

Ask Question

Our nails are made up of cells

Posted by Lalit Kumar 3 years, 11 months ago

1 answers

Gaurav Seth 3 years, 11 months 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.

0Thank You

ANSWER

the slope of velocity-time graph gives

Posted by Sreekala Prashobh 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Roshani Pal 3 years, 11 months ago

Gives acceleration

0Thank You

Prince Pandey 3 years, 11 months ago

Speed of the body

0Thank You

ANSWER

How did newton guess the inverse square rule

Posted by Gopika.J ?? 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 3 years, 11 months 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.

0Thank You

ANSWER

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

Posted by Yukta Kasar 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Jai Ghosh 3 years, 11 months ago

Increase temperature increase rate of evaporation

0Thank You

Gopika.J ?? 3 years, 11 months 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.

0Thank You

ANSWER

How do you calculate density?

Posted by Shirish Patil 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 3 years, 11 months 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

0Thank You

ANSWER

When do things move faster? Day or night?

Posted by Shirish Patil 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Pavleen Bagga 3 years, 11 months ago

At night, the air is denser due to humidity .Sound requires medium to travel and do denser the medium, faster the sound travels . Humid air is denser than warmer air as in day.

0Thank You

ANSWER

Explain the cross section of dicot stem.

Posted by K Keerthana Reddy 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 3 years, 11 months 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.

1Thank You

ANSWER

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

Posted by Priyadarshee Omm 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Shirish Patil 3 years, 11 months ago

0Thank You

ANSWER

What is average velocity . Explain with suitable example

Posted by Devansh Dixit 3 years, 11 months ago

CBSE > Class 09 > Science

3 answers

Siddhi Aher 3 years, 11 months ago

Average velocity=Total displacement/total time taken

0Thank You

Yogita Ingle 3 years, 11 months 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.

0Thank You

Suchitra Sen 3 years, 11 months ago

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

0Thank You

ANSWER

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

Posted by Umaiyal Shree 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Pavleen Bagga 3 years, 11 months ago

Stannic

0Thank You

ANSWER

Difference between simple permanent tissue and complex tissue

Posted by Harshit Mehroliya 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 3 years, 11 months 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

0Thank You

Harshit Mehroliya 3 years, 11 months ago

Difference between simple permanent tissue and complex tissue

1Thank You

ANSWER

Name two simple permanent tissue besides parenchyma tisuuse

Posted by Md Junaid 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Silent King 3 years, 11 months ago

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

0Thank You

Yogita Ingle 3 years, 11 months ago

Simple permanent tissues
- epidermis
- parenchyma
- collenchyma
- sclerenchyma

0Thank You

ANSWER

Chootki ya clinically proven ha

Posted by Saksham Sharma 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Gopika.J ?? 3 years, 11 months 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.

0Thank You

ANSWER

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

Posted by Devansh Dixit 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 3 years, 11 months 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.

1Thank You

ANSWER

Name S.I unit of impluse

Posted by Ekta Sharma 3 years, 11 months ago

CBSE > Class 09 > Science

5 answers

Md Junaid 3 years, 11 months ago

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

1Thank You

Rudranshu Mishra 3 years, 11 months ago

Newton ×Second.

2Thank You

Vivek Yadav 3 years, 11 months ago

Newton second

2Thank You

Yogita Ingle 3 years, 11 months ago

The SI unit of impulse is the newton second .

1Thank You

Ayush Maurya 3 years, 11 months ago

N s

1Thank You

ANSWER

What is global warming short definition?

Posted by Moksha Sahu 3 years, 11 months ago

CBSE > Class 09 > Science

5 answers

K Keerthana Reddy 3 years, 11 months ago

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

1Thank You

Ayush Maurya 3 years, 11 months ago

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

2Thank You

Yogita Ingle 3 years, 11 months 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.

1Thank You

Neeraja D 3 years, 11 months 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

1Thank You

Janya Soni 3 years, 11 months ago

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

1Thank You

ANSWER

What is binomial nomenclature?

Posted by Samiksha Singaraj 💫 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Samiksha Singaraj 💫 3 years, 11 months ago

Thank you for your answer friend ?

2Thank You

Gaurav Seth 3 years, 11 months 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.

1Thank You

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 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Ayush Maurya 3 years, 11 months ago

a)4r b)0 c)2r√2

1Thank You

Gaurav Seth 3 years, 11 months 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.

1Thank You

ANSWER

Differentiate between plant and animal cell

Posted by Anushka Kumari 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Samiksha Singaraj 💫 3 years, 11 months 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.

0Thank You

ANSWER

What are the functions of cytoplasm

Posted by Ankit Kumar 3 years, 11 months ago

CBSE > Class 09 > Science

4 answers

Lalit Kumar 3 years, 11 months 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

1Thank You

Devansh Dixit 3 years, 11 months 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.

2Thank You

Samiksha Singaraj 💫 3 years, 11 months 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.

2Thank You

Manyata Joshi 3 years, 11 months ago

2Thank You

ANSWER

Depletion of ozone layer?

Posted by Moksha Sahu 3 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 3 years, 11 months 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.

2Thank You

ANSWER

What is the Diameter of atom of hydrogen

Posted by Mohit Chauhan 3 years, 11 months ago

CBSE > Class 09 > Science

4 answers

Mohit Chauhan 3 years, 11 months ago

120 pm correct

0Thank You

Ayush Maurya 3 years, 11 months ago

0.074 nm

0Thank You

Jatin Jadam 3 years, 11 months ago

120 pm

1Thank You

Naman Verma 3 years, 11 months ago

Pta nhi

0Thank You

ANSWER

What is sublimation? Give example .

Posted by Rishika Vijapure 3 years, 11 months ago

CBSE > Class 09 > Science

5 answers

Divanshi Yadav 3 years, 11 months ago

Sublimation is when a solidd change his state to gaseous state

1Thank You

Arti Kumari 3 years, 11 months 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.

1Thank You

Yogita Ingle 3 years, 11 months 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.

2Thank You

Samruddhi Khonde 3 years, 11 months ago

Most common example is camphor and dry ice

1Thank You

Vinay Khatri 3 years, 11 months ago

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

2Thank You

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 3 years, 11 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is Harvesian System in mammalian

Posted by Mehnaz Begum 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Arti Kumari 3 years, 11 months 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.

0Thank You

Yogita Ingle 3 years, 11 months 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.

1Thank You

ANSWER

What is lightest gas

Posted by Anurag Singh 3 years, 11 months ago

CBSE > Class 09 > Science

5 answers

Sachin Kumar 3 years, 11 months ago

Hydrogen

0Thank You

Ayush Maurya 3 years, 11 months ago

Hydrogen

0Thank You

Jatin Jadam 3 years, 11 months ago

Hydrogen

0Thank You

Divanshi Yadav 3 years, 11 months ago

Hydrogen

0Thank You

Satyajeet Paswan 3 years, 11 months ago

Hydrogen. What's your school name.??

0Thank You

ANSWER

What is sound and how is its produced?

Posted by Nishant Singh 3 years, 11 months ago

CBSE > Class 09 > Science

3 answers

Divanshi Yadav 3 years, 11 months ago

Sound is produced throw vibration? in air to medium to another air medium and sound is a form of engery

0Thank You

Chandra Kant 3 years, 11 months ago

How its produced_there has to be vibration to produce sound and if we vibrate anything it will produce sound and a particle will disturb and this sound I will reach at you and you can hear it

2Thank You

Chandra Kant 3 years, 11 months ago

In simple words we can say it's a form of energy which enables us to hear

1Thank You

ANSWER

What happen : When RBCs are kept in concentrated solution.

Posted by Suchitra Sen 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Suchitra Sen 3 years, 11 months ago

Thanks it helps me a lott?

3Thank You

M U 3 years, 11 months ago

When RBC is kept in concentrated solution,RBC will shrink. As the concentration of solute in the solution outside the cell is higher, water moves outside the cytoplasm and the cell membrane shrinks. This process of shrinkage of plasma membrane in presence of concentrated solution is known as plasmolysis .................. I hope it helps!! ?

2Thank You

ANSWER

Define uniform motion.

Posted by Samskruthi .T.M 3 years, 11 months ago

CBSE > Class 09 > Science

5 answers

M U 3 years, 11 months ago

A body is said to be in uniform motion if it travels equal distances in equal intervals of time, no matter how small these time intervals may be. If we draw distance time graph for uniform motion then it will be straight line. ................ I hope It helps!!! ?

0Thank You

Navya. Kanwar 3 years, 11 months ago

A body travels equal distance in equal intervals of time is called uniform motion ??????????????????⚠️???⚠️??↩???????????????????????????????

1Thank You

Sania Khan 3 years, 11 months ago

0Thank You

Gaurav Seth 3 years, 11 months ago

As the object covers equal distances in equal intervals of time, it is said to be in uniform motion.

Example- Motion of planets around Sun, they revolve at a constant speed. So the distance travelled in every equal time period is equal

0Thank You

Pawanjeet Kaur 3 years, 11 months ago

0Thank You

ANSWER

Name the different types of plant tissue and human body

Posted by Nagaraj Sangannavar 3 years, 11 months ago

CBSE > Class 09 > Science

2 answers

M U 3 years, 11 months ago

In plant anatomy, tissues are categorized broadly into three tissue systems: the epidermis, the ground tissue, and the vascular tissue. Epidermis - Cells forming the outer surface of the leaves and of the young plant body. ... Simple Permanent tissues Parenchyma. Collenchyma. Sclerenchyma. I hope it helps?!!!?

0Thank You

Gaurav Seth 3 years, 11 months ago

Based on the dividing capacity of the tissues, various plant tissues can be classified as growing or meristematic tissue and permanent tissue which have further sub-divisions as explained below: