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Tanya ?? 5 years ago

Search from Google

4Thank You

ANSWER

name the part of gynoecium that determines the compatible nature of pollen grain.

Posted by Rohit Gawde 5 years ago

CBSE > Class 12 > Biology

3 answers

... Yang ... 5 years ago

?STIGMA? HoPe It HeLpS yOu??

Shubham Malik 5 years ago

Stigma

Heny Patel 5 years ago

Stigma

ANSWER

Father of genetics who?

Posted by Mansi Barthwal 5 years ago

CBSE > Class 12 > Biology

4 answers

Amlesh Kumar 5 years ago

Gregor Johann mendel

Devil ? 5 years ago

Mandel

Tanya ?? 5 years ago

George Mendel

4Thank You

... Yang ... 5 years ago

“Gregor Johann Mendel” is the father of Genetics.

ANSWER

Functions of ovary and testes

Posted by Rudra Pratap Singh 5 years ago

CBSE > Class 12 > Biology

2 answers

... Yang ... 5 years ago

FUNCTIONS OF OVARY: i) Production of OVA by oogenesis. ii) Production of female *** hormones (Progesterone & Estrogen). FUNCTIONS OF TESTIS: i) Production of SPERMS by seminiferous tubules by the process of spermatogenesis. ii) Production of male *** hormone (Testosterone) by Leydig Cells. HoPe It HeLpS yOu??

Yogita Ingle 5 years ago

Two major functions of testis are:
1) Production of sperms by seminiferous tubules by the process of spermatogenesis.

2) Production of male *** hormone, testosterone by Leydig cells.

Two major functions of ovary are:

1) Production of ova by oogenesis.

2) Production of female *** hormone, progesterone and estrogen.

ANSWER

Investigatory project on HIV and AIDS

Posted by Ølí ?? 5 years ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Investigatory project on human diseases

Posted by Ølí ?? 5 years ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Notes for 1 chapter

Posted by Md Siddiqui 5 years ago

CBSE > Class 12 > Biology

5 answers

Tanya ?? 5 years ago

But our teacher said that only asexual reproduction is deleted but sexual reproduction is their in the syllabus of cbse boards...

Mahendra Rathor 5 years ago

available in this app also

Devil ? 5 years ago

Chap 1 of bio is not in syllabus of cbse ... But if u are talking about neet then it is there ?

Tanya ?? 5 years ago

But it is in syllabus..

Devil ? 5 years ago

Not in syllabus

ANSWER

The given figure represents Habitat loss Mycorrhiza Termites none of the above

Posted by Mehakjot Gill 5 years ago

CBSE > Class 12 > Biology

0 answers

ANSWER

Write a note on Down’s syndrome.

Posted by Rajat Chauhan 5 years ago

CBSE > Class 12 > Biology

2 answers

Yogita Ingle 5 years ago

Down syndrome is a chromosomal disorder. It is due to aneuploidy of the autosome. There is one extra chromosome 21 or part of the chromosome present in all the cells or some cells.

The occurrence of Down syndrome is 1:800 live births. The major risk factor is the age of the mother. Most of the trisomy cases occur in the mother having age more than 35.

Down syndrome is caused due to abnormal cell division. During mitotic and meiotic cell division the chromosome pair separate so that each cell gets the copy of each chromosome. In down syndrome, the chromosomes are not able to separate, giving rise to cells with an unequal number of chromosomes. This phenomenon is called nondisjunction.

Nondisjunction happens, when chromosome segregates in anaphase before all of the replicated chromosomes’ kinetochores are attached to microtubules from opposite poles during metaphase. It results in one daughter cell having less chromosome and another with one extra chromosome.

Anjali Kumawat 5 years ago

This disorder was first describe by LANGDON DOWN (1866). Down syndrome or Down's syndrome, also known as trisomy 21, is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21. Plam is broad with characteristics plam crease, physical, psychomotor and mental development is retarded.

ANSWER

What is repetitive DNA and satellite DNA

Posted by Kirti Sharma? 5 years ago

CBSE > Class 12 > Biology

1 answers

Rajaneha Rajasekar 5 years ago

The non-coding sequence of DNA that are repeated several times in the genome of the individual are termed as repetitive DNA . Whereas satellite DNA is one of the various categories of repetitive DNA sequences that contain highly repetitive DNA. Depending upon the number of repeats, satellite DNA is grouped as minisatellites, microsatellites, and minivariant repeats.

ANSWER

What is humoral immune response,cell mediated immunity,and graft rejection??

Posted by Kirti Sharma? 5 years ago

CBSE > Class 12 > Biology

1 answers

Shubham Malik 5 years ago

Humoral Immune Response is carried by B Lymphocytes and Antibodies present in the blood. Cell Mediated Immunity is managed by T Lymphocytes while transplantation of organs or blood matching. Graft Rejection means check whether the organ of donor matches with that of patient. If it matches it can be transplanted.orthewise rejected because it can be harmful.

ANSWER

Why is it considered path breaking in the field of molecular biology???

Posted by K Sharma 5 years ago

CBSE > Class 12 > Biology

2 answers

Meghna Thapar 5 years ago

The field of molecular biology studies macromolecules and the macromolecular mechanisms found in living things, such as the molecular nature of the gene and its mechanisms of gene replication, mutation, and expression. Given the fundamental importance of these macromolecular mechanisms throughout the history of molecular biology, a philosophical focus on the concept of a mechanism generates the clearest picture of molecular biology’s history, concepts, and case studies utilized by philosophers of science.

Devil ? 5 years ago

What is ??

ANSWER

What is live

Posted by Rahul Roy 5 years ago

CBSE > Class 12 > Biology

1 answers

Sia ? 4 years, 5 months ago

make one's home in a particular place or with a particular person.

ANSWER

Explain loss of biodiversity

Posted by Riyaz Ahmad 5 years ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 5 years ago

Biodiversity loss, also called loss of biodiversity, a decrease in biodiversity within a species, an ecosystem, a given geographic area, or Earth as a whole. Biodiversity loss disrupts the functioning of ecosystems, making them more vulnerable to perturbations and less able to supply humans with needed services. Biodiversity loss can have significant direct human health impacts if ecosystem services are no longer adequate to meet social needs. Indirectly, changes in ecosystem services affect livelihoods, income, local migration and, on occasion, may even cause political conflict.

ANSWER

Why biology is important ?

Posted by Ragini Jha 5 years ago

CBSE > Class 12 > Biology

1 answers

Shiva N.?? Yadav?? 5 years ago

Biology is important because in it we study about the vital activitys of different organisms. Which help in developing medicine, knowledge of your body parts, knowledge of different diseases and their cure, etc.? It should help you.

3Thank You

ANSWER

Virus infected cells provide in a community to the other cells. How?

Posted by Ølí ?? 5 years ago

CBSE > Class 12 > Biology

1 answers

Shiva N.?? Yadav?? 5 years ago

Cells which are infected by viruses they provide community to the other cells by cell division. When a virus enter in cell they convert their DNA to cell's DNA. And during the cell division they also divide with cell's DNA. Hope this will help you ?

ANSWER

Pentafid stigma found in which family?

Posted by Saman Zehra 5 years ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 4 years, 11 months ago

The stigma, together with the style and ovary comprises the pistil, which in turn is part of the gynoecium or female reproductive organ of a plant. The stigma forms the distal portion of the style or stylodia. The stigma is composed of stigmatic papillae, the cells which are receptive to pollen. These may be restricted to the apex of the style or, especially in wind pollinated species, cover a wide surface.

The stigma receives pollen and it is on the stigma that the pollen grain germinates. Often sticky, the stigma is adapted in various ways to catch and trap pollen with various hairs, flaps, or sculpturings. The pollen may be captured from the air (wind-borne pollen, anemophily), from visiting insects or other animals (biotic pollination), or in rare cases from surrounding water (hydrophily). Stigma can vary from long and slender to globe shaped to feathery.

Pollen is typically highly desiccated when it leaves an anther. Stigma have been shown to assist in the rehydration of pollen and in promoting germination of the pollen tube. Stigma also ensure proper adhesion of the correct species of pollen. Stigma can play an active role in pollen discrimination and some self-incompatibility reactions, that reject pollen from the same or genetically similar plants, involve interaction between the stigma and the surface of the pollen grain.

ANSWER

Anybody can explain the replicating fork.

Posted by Anjali Kumawat 5 years ago

CBSE > Class 12 > Biology

1 answers

Meghna Thapar 4 years, 11 months ago

The replication machinery must have access to the leading and laggings strands for replication, and it must be able to open and stabilize the template DNA. The replication fork is the area where the replication of DNA will actually take place. There are two strands of DNA that are exposed once the double helix is opened. One strand is referred to as the leading strand, and the other strand is referred to as the lagging strand. During DNA replication a DNA double helix must unwind and separate so that DNA polymerase enzymes can use each single strand as a template for the synthesis of a new double strand.

ANSWER

Father of biology

Posted by Rajinder Kumar 5 years ago

CBSE > Class 12 > Biology

4 answers

Insha Khalid 5 years ago

Aristotle is the father of biology

Yogita Ingle 5 years ago

Aristotle is known as the “Father of Biology” because he extensively studied the natural world and contemplated its origins using scientific insights and systematic observations rather than attributing it to divine intervention. He was also the first to uncover the relationship between animals and establish a system of classification.

Anjali Kumawat 5 years ago

Father of biology is Aristotle

Joshna L 5 years ago

Aristotle is known as father of biology

ANSWER

Human genome project

Posted by Sameer Meher 5 years ago

CBSE > Class 12 > Biology

1 answers

Yangzee Sherpa 5 years ago

HUMAN GENOME PROJECT: Human genome project (HGP) was an international scientific research project which got successfully completed in the year 2003 by sequencing the entire human genome of 3.3 billion base pairs. The HGP led to the growth of bioinformatics which is a vast field of research. The successful sequencing of the human genome could solve the mystery of many disorders in humans and gave us a way to cope up with them. GOALS OF THE HUMAN GENOME PROJECT: #Optimization of the data analysis. #Sequencing the entire genome. #Identification of the complete human genome. #Creating genome sequence databases to store the data. #Taking care of the legal, ethical and social issues that the project may pose. APPLICATIONS OF HGP: *As the goals of the human genome project were achieved, it led to great advancement in research. Today, if any disease arises due to some alteration in a certain gene, then it could be traced and compared to the genome database that we already have. In this way, a more rational step could be taken to deal with the problem and can be fixed with more ease. *This project has opened up new horizons which can be learned in much detail with our expert faculty. HoPe It HeLpS yOu??

ANSWER

Define the term IUDs and explain it's various types

Posted by Sonu Yadav 5 years ago

CBSE > Class 12 > Biology

2 answers

Insha Khalid 5 years ago

IUDs :intra uterine device Two types 1.copper iUD: it makes the sperm immotile so that it can't fertilizer ova 2.hormonal IUDs:it prevent the formation of egg and also make uterus unsuitable for implantation. Ok its enough.

Yangzee Sherpa 5 years ago

IUDs (Intrauterine Devices) are small T-shaped devices that are planted in the uterus. There are 2 types of IUDs: i) Copper IUD:- Releases small amounts of Copper in the uterus which prevents sperms from reaching the ovary. ii) Hormonal IUD:- Releases progestin in the body which prevents the formulation of eggs. HoPe It HeLpS yOu??

ANSWER

Cell

Posted by Akshay Gupta 5 years ago

CBSE > Class 12 > Biology

3 answers

Insha Khalid 5 years ago

Cell is the structural and functional unit of life

Yangzee Sherpa 5 years ago

Cell is the structural and functional unit of all living beings. HoPe It HeLpS yOu??

Aditi Sharma 5 years ago

Cell is the basic structural and functional unit of life

ANSWER

What is aneuploidy? Differentiate between aneuploidy and polyploidy. “Give Long Answer”

Posted by Yangzee Sherpa 5 years ago

CBSE > Class 12 > Biology

1 answers

Yogita Ingle 5 years ago

Aneuploidy is the presence of an abnormal number of chromosomes in a cell. There is an extra chromosome present in this case.
Polyploidy is the presence of the extra set of the chromosome in the cells. There is a complete new set of the chromosome present. All the given conditions are the cases of aneuploidy. There are less or more number of chromosomes in the same set.

ANSWER

Difference between the gene and chromosome

Posted by Chetna Gupta 5 years ago

CBSE > Class 12 > Biology

2 answers

Yogita Ingle 5 years ago

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Gene is located on the chromosome.	Chromosomes are the packed structure of a DNA with proteins.
Genes are not visible under the microscope.	Chromosomes are visible under the microscope.
A single gene is a locus on a chromosome.	A single chromosome comprises of many genes.
Genes are composed of either DNA or RNA.	Chromosomes are composed of DNA, histones, and RNA.
Gene mutations are small.	Chromosomal mutations are relatively large.
Gene mutations lead to point mutations and frameshift mutations: insertions and deletions	Chromosomal mutations lead to chromosomal abnormalities such as deletion, duplication, rearrangement and inversion of genes.

Yangzee Sherpa 5 years ago

1) Gene is located on the chromosome, whereas chromosomes are the packed structure of a DNA with proteins. 2) Genes are not visible under the microscope, whereas chromosomes are visible under the microscope. 3) A single gene is a locus on a chromosome, whereas a single chromosome comprises of many genes. 4) Genes are composed of either DNA or RNA, whereas chromosomes are composed of DNA, histones, & RNA. 5) Gene mutations are small, whereas chromosomal mutations are relatively large. 6) Gene mutations lead to point mutations & frameshift mutations: insertions & deletions, whereas chromosomal mutations lead to chromosomal abnormalities such as deletion, duplication, rearrangement & inversion of genes. HoPe It HeLpS yOu??

ANSWER

How DNA is more stable than RNA?

Posted by Anmol ? 5 years ago

CBSE > Class 12 > Biology

3 answers

Parul Bhardwaj 5 years ago

Due to the OH group in 2nd carbon.

Insha Khalid 5 years ago

Because DNA have double stranded structure while RNA have single stranded structure. .also dna bases are not exposed while of rna bases are exposed.

Yangzee Sherpa 5 years ago

DNA is more chemically stable than RNA because it lacks the hydroxyl group on the 2' carbon. In RNA there are two possible OH groups that the molecule can form a phosphodiester bond between, which means that RNA is not forced into the same rigid structure as its deoxy counterpart. HoPe It HeLpS yOu??