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

Vaccine are right to be used for protection against potential future infection. Vaccines are designed to induce a relative immune response in your body. Antibiotics are effective for stopping the reproduction process of bacteria and do not have any effect on viruses. These are also not to be used for preparing for potential future ☺️ infection,but rather for when ther is a currant bacterial infections.

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A ball is thrown vertically upwards with a velocity of 5 m/s. Calculate the maximum height reached by the ball.

Posted by Arjun Suresh 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Iqra Siddique Siddique 4 years, 6 months ago

u=5m/s, v=o, g=-10m/s, h=? According to the third equation of motion, 2gh=v^2-u^2 2×(-10)×h=0^2-5^2 -20h=25 h=25/20 h=1.25m

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Define the term "tissue"

Posted by Asha Bhavana 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Shiva Singh 4 years, 6 months ago

Group of cell is called tissue

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Harshita Gangwani 4 years, 6 months ago

A group of cells that are similar in structure and/or work together to achieve a particular function forms a tissue

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Abhiram Deepak 4 years, 6 months ago

A group of cells that has a similar structure and/or work together to achieve a particular function is called a tissue.

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Jyotiraditya Shinde 4 years, 6 months ago

When 2 or more cell bound together. This is tissue.

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Riya Singh 4 years, 6 months ago

The structural unit of an organism

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a flower pots dropped from the age of the roof of a multi storied building calculate the time taken by the port to cross a particular distance ab of hai to decimal 9 metre the upper point 19 December 6 below the rope

Posted by Pappu Das 4 years, 6 months ago

CBSE > Class 09 > Science

0 answers

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Which is known as graveyard of RBC

Posted by Farhan Ahmed 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Farhan Ahmed 4 years, 6 months ago

Not spleem spleen

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Jyotiraditya Shinde 4 years, 6 months ago

Spleem

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Farhan Ahmed 4 years, 6 months ago

Spleen

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A wicket keeping gloves is dropped from a height of 40 m and simultaneously E A ball is thrown upward from the ground with a speed of 40 metre per second when and where they will meet

Posted by Ayush Pandey 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Jyotiraditya Shinde 2 years, 6 months ago

They will meet at height of 30m

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Chapter 8 important question for exam

Posted by Mohd Akhtar 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Harshita Gangwani 4 years, 6 months ago

All the 3 formulas of motion are important...from my point of view....we just need to understand the chapter and our application should be perfect..thats it

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Aryan Soni 4 years, 6 months ago

All chapter is important

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Hisham Ichoo 4 years, 6 months ago

Read the text fully note the important points make a summery chart and study well

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Niharika Sumant (Jiya) 4 years, 6 months ago

Important question of chapter 8 I only prefer to read and understand whole chapters (by this you can answer any question from the chapter) understand chapter in simple way as you can.

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Ansh Rana 4 years, 6 months ago

Vjc

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Who is the father of science ?

Posted by Digvijay Singh ?? 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Ayush Pandey 4 years, 6 months ago

Galileo Galilei

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Hisham Ichoo 4 years, 6 months ago

I think it is Galileo Galilei

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Geetha Sri 4 years, 6 months ago

Galileo Galilei was the father of science

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Niharika Sumant (Jiya) 4 years, 6 months ago

The Father of Science is Mr. Galileo Galilei.

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Afsana Ahmad S 4 years, 6 months ago

GALILEO GALILEI

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What are (ER) Endoplasmic reticulum

Posted by Niharika Sumant (Jiya) 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Arya 815X 4 years, 6 months ago

Endoplasmic reticulum, a continuous membrane system in eukaryotic cells that plays an important role in the biosynthesis, processing, and transport of proteins and lipids.

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Arya 815X 4 years, 6 months ago

Endoplasmic reticulum (ER), in biology, a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells and serves multiple functions, being important particularly in the synthesis, folding, modification, and transport of proteins . All eukaryotic cells contain an endoplasmic reticulum (ER). In animal cells, the ER usually constitutes more than half of the membranous content of the cell. Differences in certain physical and functional characteristics distinguish the two types of ER, known as rough ER and smooth ER.

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Niharika Sumant (Jiya) 4 years, 6 months ago

But in detail please

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Keshav Garg 4 years, 6 months ago

It is a type of cell organalle which had its own ribosomes and DNA

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Niharika Sumant (Jiya) 4 years, 6 months ago

And their types

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Please give me science sample paper 9

Posted by Prarthana Gowda 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Jyotiraditya Shinde 4 years, 6 months ago

Same here

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Jyoti Shiwal 4 years, 6 months ago

I also want pls...

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How to calculate Atomic mass?

Posted by Niharika Sumant (Jiya) 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Rituraj K 4 years, 6 months ago

Also we calculate atomic mass by no. Of protons + no. Of neutrons

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Yashika Yadav 4 years, 6 months ago

Atomic mass is based on the number of protons present in it's nucleus.

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Yashika Yadav 4 years, 6 months ago

Each element has different atomic mass, they are based on the numbers of protons and neutrons present in atom's nucleus

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Niharika Sumant (Jiya) 4 years, 5 months ago

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Uplaksh Goel 4 years, 6 months ago

You have to learn them...

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Difference Between Meristematic Tissue and Permanent Tissue???

Posted by Yash Malik 4 years, 6 months ago

CBSE > Class 09 > Science

4 answers

Iqra Siddique Siddique 4 years, 6 months ago

When cells have capacity to divide at certain place,which is responsible for the growth of plant is called MERISTEMATIC TISSUES. When cells lost their dividing capacity then it is called a PERMANENT TISSUES.

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Hisham Ichoo 4 years, 6 months ago

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Harsimran Grewal 4 years, 6 months ago

Meristematic tissue -three types-apical Meristematic, lateral Meristematic,intercalary Meristematic. Responsible for growth.Present at locations where plants grow like roots, stems. Cells can divide to form new cells. Permanent tissues -two types-simple and complex permanent tissues. Made up of those cells which have lost their capability to divide. They have definite shape, size, thickness.They may be dead or living.

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Digvijay Singh ?? 4 years, 6 months ago

Meristematic tissues in plants consist of a mass of undifferentiated cells whose main function is to participate in plant growth. Permanent tissues, on the other hand, are differentiated tissues, carrying out dedicated functions.

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What was the drawback of rutherford’s model of an atom?

Posted by Zoya Temrikar 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Vasudha Kakkat 4 years, 6 months ago

Inadequate to explain the stability of the atom Failed to explain the arrangement of electrons

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Geetha Sri 4 years, 6 months ago

This atomic model failed to explain stability of atoms. According to the model, electrons revolve around the positively charged nucleus. It's not possible for a long run as we know atoms are stable while any particle in a circular orbit would undergo acceleration.

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Aditya Kandpal 4 years, 6 months ago

The drawback of Rutherford model of an atom is that it does not explain the stability of an atom. According to Rutherford model of an atom electron move around nucleus in circular orbit and while moving electron would radiate energy and undergo acceleration and then merge with the nucleus. Hence the electron is not stable in this case

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Calculate the mass percentage of oxygen present in water

Posted by Vedansh Dubey 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Priyanshu Kumar Singh 4 years, 6 months ago

Mass of water= 18 u Mass of oxygen =16u Mass%= 16/18×100 =88.88%

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What is the Newton second law of motion

Posted by Shakti Kumar 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Tarunpreet Singh💯💯 4 years, 5 months ago

It states that rate of change of momentum is directly proportional to the applied force and takes place in the direction in which force is applied.

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Archana Rawat 4 years, 6 months ago

Newton's second law of motion states that acceleration of an object is directly proportional to the force applied and inversly proportional to the mass of the object

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Name the enzymes present in tear which prevents eye infection

Posted by Spoorti Buddinni 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Nikhil Kumar 4 years, 6 months ago

Lysozyme

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Archana Rawat 4 years, 6 months ago

Lysozyme

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Shakti Kumar 4 years, 6 months ago

Losozymes

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Send me the pic of pap3r

Posted by Gurpratap Singh Gill Chilli 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Manmohan Katiyar 4 years, 6 months ago

Ask your friends who have it or ur teachers For teachers first make the subject teacher your friend by chatting or whatever you want and then ask him to give you the question paper.

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During an experiment a single form a spaceship reach the ground station in five minutes what was the distance of the spaceship from the ground station the signal Travels at the speed of light that is 3 into 10 to the power 8 metre per second

Posted by Priyanshi Chauhan 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Iqra Siddique Siddique 4 years, 6 months ago

t=5min (5×60)sec =300sec, speed=3×10^8m/s distance =? Distance=speed × time Distance= 3×10^8×300 3×10^8×3×10^2 9×10^8+2 9×10^10m

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Charugoyal 10A 4 years, 6 months ago

Time =5 min (convert it into sec)=5×60=300 sec. Then speed = d/t then d = s × t....therefore 3×10^8m/s× 300 sec= 9× 10^8 m ans

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Priya Kumari 4 years, 6 months ago

Time- 5min [ 5×60=300sec] Speed- 3×10⁸m/s We have to find tha distance of spaceship from the ground that will be the Distance. Speed=Distance/time Distance=speed×time = 3×10⁸ ×300 =9×10¹⁰ m.

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Krish Achra? 4 years, 6 months ago

Sorry by mistake I have written Dr

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Krish Achra? 4 years, 6 months ago

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Define concentration of a solution.

Posted by Rounak Meda 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Yaman Pahal 4 years, 6 months ago

Contertration of solution = mass of solute/mass of solution ×100

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Priya Kumari 4 years, 6 months ago

Concentration of solution is the measure of solute present in the solution.

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How do substance like Co2 and water in and out of cell ?

Posted by Ashutosh 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Spoorti Buddinni 4 years, 6 months ago

By process of diffusion and osmosis respectively

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Priya Kumari 4 years, 6 months ago

Osmosis , Diffusion

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Kabya Jha 4 years, 6 months ago

By process of osmosis water molecules move in and out of the cell

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Why virus is don't show characteristics of life untill they enter in living body

Posted by Anurag Kansal 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Aditya Kandpal 4 years, 6 months ago

Because viruses are non cellular organisms they do not contain any cell hence do not show characteristics of life until they enter a living body and use it's machinery to reproduce

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Carbon atom sabhi element me kyu hota hai?

Posted by Sumit Kushwaha 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Jyotiraditya Shinde 4 years, 6 months ago

NaCl

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what are isotop and isotob

Posted by Yash Sharma 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Ashutosh 4 years, 6 months ago

Isotopes:Atoms of same elements have same atomic number but different mass number

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What is the charge of alpha particles? Give suitable reason according rutherford experiment ?

Posted by Arsh Kumar 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Rituraj K 4 years, 6 months ago

Alpha particles are positively charged particles

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what are the names of elements which are in liquid state

Posted by Ayush Pandey 4 years, 6 months ago

CBSE > Class 09 > Science

5 answers

Sidra Saifi 4 years, 6 months ago

{Mercury and bromine are the names of elements which are in liquid state..}

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Avyay Nampoothiry 4 years, 6 months ago

Go and search ? You will get as Mercury and Boron?

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Gagan Nishad 4 years, 6 months ago

Mercury and Boron..

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Arsh Kumar 4 years, 6 months ago

In metals it is *Mercury*

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Ann Lia Ros 4 years, 6 months ago

non metals

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Distinguish between isotopes and isobar

Posted by Subhalakshmi Anand 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Ash S 4 years, 6 months ago

Isotope has same atomic number but different mass number eg: types of hydrogen isobar has same mass number but different atomic number

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Janhvi Dwivedi 4 years, 6 months ago

Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons but different numbers of neutrons in each atom. Isobars are atoms of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number but have the same mass number. An example of a series of isobars would be ⁴⁰S, ⁴⁰Cl, ⁴⁰Ar, ⁴⁰K, and ⁴⁰Ca.

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Maanya Gupta 4 years, 6 months ago

Isotope are those atoms who have different mass numbers but same atomic number while isobars are those atoms who have different atomic number but mass number is same Isotopes are atoms of Same element but isobars are atoms of different elements

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The symbol of cadmium is

Posted by Nidhi Tiwari 4 years, 6 months ago

CBSE > Class 09 > Science