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

Vegetative propagation is an asexual method of reproduction in which new plants are obtained from the parts of old plants (like stems, roots and leaves) without the help of any reproductive organs.

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Neuron drawing with labelling

Posted by Navya Chitturi 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Neurons are nerve cells which are the functional units of the nervous system.

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Which tissue makes the husk of a coconut?

Posted by Sujith Sujith 7 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Garima Mittal 7 years, 1 month ago

Sclerenchyma tissue makes the husk of coconut

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Saumya Shukla 7 years, 1 month ago

Schlerenchyma tissue ☺️

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Ananya Agnihotri 7 years, 1 month ago

Schlerenchayma tissue.

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Prajjwal Upadhyay 7 years, 1 month ago

Screlenchymatous tissue

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A train of certain length is traveling at an uniform speed of 36kmph crosses a bridge of 600m in 80s. Find the length of the train.

Posted by Swayam Shivam Barpanda 7 years, 1 month ago

CBSE > Class 09 > Science

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state two difference between Base si unit and derived unit

Posted by Ahmed Saarim 4 years, 10 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 10 months ago

Base SI unit is the unit that used for simple quantity like time=second and length= meter. They only have one unit. Derived unit is more complex because you multiply or divide at least two base SI, making it have more than 1 unit.

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Q What are molecules

Posted by Jeeshan Khan 7 years, 1 month ago

CBSE > Class 09 > Science

4 answers

Akanksha Maurya 7 years, 1 month ago

A molecule is the smallest particle of an element or a compound that is capable of an independent existence and shows all the properties of that substance

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Vivek Biswas 7 years, 1 month ago

A group of atom chemically combined together capable of independent living

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Chaithra J 7 years, 1 month ago

The smallest particle of an element or compound is called molecules

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Legend K 7 years, 1 month ago

The smallest part of atom is called molecule

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Five kingdom and example

Posted by Akash Halkarni 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Akanksha Maurya 7 years, 1 month ago

Monera Cell type: prokaryotic Organism : unicellular Cell wall: may be present or absent. Nutrition: autotrophic or heterotrophic. Example bacteria,cyno bacteria, mycpplasma. Protista Cell type : Eukaryotic Organism : unicellular Cell wall may be present or absent Nutrition: autotrophic and heterotrophic Example unicellular algae ,protozoans Fungi : yeast and mushroom Plantae : trees plants shrubs Animalia insects birds humans

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Yash Preet 7 years, 1 month ago

Five kingdoms are Monera , Protista, fungi ,plantae and animalia

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I want all cemestry chapter of science

Posted by Manoj Mahto 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Chaithra J 7 years, 1 month ago

1.Matter in our surroundings 2.Is matter around us pure? 3.Atoms and molecules 4.Structure of atom

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Matter in our surroundings all 1marks questions

Posted by Amogh Dj Amogh Dj 7 years, 1 month ago

CBSE > Class 09 > Science

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Tell me what convert the mole number

Posted by Vicky Praveen 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Abhijeet Chauhan 7 years, 1 month ago

n=no of moles

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Abhijeet Chauhan 7 years, 1 month ago

See there are many ways to convert it Mainly two ways that are the inconvinient for the your purpose wait...

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List two means of spreading infectious diseases

Posted by Demon Rìãmūk 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Yogita Ingle 7 years, 1 month ago

The different means by which infectious diseases spread are:
(i) By direct contact between a healthy and an infected person.
(ii) By indirect contact between a healthy and an infected person.
(iii) Through air.
(iv) Through food.
(v) By vectors such as mosquitoes and insects, etc.
(vi) By the bite of a rabid animal.

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H V 7 years, 1 month ago

Air and water

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Inversre square rule

Posted by Raj Patel 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

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Calculate the number of aluminium ion present in 2g aluminium oxide

Posted by Sidharth Sahu 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Shreya Kim 7 years, 1 month ago

1gm of Al ion =6.022*10^23 Therefore, 2*avogadro constant will be the answer =12.044*10^23

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Why it is difficult to walk on sand ?

Posted by Arjun Rathore 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Arinan Aggarwal 7 years, 1 month ago

Because when we move on sand huge amount of force is applied on very small area therefore pressure is high therefore we face diffuculty

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Calculate the number of atoms of hydrogen present in one dozen molecules of hydrogen gas( in terms of number of moles ).

Posted by Yashwanth R 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Sidharth Sahu 7 years, 1 month ago

1 molecule of hydrogen gas contains 2 atom of hydrogen Therefore, one dozen of h2 molecules equals 24 atoms of H 6.022 ×10^23 molecule =1mole therefore, 12 molecules of H2=12÷6.022×10^23=1.99×10^-23 moles

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Yashwanth R 7 years, 1 month ago

Can I get the answer soon cause I've exams day after 2morrow

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What is nucleoids

Posted by Suraj Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Nooreen Fatima 7 years, 1 month ago

The central part of the nucleus is called nucleoids bounded with nuclear memberane

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Yashwanth R 7 years, 1 month ago

Nucleoids are the undefined nuclear region containing only nucleic acids in a bacterial cell

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Rewrite the scientific name correctly. ( 1) panthera Tigris( 2) periplaneta americana

Posted by Santosh Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Diya Agarwal 7 years, 1 month ago

Panthera tigris Periplaneta americana

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Santosh Kumar 7 years, 1 month ago

Panthera Tigris

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What is pendulum

Posted by Mohd Ashraf 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Pendulum is a body suspended from a fixed point so as to swing freely to and fro under the action of gravity and commonly used to regulate movements (as of clockwork).

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Can anyone can send me best notes for chemistry and physics??? Plzz?

Posted by Yeshik Garg 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Simran Baror 7 years, 1 month ago

U can download those from Google...

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Plz anyone can send me important notes of physics?

Posted by Garima Mittal 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Namitha Shekar 7 years, 1 month ago

Go through all d formulas, structure of ear, gravitation is a little important

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How is the black hole formed?

Posted by Jaydev Vaidya 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Akanksha Maurya 7 years, 1 month ago

By the collision of two stars

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What is dentrification?? ??

Posted by Garima Mittal 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sakshi . 7 years, 1 month ago

Denitrification is a microbially facilitated process where nitrate is reduced and ultimately produces molecular nitrogen through a series of intermediate gaseous nitrogen oxide products.

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What is fragmentation??

Posted by Garima Mittal 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sakshi . 7 years, 1 month ago

Fragmentation refers to the condition of a disk in which files are divided into pieces scattered around the disk. Fragmentation occurs naturally when you use a disk frequently, creating, deleting, and modifying files. At some point, the operating system needs to store parts of a file in noncontiguous clusters.

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Himalayan drainage system

Posted by Arshan Pathan 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

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Why is atmosphere essential gor life

Posted by Rahul Patil 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Akanksha Maurya 7 years, 1 month ago

Atmosphere is essential for life for the following mean: 1) it maintains the temperature of earth on the surface of earth during day and night time. 2) it contains ozone in tge upper layer which protects life from harmful UV radiation. 3) It contains various gases like CO2 ,N2 which are required for various life on earth 4) CO2 is dissolved in water forms carbonate which is required by aquatic animals to form shell. 5) CO2 is used by plants to prepare food by photosynthesis. 6) Oxygen is required for burning, combustion and respiration .

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Diya Agarwal 7 years, 1 month ago

Atmosphere is esential for life because atmosphere acts as a protection blanket in which the ozone layer filters the ultraviolet rays of the sun........Hope it helps?

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What is the process of forming cell membrane by lipids and protiens?

Posted by V K 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Diya Agarwal 7 years, 1 month ago

Memberane biogenesis

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it is important to learn page no. 167 table no. 12.1

Posted by Jay Joshi 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Akanksha Maurya 7 years, 1 month ago

No ,there is no need to learn this table . Just learn and understand one formula ... Vt= V0+ 0.6×t Here,t= temperature and V0 is the speed of sound of in that substance at 0°C

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In tincture of Iodine ,what is solvent and what is solute ??

Posted by Diya Tahiliyani 7 years, 1 month ago

CBSE > Class 09 > Science