CBSE > Class 08 > Science | CBSE Board | Homework Help

cones, are one of three types of photoreceptor cells in the retina of mammalian eyes (e.g. the human eye). They are responsible for color vision and function best in relatively bright light, as opposed to rod cells, which work better in dim light.

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What is insident Ray and reflected ray

Posted by K Srikari Srahgvi 7 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Angellin Bl 7 years, 10 months ago

Incident ray is the ray of light falling on a surface and reflected ray is the ray of light which is reflected

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Pankhuee Dubey 7 years, 10 months ago

An incident ray is a ray of light that strikes a surface. ... The reflected ray corresponding to a given incident ray, is the ray that represents the light reflected by the surface.

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Give 2 examples of threatened wild animals

Posted by Nishant Kumar 7 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Angellin Bl 7 years, 10 months ago

Tiger ,leapords

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Pankhuee Dubey 7 years, 10 months ago

Leopard,saruscrane

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Udit Lath 7 years, 10 months ago

Tigers

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Safety measures taken during earthquake

Posted by Aditya Gaikwad 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Angellin Bl 7 years, 10 months ago

What Should I Do Before, During, And After An Earthquake? What to Do Before an Earthquake Make sure you have a fire extinguisher, first aid kit, a battery-powered radio, a flashlight, and extra batteries at home. Learn first aid. Learn how to turn off the gas, water, and electricity. Make up a plan of where to meet your family after an earthquake. Don't leave heavy objects on shelves (they'll fall during a quake). Anchor heavy furniture, cupboards, and appliances to the walls or floor. Learn the earthquake plan at your school or workplace. What to Do During an Earthquake Stay calm! If you're indoors, stay inside. If you're outside, stay outside. If you're indoors, stand against a wall near the center of the building, stand in a doorway, or crawl under heavy furniture (a desk or table). Stay away from windows and outside doors. If you're outdoors, stay in the open away from power lines or anything that might fall. Stay away from buildings (stuff might fall off the building or the building could fall on you). Don't use matches, candles, or any flame. Broken gas lines and fire don't mix. If you're in a car, stop the car and stay inside the car until the earthquake stops. Don't use elevators (they'll probably get stuck anyway). What to Do After an Earthquake Check yourself and others for injuries. Provide first aid for anyone who needs it. Check water, gas, and electric lines for damage. If any are damaged, shut off the valves. Check for the smell of gas. If you smell it, op

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Botanical name of Bhindi (Okra)

Posted by Neeraj Kumar 7 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Angellin Bl 7 years, 10 months ago

Abelmoschus esculentus

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@Isha? #Btsfan 7 years, 10 months ago

It's Abelmoschus esculentus neeraj

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Why should we dont read books while travelling??

Posted by Disha Shekhawat 7 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Angellin Bl 7 years, 10 months ago

Hope it helps!!!!!????

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Angellin Bl 7 years, 10 months ago

The pukishness, headaches etc stem from motion sickness. Motion sickness is aggravated for some people by reading or staring at any surface like a map or a phone because it causes a disconnect between ur perceived movement in a car and the movement of the fluids in your ears (this ear fluid assists in your body balance). You are basically feeling motion but not seeing it. And that throws your system. I suffer from such motion sickness and the explanation above is what I have gleaned from my research on it. Im not a doc so i dont know the scientific terminology for this. The wiki page on motion sickness should provide you the same answer in more technical terms!

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@Isha? #Btsfan 7 years, 10 months ago

Sometimes we get suffocated which results in vomiting sometimes..This is why I never read books while travelling ??

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Does pure water conduct electricty

Posted by Vaibhav Khedekar 7 years, 10 months ago

CBSE > Class 08 > Science

5 answers

Angellin Bl 7 years, 10 months ago

The reason is it does contain any salts or ionic compounds which could give a medium to pass electricity

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Angellin Bl 7 years, 10 months ago

No, pure water does not conduct electricity .

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@Isha? #Btsfan 7 years, 10 months ago

No vaibhav..pure water does not conduct electricity

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Siddhant Wadhai 7 years, 10 months ago

No distilled water do not conduct electricity

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Pankhuee Dubey 7 years, 10 months ago

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Example of communicable disease?

Posted by Hritik Kocher 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Pankhuee Dubey 7 years, 10 months ago

Tuberculosis,influenza,measles,malaria etc.

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Pole star is member of the solar system

Posted by Umakant Mishra 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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Why is cell considered as basic unit of life

Posted by Bunny Nithin 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 10 months ago

Cell is called the fundamental unit of life. A cell is capable of independent existence and can carry out all the functions which are necessary for a living being. A cell carries out nutrition, respiration, excretion, transportation and reproduction; the way an individual organism does. Unicellular organisms are capable of independent existence which shows a cell’s capability to exist independently. Due to this, a cell is called the fundamental and structural unit of life. All living beings are composed of the basic unit of life, i.e. cell.

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What is rational

Posted by Gurpreet Ahuja 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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What are cell organelles?

Posted by Tayyib Parker 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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List the properties of liquids in relation to pressure and give an example of how you can prove each

Posted by Sebi Sara 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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What is principal focus?

Posted by Trisha Singh 7 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Krishna Saw 7 years, 10 months ago

All lines converges and meet on a point that point is know as principal focus

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Hardik Patel 7 years, 10 months ago

I dont know

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What is bing bang theory

Posted by Hardik Patel 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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Wat is rusting of iron

Posted by Shweta Doshi 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Yogita Ingle 7 years, 10 months ago

When iron is exposed to water or air over a period of time, the iron reacts with oxygen in the presence of moisture to form a reddish-brown chemical compound, iron oxide. This is referred to as rust. So chemically, rust is hydrated iron(III) oxide or Fe₂O₃.nH₂O.
Iron reacts very readily with oxygen. This is one of the reasons as to why it is rare to find pure iron in nature.
Factors Affecting Rusting:
There are several factors that assist and accelerate the process of rusting. Some of them are:
(i) Moisture: Iron exposed to rains is the most common reason.
(ii) Acid: It accelerates rusting. When exposed to acid rains, iron rusts faster. On the other hand, alkalis inhibit rusting.
(iii) Salt: Iron tends to rust faster in sea, due to the presence of salt.
(iv) Impurity: Pure iron rusts slower than the iron mass which contains a mixture of metals.

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Five functions of chromosomes foundvin the cell.

Posted by Shruti Sonje 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Hardik Patel 7 years, 10 months ago

Its contain dna

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Last year paper

Posted by Siddharth Bagora 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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What is luminous zone?

Posted by Vaibhav Aggarwal 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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What Is Carrier

Posted by Yuvraj Singh 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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Which cell organelle secretes bio-molecules?

Posted by Swayamjit Mohanty 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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What is sliding friction ?

Posted by Sushil Jat 7 years, 10 months ago

CBSE > Class 08 > Science

0 answers

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Why is sliding friction less than static friction

Posted by Sachin Chauhan 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Vaibhav Aggarwal 7 years, 10 months ago

Because in sliding fiction contact forces do not get enough time to lock with irregularities

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hey Arprit do you know how object is seen by us?

Posted by Tarique Aziz 7 years, 10 months ago

CBSE > Class 08 > Science

3 answers

Nishchay Ranjan 7 years, 10 months ago

BT light

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Tarique Aziz 7 years, 10 months ago

this not familiar answer the main reason is retina contains some light sensitive cell which produce electical impulses then this inmpuses is sends by the obtic nerve and sends it to the brain

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Kushal Khandal 7 years, 10 months ago

When we see a object our eyes give focus on retina through coclea and retina send the image to brain through optic nerve and so we identity it

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Differentiate betn aerobic and anaerobic bacteria?

Posted by Jubair Ahmed 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Sachin Chauhan 7 years, 10 months ago

Bacteria which respirate in the presence of oxygen is called aerobic bacteria those respirate in absence of oxygen they are called anaerobic bacteria

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What are endoplasmic reticulum ?

Posted by Ankit Bahadur 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Shruti Sonje 7 years, 10 months ago

Endoplasmic reticulum is a network of tubules and channels.There are two types of ER - rough endoplasmic reticulum and smooth endoplasmic reticulum.They provide a large surface area for life functions.They help in the transport of materials such as proteins within the cells.

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Explain cytoplasm

Posted by Vansh Shukla 7 years, 10 months ago

CBSE > Class 08 > Science

1 answers

Arpit Kumar 7 years, 10 months ago

Cytoplasm is liquid substance which encloses the other cell organelles like mitochondrial, endoplasmic reticulum etc

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What is the function of nucleus

Posted by Manasvi Kadam 7 years, 10 months ago

CBSE > Class 08 > Science

2 answers

Arpit Kumar 7 years, 10 months ago

Functions of nucleus :- .1) Nucleus brings about cell division. .2) it is responsible for transmission of hereditary materials from one generation to another. .3) it acts as the control center for all the activities of the cell. HOPE U LIKE MY ANSWER☺️?...?

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Tarique Aziz 7 years, 10 months ago

to control all the activities of a cell

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Define asexual reproduction.describe the diffrent methods of asexual reproduction in animals that u have studied

Posted by Archana Sambre 7 years, 10 months ago

CBSE > Class 08 > Science