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  • 0 answers
  • 1 answers

Gursharn Kaur 1 day, 2 hours ago

Photosynthesis is a process by which plants prepare their food from inorganic materials such as carbon dioxide,water,etc.in the presence of sunlight. Reaction proceeds as 6 CO2 +6 H2O --------6 C6H12O6+O2
  • 1 answers

Yogita Ingle 23 hours ago

The primary lymphoid organs are bone marrow and thymus where immature lymphocytes differentiate into antigen sensitive lymphocytes.

Bone marrow : Bone marrow is the main lymphoid organ where all blood cells including lymphocytes are formed. Maturation of B-lymphocyte occurs here.

Thymus : Thymus is the site for T-lymphocytes maturation. Thymus is situated near the heart.

The secondary lymphoid organs are spleen, lymph nodes, tonsils,Payer's patches of small intestine and appendix.

Spleen : It is a bean-shaped organ which is the largest single mass of lymphoid tissue in the body. In foetus the spleen produces all type of blood cells but in adult it only produces lymphocytes.

Lymph nodes : These are small solid structures found at intervals along the lymphatic system. They are composed of lymphoid tissue and act as filters for the lymph. Lymph nodes also produce lymphocytes and plasma cells.

Tonsils : Usually there are only 6 tonsils. They act as filters to protect the body from bacteria and aid in the formation of white blood cells.

Peter's patches : They are clusters of lymph nodules found in small intestine along the ileum. They produce lymphocytes.

Mucosal-Associated Lymphoid Tissue (MALT) : MALT are significant aggregation of lymphoid tissues which are seen in relation to the mucosa of the major tracts like respiratory, alimentary canal and urinogenital tracts. It constitute about 50% of the lymphoid tissue in human body. They don't serve as filters of lymph. They are centres of lymphocytes production. Phagocytic macrophages and dendritic cells are also present.

  • 1 answers

Yogita Ingle 23 hours ago

Immune system consists of-

  • Lymphoid organs
  • Lymphoid tissues
  • B- cells and T-cells
  • Antibodies

Lymphoid organs-

The organs where origin and/or maturation and proliferation of lymphocytes occur are called lymphoid organs.

Lymphoid organs are of two types-

1. Primary lymphoid organs

2. Secondary lymphoid organs.

The primary lymphoid organs are bone marrow and thymus where immature lymphocytes differentiate into antigen-sensitive lymphocytes.

The bone marrow is the main lymphoid organ where all blood cells including lymphocytes are produced.

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The thymus is a lobed organ located near the heart and beneath the breastbone.

Spleen, tonsil, lymph node, Peyer’s patches of small intestine and appendix are secondary lymphoid organs where proliferation of lymphocytes take place.

The secondary lymphoid organs provide the sites for interaction of lymphocytes with the antigen, which then proliferate to become effector cells.

The spleen is a large bean shaped organ mainly contains lymphocytes and phagocytes which acts as a filter of the blood by trapping blood-borne microorganisms and has a large reservoir of erythrocytes.

The lymph nodes are small solid structures located at different points along the lymphatic system.

Lymph nodes serve to trap the antigens and these antigens trapped are responsible for the activation of lymphocytes and cause the immune response.

 

  • 1 answers

Sanjay Kumar 1 day, 4 hours ago

To obtain results of their experiments from as more generations as possible and study their traits subsequently
  • 4 answers

Khuskaran Sidhu 18 hours ago

Gemmules r the structures formed during unfavourable cond. In some lower plants such as sponge as a mode of reproduction

Yogita Ingle 23 hours ago

Gemmules are internal buds formed inside freshwater sponges, e.g. Spongilla. These are formed during unfavourable conditions and help in perennation and dispersal. 

Sanjay Kumar 1 day, 4 hours ago

Unicellular cup like structures which undergo asexual reproduction are called gemmules

Prafful Agrawal 1 day, 12 hours ago

Gemmules are the units of asexual reproduction
  • 2 answers

Khuskaran Sidhu 18 hours ago

Syngamy + triple fusion = double fer. Very short note 🙃

Yogita Ingle 23 hours ago

Angiosperms are flower-bearing plants and are the most diverse group of terrestrial plants. The flowers form the reproductive part of angiosperms with separate male and female reproductive organs. Each contains gametes – sperm and egg cells respectively.

Pollination helps the pollen grains to reach stigma via style. The two sperm cells enter the ovule-synergid cell. This proceeds to fertilization.

In angiosperms, fertilization results in two structures, namely, zygote and endosperm, hence named, double fertilization.

Double fertilization is a complex process where out of two sperm cells, one fuses with the egg cell and the other fuses with two polar nuclei which result in a diploid (2n) zygote and a triploid (3n) primary endosperm nucleus (PEN) respectively.

Since endosperm is a product of the fusion of three haploid nuclei, it is called triple fusion. Eventually, the primary endosperm nucleus develops into the primary endosperm cell (PEC) and then into the endosperm.

The zygote becomes an embryo after numerous cell divisions.

  • 2 answers

Khuskaran Sidhu 18 hours ago

Temporary movement of an organism on unfavorable conditions to a safe place, ...migration. Eg.-sibrian birds migrate to Rajasthan

Prafful Agrawal 1 day, 12 hours ago

Migration is the process of leaving the currrent place where one is living and visting another place. It can be defined as resettlement from one place to another. Agar Thanku bolna hoga to mat bolna bas zab bhi chance mile kisi ki kaisee bhi help kr dena...live long
  • 2 answers

Sivan Karthick 1 day, 13 hours ago

Androgens are synthesised by a special type of cells present in testis called interstitialcells or leydig cells mainly testosterone(a type of androgen)

Amardeep Patel 1 day, 16 hours ago

Ledig cells
  • 0 answers
  • 3 answers

Sourabh Garg 1 day, 19 hours ago

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Parul Singh 2 days, 11 hours ago

Take u-like or exam idea

Shashwat Ranjan Pradhan 2 days, 14 hours ago

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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  • 2 answers

Sourabh Garg 1 day, 19 hours ago

Source organism : Bacillus thurengenesis Target post: cotton ball worms

Yogita Ingle 2 days, 23 hours ago

Source organism : Bacillus thuringlensis
Target pest : cotton ball worms

  • 1 answers

Srishti Mishra 3 days, 14 hours ago

It's a restriction enzyme I.e bacterial protein which cleave the DNA fragments near specific sites Also known as "molecular scissors"
  • 3 answers

Sourabh Garg 1 day, 19 hours ago

No

Shashwat Ranjan Pradhan 2 days, 14 hours ago

If you want then you can.😊😊😊

Chetna Bhatt 3 days, 18 hours ago

No
  • 1 answers

Sourabh Garg 1 day, 19 hours ago

RNA replicase
  • 1 answers

Gaurav Seth 4 days, 1 hour ago

Recombinant DNA technology involves several steps in specific sequence. These steps are as follows:

  • Iisolation of DNA,
  • Fragmentation of DNA by restriction endonucleases,
  • Isolation of a desired DNA fragment,
  • Ligation of the DNA fragment into a vector,
  • Transferring the recombinant DNA into the host,
  • Culturing the host cells in a medium at large scale
  • Extraction of the desired product.
  • 1 answers

Gaurav Seth 4 days, 1 hour ago

CBSE syllabus for 2019-20 is now available for download in CBSE official website and myCBSEguide Mobile App.

For the latest syllabus of 19 - 20 click on the below link o my cbse guide  to getan idea of deleted topics :

<a href="https://mycbseguide.com/blog/cbse-released-syllabus-for-2019-20/">https://mycbseguide.com/blog/cbse-released-syllabus-for-2019-20/</a>

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  • 83 answers

Parul Singh 4 days, 10 hours ago

Ok

Parul Singh 4 days, 10 hours ago

Its ok ho jaega...bye..gn..tc

Amaan Ansari 4 days, 10 hours ago

Okk thnx. Now u can sleep. And I also 😊😊

Parul Singh 4 days, 10 hours ago

Ok bye

Amaan Ansari 4 days, 10 hours ago

This content has been hidden. One or more users have flagged this content as inappropriate. Once content is flagged, it is hidden from users and is reviewed by myCBSEguide team against our Community Guidelines. If content is found in violation, the user posting this content will be banned for 30 days from using Homework help section. Suspended users will receive error while adding question or answer. Question comments have also been disabled. Read community guidelines at https://mycbseguide.com/community-guidelines.html

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  • Don't post personal information, mobile numbers and other details.
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  • Ask specific question which are clear and concise.

Remember the goal of this website is to share knowledge and learn from each other. Ask questions and help others by answering questions.

Parul Singh 4 days, 10 hours ago

Kl tak wait karo ho jaega don't worry

Parul Singh 4 days, 10 hours ago

Ha abhi nhi hoga thoda time lage ga

Parul Singh 4 days, 10 hours ago

Arei am telling u report content karo hat jaega

Amaan Ansari 4 days, 10 hours ago

Kar diya bahut baar report. Nahi hue delete 🙄🙄

Parul Singh 4 days, 10 hours ago

U too bye good night sweet dreams.

Parul Singh 4 days, 10 hours ago

Report kar do sab hat jaega

Amaan Ansari 4 days, 10 hours ago

M dekhta y kese delete ho sakte h😊

Amaan Ansari 4 days, 10 hours ago

Okk. Good night. Have a good dream..

Amaan Ansari 4 days, 10 hours ago

Mujhe bhi neend aa rahi h lkin abhi inhe msg ko aise hi ni chod sakta n. Kuch to karna padega inka 😊😊😊

Parul Singh 4 days, 10 hours ago

Will

Parul Singh 4 days, 10 hours ago

U do one thing report this content it clear all the chats

Parul Singh 4 days, 10 hours ago

Ok bye then i am going to sleep

Amaan Ansari 4 days, 10 hours ago

Kuch jaankari wagerah h k y msg kese delete ho sakte h 🤣🤣

Parul Singh 4 days, 10 hours ago

Accha

Parul Singh 4 days, 10 hours ago

No i am not in any social site

Amaan Ansari 4 days, 10 hours ago

Mujhe bhi abhi dhyaan aaya k y public section h 🤣😂

Amaan Ansari 4 days, 10 hours ago

Are u active on any social site 🙄🙄

Amaan Ansari 4 days, 10 hours ago

Ab samajh aaya 🤣🤣😊

Parul Singh 4 days, 10 hours ago

😂😂😂😂😂 baat karte karte pata hi nhi chla

Amaan Ansari 4 days, 10 hours ago

Abhi bhi samajh ni aaya kya k m kya batana chah raha hu🙄🙄🙄🙄

Parul Singh 4 days, 10 hours ago

Are ha

Amaan Ansari 4 days, 10 hours ago

Yahi to bolna tha jo upar kaha h. It is answering section and we are chatting publicly 😂

Parul Singh 4 days, 10 hours ago

Batao na jaldi ky baat h

Amaan Ansari 4 days, 10 hours ago

It is answering section and we are chatting publically 😂🤣😂🤣

Parul Singh 4 days, 10 hours ago

Ha batao kya

Amaan Ansari 4 days, 10 hours ago

Baat

Amaan Ansari 4 days, 10 hours ago

Ek maje ki bata batau 😊😊

Amaan Ansari 4 days, 10 hours ago

Both are right. I live in up

Parul Singh 4 days, 10 hours ago

Hmmm....u live in up or u r from up

Amaan Ansari 4 days, 10 hours ago

Up,

Amaan Ansari 4 days, 10 hours ago

Wo to chodna hi h. 😭😭. But school life is like a heaven on earth 😊😊

Parul Singh 4 days, 10 hours ago

U r from??

Parul Singh 4 days, 10 hours ago

Koi ni board exams ke baad khud hi chod doge

Parul Singh 4 days, 10 hours ago

Hahahahha

Amaan Ansari 4 days, 10 hours ago

Thnx 😊😊😊

Amaan Ansari 4 days, 10 hours ago

Hmm baat to Thik h bas school chodne ka Mann ni karta.. Aisa lagta h jese ki aage jindagee m kuch bachega hi ni school k baad😥😥

Parul Singh 4 days, 10 hours ago

I don't mind u can ask

Parul Singh 4 days, 10 hours ago

Mujhe lagta h ki November me ya fir abhi tak pre boards khatam ho jane chahiye the kyu ki ab ye month issme hi nikl jaega aur JAN me practicals h fir sir February hi mila complete study ke liye

Parul Singh 4 days, 10 hours ago

Delhi

Parul Singh 4 days, 10 hours ago

Yes mujhe late nhi kafi late lag rha h

Amaan Ansari 4 days, 10 hours ago

If you don't mind,,, are you from 🙄🙄

Amaan Ansari 4 days, 10 hours ago

Aapko y late lag raha 😂😂

Amaan Ansari 4 days, 11 hours ago

Yes.

Parul Singh 4 days, 11 hours ago

I am thinking itni late kyu start ho rhe h hamare pre board

Parul Singh 4 days, 11 hours ago

Do u take tuitions for physics??

Amaan Ansari 4 days, 11 hours ago

If you don't mind,, can I ask you a question 🙄

Parul Singh 4 days, 11 hours ago

Ohk

Amaan Ansari 4 days, 11 hours ago

May be since midth of the dec

Parul Singh 4 days, 11 hours ago

Yours??

Amaan Ansari 4 days, 11 hours ago

Itni jaldi 🙄🙄start

Parul Singh 4 days, 11 hours ago

This Friday

Amaan Ansari 4 days, 11 hours ago

When will your pre board start

Parul Singh 4 days, 11 hours ago

Main bhi book se hi padti hu biology specially

Parul Singh 4 days, 11 hours ago

Mee to

Amaan Ansari 4 days, 11 hours ago

Mere ko book se padhne ki habit h

Amaan Ansari 4 days, 11 hours ago

Socha try karke dekhte 😊😊

Parul Singh 4 days, 11 hours ago

Vaaah fir notes dhoond kyu rhe ho😂😂😂

Amaan Ansari 4 days, 11 hours ago

Lkin meri ek problem h m n kabhi bio notes se nahi padha 😊

Amaan Ansari 4 days, 11 hours ago

Ohhkk. I will find them 😊

Parul Singh 4 days, 11 hours ago

Because exam idea revision notes ke liye kafi acchi h

Parul Singh 4 days, 11 hours ago

But if i say necert and exam idea only

Parul Singh 4 days, 11 hours ago

Ohhh

Amaan Ansari 4 days, 11 hours ago

This is not what I want to ask 🙄 . Means these notes are available on cbse guide. Com or not

Parul Singh 4 days, 11 hours ago

Yes amaan cbse board se kar rhi hu

Parul Singh 4 days, 11 hours ago

I think online available h

Parul Singh 4 days, 11 hours ago

He has written download over there

Amaan Ansari 4 days, 11 hours ago

Means cbse board se hi study kar rahe ho kya

Amaan Ansari 4 days, 11 hours ago

Kahan milenge y pu bio notes 🙄🙄

Parul Singh 4 days, 11 hours ago

What from cbse?

Amit Raj Atul 4 days, 11 hours ago

Download online pu bio notes ,which is best for boards

Amaan Ansari 4 days, 11 hours ago

From cbse

Parul Singh 4 days, 11 hours ago

Yes

Amaan Ansari 4 days, 11 hours ago

R u also in class 12 bio

Parul Singh 4 days, 11 hours ago

Wlcm

Amaan Ansari 4 days, 11 hours ago

Yaah. Thnx

Parul Singh 4 days, 11 hours ago

Its ok🤗🤗. U should definitely do this. All the best.

Amaan Ansari 4 days, 11 hours ago

Thnx 😊. This is what I really do

Parul Singh 4 days, 11 hours ago

Read NCERT thoroughly and do revision from exam idea.
  • 4 answers

Amaan Ansari 4 days, 4 hours ago

Rashid bhai bio ka option click karte hi sample paper ka option aa jata h uper. Aap usme check kar sakte ho

Rashid Husain 4 days, 7 hours ago

Hi amaan where we see the sample papers provided by cbse for all subjects.?

Amaan Ansari 4 days, 11 hours ago

Only 5 . U can see sample paper provided by the Cbse 😊

Shalini Maurya 4 days, 13 hours ago

5 MCQ ..you can also see this thing in sample paper
  • 1 answers

Yogita Ingle 4 days, 16 hours ago

  • A food chain is a series of organisms where all the organismsare dependent on next organism as a source of food.
  • The series of organism take part at various biotic levels to form a food chain.
  • Each step of the food chain forms a tropic level.
  • The producers (green plants) are at the first tropic level.
  • Primary consumers (herbivores) are at the second tropic level.
  • Secondary consumers (small carnivores) constitute the third tropic level.
  • Tertiary consumers (larger carnivores) form the fourth tropic level.
  • Producers have the greatest number of individuals
  • 6 answers
Ok thanks
Mujhe 1 day me whole chemistry krni h I know it's not possible btt jitna ho skta h utna toh kro
Arrey bhai pehle easy chapters kr lo then tough ho jayega

Amaan Ansari 4 days, 11 hours ago

It's depends on u 😊

Aadi Ahluwalia 4 days, 13 hours ago

How
Yess why not
  • 3 answers

Amaan Ansari 4 days, 11 hours ago

Due to regeneration process. They can develop into a new organism only from a small part of their body

Bhawna Pal 5 days, 8 hours ago

Because after division there is no left behind of the organism thats why we can say that single celled organisms are immortal🌎

Aryan Sharma 5 days, 12 hours ago

Because mother cell divide into 2 or more daughter cell so there is no parental part is left..eg binary fission and budding

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