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

1. Organisms whose cell do not have a definite cell membrane are called prokaryotes...... 2. Organisms whose cell contain a well-defined nucleus membrane are called eukaryotes......

0Thank You

Radheya Asardohkar 5 years, 2 months ago

Prokaryotic and eukaryotic cells are two vig classification of cells

0Thank You

Rose Cha 5 years, 2 months ago

prokaryotic cells are those cells who lacks a definite membrane bound nucleus and generally have a single chromosome eg cynobacteria{ blue green algae} eukaryotic cells have a definite membrane bound nucleus eg. fungi, plants animal etc

1Thank You

ANSWER

What is fertilization ?

Posted by Himanshu Neeraj 5 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Mcq questions

Posted by Sudhakar Venugopal 5 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What do Volatile substance means?

Posted by Ayush Rai 5 years, 2 months ago

CBSE > Class 09 > Science

4 answers

Kanav Dumra 5 years, 2 months ago

volatile mean as easily evaporated substance.

1Thank You

Ayush Rai 5 years, 2 months ago

Answer to batao

0Thank You

Ayush Rai 5 years, 2 months ago

0Thank You

Himanshu Neeraj 5 years, 2 months ago

Hi bro

0Thank You

ANSWER

How can we derive Newton's second law by using the first law?

Posted by Radhika Garg 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 5 years, 2 months ago

Second Law of Motion:

The second law of motion states that the rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of force.

The quantity of motion in a body depends on the product of mass and velocity of the body termed as momentum.

The momentum (p) of a body is defined as the product of its mass (m) and velocity (v) and has the same direction as that of the velocity. Its SI unit is kilogram metre per second (kg m s⁻¹).

Momentum = mass × velocity

p = m × v

Momentum has both magnitude as well as direction; hence it is a vector quantity.

Momentum of a body at rest is zero.

0Thank You

ANSWER

Why sodium kept in kerosene

Posted by Vijay Singh 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Ashish Rastogi 5 years, 2 months ago

Because they are highly reactive matel and thats why sodium is stored in kerosene

1Thank You

Abhi Ram Reddy 5 years, 2 months ago

Chb

3Thank You

ANSWER

Give one example each of diffusion of - 1. A solid into a liquid . , 2. A liquid into another liquid.,3.A gas into a liquid.,4.A gas into another gas

Posted by Krishna Verma 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Kanav Dumra 5 years, 2 months ago

1. Potassium permagnate in water. 2. Sugar solution in water. 3. Carbon dioxide in water . 4. Bromine gas in oxygen.

1Thank You

ANSWER

What is meaning of mass

Posted by Anita Kapadia 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Farzaan Khan 5 years, 2 months ago

Object

0Thank You

ANSWER

Meaning of mass

Posted by Anita Kapadia 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Atul Kumar Dwivedi 5 years, 2 months ago

Object

0Thank You

ANSWER

H4 mean

Posted by Baldev Dabhi 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Panavpreet Ahluwalia 5 years, 2 months ago

F**k

1Thank You

ANSWER

Who discovered electron microscope

Posted by Krushnanand Sahu 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Piyush Gupta 5 years, 2 months ago

Ernst rustka and max knoll

1Thank You

Insha Fatima 5 years, 2 months ago

Ernst ruska and max knoll discovered electron microscope in 1940.

2Thank You

ANSWER

a cyclist gose once round a circular track of Dia 105in5sec find it speed

Posted by :F::F: Gamer 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Kanav Dumra 5 years, 2 months ago

Speed = distance ---------------- time. 105/5 =21 per second

0Thank You

ANSWER

Sugar crystal is obtained from sugar cane and beetroot . Will it be a pure substance or a mixture? Give reasons.

Posted by Mahi Sucklecha 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Kanav Dumra 5 years, 2 months ago

No, sugar is a pure substance because it's one particle is sweet.

0Thank You

Swagat Panda 5 years, 2 months ago

It is a mixture because it is mixture of carbohydrates fat etc.

1Thank You

ANSWER

Define gravitational constant

Posted by :F::F: Gamer 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Ayush Rai 5 years, 2 months ago

It is the constant value with which we can find gravitational force acting between two objects.

1Thank You

ANSWER

Diffrence between uniform accelration and non uniform acceration

Posted by Shweta Akiwate 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Diwakar Roy 5 years, 2 months ago

In uniform acceleration the velocity changes uniformly i.e velocity changes at a constant rate but in non uniform acceleration the velocity does not change at a constant rate

2Thank You

ANSWER

Liquids generally have lower density as compared to solids. But you have observed that ice floats on water. Find out why.

Posted by Sushila Parihar 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

:F::F: Gamer 5 years, 2 months ago

Because ice have low density

1Thank You

Naman Jaiswal 5 years, 2 months ago

As ice have 0.9 density And water has 1.0 so obvious it willl float on water

1Thank You

ANSWER

Ray diagram of lens of both concave as well as well as convex .all ray diagram?

Posted by Unknown One 5 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Which organalle called power house ?why ?

Posted by Gagandeep Kaur 5 years, 2 months ago

CBSE > Class 09 > Science

5 answers

Kanav Dumra 5 years, 2 months ago

Mitochondria because it produces atp energy.

0Thank You

Muskan Gupta 5 years, 2 months ago

Mitochondria

2Thank You

Vedant Salve 5 years, 2 months ago

Mitochondria is correct answer .

1Thank You

Gurvanshbir Singh 5 years, 2 months ago

Mitochondria. Because it provides energy to the cell to perform various activities like respiration,absorbtion of food etc.

1Thank You

Yogita Ingle 5 years, 2 months ago

Mitochondria are known as the powerhouse of cells because energy required for various chemical activities needed for life is released by mitochondria in the form of ATP (Adenosine triphosphate) molecules.

3Thank You

ANSWER

A motorcar of mass 1200kg moving along a straiggt line with a uniform velocity of 90km/h . If velocity is slowed down to 18km/h in 4s by an unbalanced external force calculate the momemtum and acceleration . Also magnitude of force required

Posted by Prajwal Bhovi 5 years, 2 months ago

CBSE > Class 09 > Science

3 answers

Om Chaubey Chaubey 5 years, 2 months ago

Any bady explain me how you silve

1Thank You

Prajwal Patil 5 years, 2 months ago

Sorry momentum is 600kgms-2

2Thank You

Prajwal Patil 5 years, 2 months ago

Momentum is 7800kgms-2 and acceleration is 6.5ms-2

2Thank You

ANSWER

A hockey ball of mass 200 g traveling from west to east at 10 m/s is struck by a hockey stick.As a result ,then ball gets turned back and now has a speed of 5 m/s. If the ball and hockey stick were in contact for 0.02s , calculate the force exerted by hockey stick on the ball

Posted by Supriya Yadav 5 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

Show ray diagram of concave and convex lens

Posted by Unknown One 5 years, 2 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What were the problems of the Third Estate ?

Posted by Jiah Borbo 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Aditya Varma 5 years, 2 months ago

1-no voting right 2-not included in general ammesbly 3-lot of different taxes and revenues..

0Thank You

Yogita Ingle 5 years, 2 months ago

The members of the Third estate were unhappy with the prevailing conditions because they paid all the taxes to the government. Further, they were also not entitled to any privileges enjoyed by the clergy and nobles. Taxes were imposed on every essential item. Life was harsh for the members of the Third estate because they also had to pay additional taxes to their feudal lords.

0Thank You

ANSWER

What is densest state of matter 1. Solid 2. Liquid 3. Gases 4. Plasma Also explain why it is so

Posted by Satwik Banerjee 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Naman Jaiswal 5 years, 2 months ago

Bose einstien condensate . As it contain super cooled gas particle

0Thank You

ANSWER

Who made the new periodic table?

Posted by Rutaja Singh 5 years, 2 months ago

CBSE > Class 09 > Science

1 answers

Pavi Pandey 5 years, 2 months ago

In 1869 Russian chemist Dimitri Mendeleev started the development of the periodic table, arranging chemical elements by atomic mass. He predicted the discovery of other elements, and left spaces open in his periodic table for them. In 1886 French physicist Antoine Bequerel first discovered radioactivity.

2Thank You

ANSWER

Give the function of the ribosomes

Posted by Parth Gupta 5 years, 2 months ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 5 years, 2 months ago

The important ribosome function includes:

It assembles amino acid to form proteins that are essential to carry out cellular functions.
The DNA produces mRNA by the process of DNA transcription.
The mRNA is synthesised in the nucleus and transported to the cytoplasm for the process of protein synthesis.
The ribosomal subunits in the cytoplasm are bound around mRNA polymers. The tRNA then synthesises proteins.
The proteins synthesised in the cytoplasm are utilised in the cytoplasm itself, the proteins synthesised by bound ribosomes are transported outside the cell.

1Thank You

Satwik Banerjee 5 years, 2 months ago

It synthesises proteins located at rough endoplasmic reticulum

0Thank You

ANSWER

G.o of plant tissues

Posted by Madanu Daisy 5 years, 2 months ago

CBSE > Class 09 > Science