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Air borne. ex- common cold, chicken pox (at initial stage) Food /Water borne. Ex- cholera,Diahorrea Vector..... Formite borne(surface) - COVID Droplet borne. Ex- COVID, Omicron

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What is the microwave

Posted by Lakshay Dugawa 2 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Vijay Aditiyaa 2 years, 10 months ago

Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter corresponding to frequencies between 300 MHz and 300 GHz respectively. Different sources define different frequency ranges as microwaves; the above broad definition includes both UHF and EHF bands.

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Aryan Choudhary 2 years, 11 months ago

Microwave is an alliance in which the heat is produced

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what is nothing I'm asking example of "nothing"

Posted by Subhra Mishra 2 years, 11 months ago

CBSE > Class 09 > Science

4 answers

Subhra Mishra 2 years, 10 months ago

but if you are not doing anything means u are doing something

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Venkat Praveen V. 2 years, 10 months ago

Nothing means you're not doing anything. Also a person or thing or sentence is not present we can tell it as *Nothing*

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Subhra Mishra 2 years, 11 months ago

ok but I'm asking a question "what is nothing?"

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K_Hushii 🍁 2 years, 11 months ago

Everything asuasl , nothing special.

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Why is nucleus massive

Posted by Aryan Dixit 2 years, 11 months ago

CBSE > Class 09 > Science

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What is mechanism of action of antibiotics ?

Posted by Khushi Sharma 2 years, 11 months ago

CBSE > Class 09 > Science

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Derived the si unit of force by using thr graviration of force

Posted by Dawood Shams 2 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Shreya Tiwari 2 years, 11 months ago

Si unit of force is newton

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Pankaj Kumar Gupta 2 years, 11 months ago

Bshs

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Describe platyhelmenthes

Posted by Ƙӈʋƨӈɩ Vєʀmƛ 2 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Parii ☁ 2 years, 10 months ago

Also they have organ level of body organisation, reproduction is sexual as well as asexual, they are bisexual, they have specialized flame cells for excretion, Parasites have suckers and hooks for attachment, they are first triploblastic organisms. For example : Taenia solium -Pork tape worm, Taenia saginata - beef tape worm.

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Khushi Sharma 2 years, 11 months ago

They are triploblastic, acoelomate, and bilaterally symmetrical. They may be free-living or parasites. The body has a soft covering with or without cilia. Their body is dorsoventrally flattened without any segments and appears like a leaf.

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Chapter 4notes

Posted by Komal Bod 2 years, 11 months ago

CBSE > Class 09 > Science

2 answers

K_Hushii 🍁 2 years, 11 months ago

Tracheids cells

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Niyam Goyal 2 years, 11 months ago

Which tissue doesn't have parforated cell wall

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A brief Write up on Bio-geo chemical cycles.

Posted by Sandhya Singh 2 years, 11 months ago

CBSE > Class 09 > Science

1 answers

Khushi Sharma 2 years, 11 months ago

Biogeochemical cycles mainly refer to the movement of nutrients and other elements between biotic and abiotic factors.” The term biogeochemical is derived from “bio” meaning biosphere, “geo” meaning the geological components and “chemical” meaning the elements that move through a cycle. The matter on Earth is conserved and present in the form of atoms. Since matter can neither be created nor destroyed, it is recycled in the earth’s system in various forms. The earth obtains energy from the sun which is radiated back as heat, rest all other elements are present in a closed system. The major elements include: Carbon Hydrogen Nitrogen Oxygen Phosphorus Sulphur These elements are recycled through the biotic and abiotic components of the ecosystem. The atmosphere, hydrosphere and lithosphere are the abiotic components of the ecosystem. Types of Biogeochemical Cycles Biogeochemical cycles are basically divided into two types: Gaseous cycles – Includes Carbon, Oxygen, Nitrogen, and the Water cycle. Sedimentary cycles – Includes Sulphur, Phosphorus, Rock cycle, etc.

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Difference between Plasma Membrane and Cell Wall 3 points

Posted by Dipal Varia 2 years, 11 months ago

CBSE > Class 09 > Science

2 answers

Chaturya Karthikeya 2 years, 11 months ago

Plasma membrane is also called cell membrane(everyone knows this ?) 1)Cell membrane is present in both plant and animal cell but cell wall is present only in plant cell. 2)cell membrane is to give a shape and protection to the cell and cell wall in plant cell is to give extra protection to the plants (Extra point: Cell walls are present only in plant cell because animals have bones to protect them but plants don't have bones so they have cell walls for each cell to protect the cell from hypotenic solution {osmosis} from bursting .

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Prajit 2 years, 11 months ago

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The maximum speed of a train is 90 km/h It takes 10 hours to cover a distance of 500 km. The ratio of its average speed to maximum speed is:

Posted by K.G Kuru 2 years, 11 months ago

CBSE > Class 09 > Science