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Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors

Edward Jenner is a man of enlightment and believed in the intellectual and moral improvement of mankind in 1801 that the ''annihilation of small pox''.The most deadful disease of human lifeJenner is often called the father of immunology, and his work is said to have saved more lives than the work of any other human. A member of the Royal Society, in the field of Zoology he was the first person to describe the brood parasitism of the cuckoo.

Experiment

Louis Pasteur, the notable French scientist, accepted the challenge to re-create the experiment and leave the system open to air. He subsequently designed several bottles with S-curved necks that were oriented downward so gravity would prevent access by airborne foreign materials. He placed a nutrient-enriched broth in one of the goose-neck bottles, boiled the broth inside the bottle, and observed no life in the jar for one year. He then broke off the top of the bottle, exposing it more directly to the air, and noted life-forms in the broth within days. He noted that as long as dust and other airborne particles were trapped in the S-shaped neck of the bottle, no life was created until this obstacle was removed. He reasoned that the contamination came from life-forms in the air. Pasteur finally convinced the learned world that even if exposed to air, life did not arise from nonlife.

Shearing of the wool Is done with special instruments called

a is the answer ok it is a guss

love u ur bahut achi dilator ho

DNA structure of Watson and Crick.

I am not asking you about structure...my question is that who created the structure at the beginning of evolution by who and why they created

(b) ammonification my answer is a right

Assimilation produces large quantities of organic nitrogen, including proteins, amino acids, and nucleic acids. Ammonification is the conversion of organic nitrogen into ammonia. The ammonia produced by this process is excreted into the environment and is then available for either nitrification or assimilation.

(b) is correct option

Transverse binary fission: Takes place in ciliates such as paramecium.

9) When x=0

Then 0+0-a=5

Hence a=-5

10) When a=5 and b=-3

Then

2(25-15)+3-1520+3-15=8

Airborne disease can spread when an infected person coughs, sneezes, or talks, spewing nasal and throat secretions into the air. Certain viruses or bacteria take flight and hang in the air or land on other people or surfaces.

When you breathe airborne pathogenic organisms in, they take up residence inside you. You can also pick up germs when you touch an infected surface, and then touch your own eyes, nose, or mouth.

Because these diseases travel in the air, they’re hard to control. Keep reading to learn more about the common types of airborne diseases and what you can do to protect yourself from catching them.

find the perimeter of square of side 16 cm

V5+V2/ V5-V2 x V5-V2/ V5-V2=( V5+V2)( V5+ V2)/( V5)^2-( V2)^2=5+2+2V10/5-2=7+2V6/3;

V3 + V2/ V3-V2× V3+V2/ V3-V2=(( V3)+( V2))^2/3-2=5+2V6/1=5+2V6; a=5; b=2; V6=V6

a=5 & b=2 is the right answer

a=5 , b=2 is the correct answer

Option d Africa is known to have origination. of homo sapiens

Option dAfrica is the place where homo sapiens are known to have the origins from.

Evolution has lead to the divergence of the life into numerous different ways. As we come across all these life forms, there is a need that we can study and observe them in a systematic manner, to co-relate them which will help us to understand them in the best possible way. Here comes the need to classify these organisms on the basis of their features, taking into account of their similarities and differences. Gradually evolution has lead to a systematic and appropriate classification system.

Ans :- Zoology or animal biology is the branch of biology that studies the animal kingdom, including the structure, embryology, evolution, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems.

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Reflex actions are sudden, involuntary reactions of the body in response to stimuli. They occur without the involvement of the conscious areas of the brain. Therefore, all reflex actions are unconscious actions. Somatic nervous system is responsible for reflex arcs.

Reflex arcis the path of impulses in the reflex action.Reflex actions occur both from the brain and spinal cord which are the parts of the central nervous system.

Most often these actions are mainly formed from the spinal cord. When sudden responses are required, instructions are given by the spinal cord itself. Impulses reach the brain only after that. Later conscious responses are made.

thanks but it is not right answer

Areflex, orreflex action, is an involuntary and nearly instantaneous movement in response to astimulus.A reflex is made possible byneural pathwayscalledreflex arcswhich can act on an impulse before that impulse reaches the brain. The reflex is then an automatic response to a stimulus that does not receive or need conscious thought

A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain.

To get relief fromheartburn,drinkup a glass of coldbuttermilk.Buttermilkcontains lactic acid that neutralizes the acidity in the stomach. The lactic acid further soothes the stomach by coating the stomach lining and reducing the irritation andacid refluxsymptoms.

The size and shape of a cell are related to its function and are governed by four factors—

(1) surface-volume ratio

(2) nucleocytoplasmic ratio

(3) the rate of cellular activity

(4) cell associations.

Three general factors determine cell shape: the state of the cytoskeleton, the amount of water that is pumped into a cell, and the state of the cell wall.

Each of these three factors is highly dynamic, meaning they are constantly in flux or can be suddenly changed. This dynamism is how cells can vary in shape.

Cytoskelteton is network of protein fibres throughout a cell. This scaffolding maintains the shape of cell. Another structural component is cell membrane a fluid of phospholipids. It is lipid bilayer separating the room of cell into organelles and from outer space.

Three general factors determine cell shape: the state of the cytoskeleton, the amount of water that is pumped into a cell, and the state of thecell wall. Each of these three factors is highly dynamic, meaning they are constantly in flux or can be suddenly changed. This dynamism is how cells can vary in shape.

There are13Vitamins our body needs. They are vitamins A, C, D, E, K and the B vitamins (thiamine, riboflavin, niacin, pantothenic acid, biotin, vitamin B-6, vitamin B-12and folate).

Organic food is food produced by methods that comply with the standards of organic farming. Standards vary worldwide, but organic farming in general features practices that strive to cycle resources, promote ecological balance, and conserve biodiversity. Organizations regulating organic products may restrict the use of certain pesticides and fertilizers in farming. In general, organic foods are also usually not processed using irradiation, industrial solvents or synthetic food additives.

total number of bone in human in 206

human body has 206 bones

Total Number of Bones in Human Body are 206 in adults and About 300 Bones in children

The total no. of bones in human body are 206.

the total number of bones is 206

The total number of bones in the human body is 206

Every single person has a skeleton made up of many bones. These bones give your body structure, let you move in many ways, protect your internal organs, and more. It's time to look at all your bones — the adult human body has206of them!

Human body has 206 bones

total number of bone in human is 206

The total number of bones in human body is 206

206 bones are the total number of bones in our body

Total number of bones in human body are 206

𝙏𝙤𝙩𝙖𝙡 𝙉𝙪𝙢𝙗𝙚𝙧 𝙤𝙛 𝘽𝙤𝙣𝙚𝙨 𝙄𝙣 𝙝𝙪𝙢𝙖𝙣 𝘽𝙤𝙙𝙮 𝙖𝙧𝙚 206

number of bones in human body are 206

In human body the total number of bones is 206

206 bones in normal human body

TOTAL NUMBER OF BONES IN HUMAN BODY ARE 206.

Atherosclerosis is a specific type of arteriosclerosis, but the terms are sometimes used interchangeably. Atherosclerosis refers to the buildup of fats, cholesterol and other substances in and on your artery walls (plaque), which can restrict blood flow.

Organisms differ in their form, structure and mode of living. Hence, based on their similarities they should be grouped. The grouping of related organisms helps us in studying their evolutionary relationships. Classification is the division of organisms on the basis of characteristics into groups and sub-groups. A characteristic may be a particular form or function.For example, classification of animals can be done based on some criteria.Criteria for classification:Animals are classified on the basis of different features.*Cellular or tissue level of body organisation.*Body symmetry.*Type of body cavity called as coelom.*Presence or absence of segmentation.*Presence or absence of a backbone.Evolution:It is the sequence of gradual changes over millions of years in which new species are produced. Classification of species is done by knowing the characteristics which evolved over a long period of time.

1) In human beings implantation is the stage of pregnancy at which embryo adheres to the wall of uterus. at the stage of prenatal development the conceptus is called a blastocyst. it is by adhesion that the embryo receives oxygen and nutrients to the mother to be able to grow. 2)placenta is a disc shaped structure which is embedded in the uterine wall of human female.it contains villi on the embryos side of the tissue.it is also helpful in excretion as the waste generated by the developing embryo can be removed by passing or transferring them into mothers blood through placenta.

a) Implantation is the beginning of pregnancy at which stage the embryo adheres to the wall of the uterus.Some embryos fail to implant in the womb, while others implant successfully, leading to pregnancy.

b)A special tissue embedded in the uterus wall with the help of which human embryo gets nutrition from mother’s blood.

Piskacek's sign is the asymmetrical enlargement of the uterus when there is lateral implantation.

what is fernwald's sign

Von Braun-Fernwald's sign is a clinical sign in which there is an irregular softening and enlargement of the uterine fundus during early pregnancy. It occurs at 5–8 weeks gestation

a is cell bodyb is axon

A - Cyton B - Axon

Reason: Reason is quite simple it's because dendrites are present on cyton and The end point of Neuron is called as Axon.

Cyton:

It is also called as Soma. It has dendron, dendrites , nucleus with it.

Axon:

It is the end part of the Neuron. Synaptic knobs are present in it

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Definition ofzygomorphic. of aflower. : havingfloralparts unequal in size or form so that thefloweris capable of division into essentially symmetrical halves by only one longitudinal plane passing through the axis.

An actinomorphic flower is a type of flower that possesses radial symmetry. Any type of cut through the centre will divide the flower into two equal parts. Also known as "star-shaped", “regular”, “radial” or a “polysymmetric” flower, actinomorphic flowers can be bisected at any point and have two identical halves. e.g. Mustard flower.

Zygomorphic flowers are those which are bisected into two equal halves from only one plane. e.g. Pea flower.

Some flowers cannot be divided into two similar halves by cutting along any axis. e.g. Some species of Cactus

1)having floral parts unequal in size or form so that the flower is capable of division into essentially symmetrical halves by only one longitudinal plane passing through the axis2)

Centriole- They give rise to basal granules of cilia and flagella, and to produce spindle apparatus at the time of cell division.Each cetriole has 9 peripheral groups of triplet microtubules, without any central microtubules. This is called 9+0 pattern.

Cilia- Cilia is as organ of locomotion of cells by their sweeping or pendular vibrations.Each cilium shows 9 peripheral groups of doublet microtubules arranged in a circle, and two singlet microtubules in centre enclosed in a sheath. This is called 9+2 pattern.

Prokaryotic flagella are made of specialized proteins. Eukaryotic flagella are composed of microtubules surrounded by a plasma membrane.Microtubulesare just one component of the eukaryotic cellcytoskeleton,which functions to do things like organize and support cell structures just like your own boney skeleton supports you. Microtubules are made up of alpha and beta tubulin proteins dimers (pairs), which link together to form long chains.

Ans :- Allcoelenteratesare aquatic, mostly marine. The bodyform is radially symmetrical, diploblastic and does not have a coelom. The body has a single opening, the hypostome, surrounded by sensory tentacles equipped with either nematocysts or colloblasts to capture mostly planktonic prey.

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Option (2) is correct. Datura,masturd and tomato are actinomorphic flowers

Rutherfordconducted alpha scattering experiment and put forward amodelofatomknown asRutherford's nuclear model.Thesalientfeaturesof thismodelare as follows: (i)The atomcontains a central part called nucleus which is surrounded by electrons. (ii)Thenucleus of anatomis positively charged.

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In chemistry, the law of definite proportion, sometimes called Proust's law or the law of definite composition, or law of constant composition states that a given chemical compound always contains its component elements in fixed ratio and does not depend on its source and method of preparation.

The Law of Constant Composition, discovered by Joseph Proust, is also known as the Law of Definite Proportions. ... The French chemist Joseph Proust stated this law the following way: "A chemical compound always contains the same elements combined together in the same proportion by mass."·

Ans :- People working in these roomswear facemasks to protect themselves from bacteria. You must stay in the room to prevent spreading bacteria. If you are infectious while at home, protect yourself and others as follows: Wash your hands after sneezing, coughing or holding your hands near your mouth or nose.

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If someone is not ontreatment, then precautions such ascough etiquette, must be taken to prevent TB spreading from one adult to another. Another main part of TB prevention is to prevent people with latent TB from developing active, and infectious, TB disease.

A growth movement of a plant part in response to an external stimulus in which the direction of stimulus determines the direction of response is called tropism .

Example :- The bending of plant stem towards light is an example of positive phototropism