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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.

example- An example of a monosynaptic reflex is the patellar (knee jerk) reflex.

A SPONTANEOUS SUDDEN INVOLUNTARY MOTOR EFFECTOR RESPONSE DUE TO A SENSORY STIMULUS IS CALLED REFLEX ACTION.EXAMPLE - IMMEDIATELY REMOVAL OF HAND AFTER CONTACT WITH WARM WATER.

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Yes, there are many ways in which human interfere in ecosystems :1. Polluting water bodies.2. Deforestation : Cutting trees recklessly.3. Industry : Industry discharge dust particles into the environment.

Asexual reproduction is uni-parental whereas sexual reproduction is bi-parental

sexually reproducing species would have more chance of survival as variations are found in those species

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Species which is reproduced by sexual reproductions is more likely to have better chances of survival than the one with asexual reproduction. In asexual reproduction, mostly only one parent is present and the exact copy of parent is being produced as progeny therefore no genetic variation is observed. whereas in sexual reproduction, fusion of gametes takes place which includes genetic variation and hence Bette chances of survival.

a. The placenta is composed of both maternal tissue and tissue derived from the embryo. Thechorionisthe embryonic-derived portion of the placenta. It is composed of trophoblasts, which you may remember are the cells that made up the outer cell layer of the blastocyst.

The placenta serves as an interface between the mother and the developing fetus and has three main jobs:

Attach the fetus to the uterine wall

Provide nutrients to the fetus

Allow the fetus to transfer waste products to the mother's blood

b. i.HIV- Human influenza virus ii gonorrhea

c . The act aims to preventsex-selective abortion,

The stalk supporting a single flower is called a pedicel, that supporting an inflorescence, or an isolated flower, a peduncle

A food chain has only two or three levels. because the food chain has to connect one to another one. so food chain has only two or three levels. but food web has more.

Answer:

Because so much energy is lost to life processes.

Explanation:

As you progress through each trophic, each organism on that level loses energy gained from the previous trophic. This is due to losing energy through wasted material (e.g. bones) and to life processes, 7 of which can be remembered by MRS GREN:

MovementRespirationSensitivity

GrowthReproductionExcretionNutrition

This means that each time, energy is wasted and lost from the food chain. More than four trophics would result in so much energy being lost from the initial trophic (producer), that it would be largely pointless! This is shown very well in the diagram below:

Food chain consists of only 3 or 4 steps as food chain is the chain of animals which haves 3 or 4 types known as:producers,primary consumers,secondary consumers,tertiary consumers.

becoz due to 10% law there is transfer of only 10% of energy to the next trophic levels hence the levels are limited .

1. option d 2. sirius ... it is the brightest star .

Whenbright light is focused on our eyes, the photoreceptors generate electric impulses and send it to the spinal cord via the sensory neurons.

primary memory is the correct answer

dividing each term by 2x^2hence3x^3-2x^2+2x+1

Animal Cell Structure

Animal cells are typical of the eukaryotic cell, enclosed by a plasma membrane and containing a membrane-bound nucleus and organelles. Unlike the eukaryotic cells of plants and fungi, animal cells do not have a cell wall. This feature was lost in the distant past by the single-celled organisms that gave rise to the kingdomAnimalia. Most cells, both animal and plant, range in size between 1 and 100 micrometers and are thus visible only with the aid of a microscope.

Vaccines are products that protect people against serious and potentially deadly diseases.Vaccinesare products that produceimmunityto a specific disease.Most vaccines are given by injection (needle) but some are given orally (by mouth) or nasally (sprayed into the nose).Vaccinationis the act of introducing a vaccine into the body to produce immunity to a specific disease.

Vaccinationis the administration of avaccineto help the immune system develop protection from a disease.Vaccinescontain a microorganism or virus in a weakened or killed state, or proteins or toxins from the organism.

Vaccine preventable diseases currently include:1.diphtheria.2.tetanus.3.pertussis (whooping cough)4.poliomyelitis (polio)5.measles.6.mumps.7.rubella.8. haemophilus influenzae type b infections.

Vaccination is a treatment which makes the body stronger against a particular infection.

Vaccination is a treatment which makes our body fight back against an infection

vaccination treatment which makes the body strong and interparticle Infant vaccination first use of Louie and Edward Jenner Bacteria is smallpox

Edward Jenner discovered the vaccine.

Jenner made the first vaccine against smallpox.

A 'vaccine' is a biological preparation that improves immunity to a particular disease. A vaccine is an antigenic protein, inactivated or weakened live pathogen. On introduction of the body, it produces antibodies and memory B cells and memory T cells. Whenever the pathogen attacks a vaccinated person, the memory cells induce production of lymphocytes and antibodies that overwhelm and destroy the same.

Block Diagram of Computer System ::The Computer systemconsists of mainly three types that are central processing unit (CPU),Input Devices, and Output Devices .

1.Input Devices ::

The set of instruction or information is provided to the computer system or PC with the help of input devices such as (keyboard, mouse, scanners etc). The Instruction or data presented to computer system is converted into binary form then it is supplied to computer system for further processing .

2.Output Devices ::

Output devices of computerproduce or generate results with the help of devices or gadgets such as printer,monitor etc primarily these instruction or data provided to computer system is in binary code so to produce or generate the desired output the system has to convert this data into human-readable form, to do so it has to first present the data or instruction to computer system for further processing or handling.

3.CPU:The CPU is the heart | Brian of a computer because without the necessary action taken by the CPU the user cannot get the desired output. The central Processing unit [CPU] is responsible for processing all the Instruction which is given to computer system or PC. B

Amoebiasis entamoeba histolytica

4)Third generation vaccineThis type is used in pulse polio programDNAvaccinesarethird generation vaccines. They contain DNA that codes for specific proteins (antigens) from a pathogen. The DNA is injected into the body and taken up by cells, whose normal metabolic processes synthesize proteins based on the genetic code in the plasmid that they have taken up.

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A vaccine is a preparation that stimulates an immune response which can prevent an infection or create resistance to an infection. Vaccines contain dead or weakened microbes.when these are introduced in our bodies our body starts producing antibodies that stay in our body and fight against pathogens(disease causing microbes).Example:Vaccinia (smallpox)Measles, mumps, rubella (MMR combined vaccine)

A vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, recognize and destroy any of these microorganisms that it later encounters.

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it is of 5 marks

A vaccine is a biological preparation that provides active acquired immunity to a particular disease. A vaccine typically contains an agent that resembles a disease-causing microorganism and is often made from weakened or killed forms of the microbe, its toxins or one of its surface proteins. The agent stimulates the body's immune system to recognize the agent as a threat, destroy it, recognize and destroy any of these microorganisms that it later encounters.

pulse polio programs

Pulse Polio is an immunisation campaign established by the government of India to eliminate poliomyelitis (polio) in India by vaccinating all children under the age of five years against the polio virus. The project fights poliomyelitis through a large-scale pulse vaccination programme and monitoring for polio cases.

d. Tuberculosis

Bacillus Calmette–Guérin (BCG)vaccineis avaccineprimarily used against tuberculosis (TB). In countries where tuberculosis or leprosy is common, one dose is recommended in healthy babies as close to the time of birth as possible.

Biology is the natural science that studies life and living organisms, including their physical structure, chemical processes, molecular interactions, physiological mechanisms, development and evolution.

Biology is the natural science that studies life and living organisms, including their physical structure, chemical processes, molecular interactions, physiological mechanisms, development and evolution.

Living things include animals, plants, fungi (such as mushrooms), and microorganisms such as bacteria and archaea. The term 'biology' is relatively modern. ... People who studybiologyarecalledbiologists.Biologylooks at how animals and other living things (calledorganisms) behave and work, and what they are like. this is accurate answer for this question

Biologyis the natural science that studies life and living organisms, including their physical structure, chemical processes, molecular interactions, physiological mechanisms, development and evolution.

Biology is the natural science that studies life and living organisms.

biology is the study of all organs of animals and plants.

the scientific study of living things is called as biology

The scientific study of living things.

The oxygen dissociation curve is a graph showing the percentage saturation of oxyhaemoglobin at various partial pressures of oxygen.

The curve shows the equilibrium of oxyhaemoglobin and haemoglobin at various partial pressures.

In the lungs, the partial pressure of oxygen is high. Hence, haemoglobin binds to oxygen and forms oxyhaemoglobin.

Tissues have a low oxygen concentration. Therefore, at the tissues, oxyhaemoglobin releases oxygen to form haemoglobin.

The sigmoid shape of the dissociation curve is because of the co-operative binding of oxygen to haemoglobin. As the first oxygen molecule binds to haemoglobin, it increases the affinity for the second molecule of oxygen to bind. Subsequently, haemoglobin attracts more oxygen.Hence Haemoglobin is a positively co-operative protein

Biology is defined as the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, behaviour, origin, and distribution.

१. आग लगने पर तुरंत १०१ नंबर पर कॉल करके सूचना दें | यह न सोचें कि कोई दूसरा इसकी सूचना पहले ही दे चुका होगा |२. आग लगने पर सबसे पहले इमारत की अग्नि चेतावनी की घंटी (फायर अलार्म) को सक्रिय करें | फिर बहुत जोर से “आग-आग” चिल्लाकर लोगों को सचेत करें | चेतावनी कम शब्दों में ही दें, नहीं तो लोगों को घटना की गंभीरता समझने में ज्यादा समय लग जायेगा |३.आग लगने पर लिफ्ट का उपयोग न करें ,केवल सीढ़ियों का ही प्रयोग करें |४.धुएँ से घिरे होने पर अपने नाक और मुँह को गीले कपडे से ढँक लें |५. अगर आप धुएं से भरे कमरे में फँस जाएं और बाहर निकलने का रास्ता न हो ,तो दरवाजे को बंद कर लें ,और सभी दरारों और सुराखों को गीले तौलिये या चादरों से सील कर दें, जिससे धुआं अंदर न आ सके|६.अगर आग आपकी अपनी ईमारत में लगी है ,और आप अभी फ़से नहीं हैं तो पहले बाहर आएं और वहीं रूककर १०१ नंबर पर अग्निशमन सेवा को घटना की सूचना दें |७.अपने घर और कार्यालय में स्मोक (धुआं) डिटेक्टर अवश्य लगाएं क्योकि अपनी सुरक्षा के उपाय करना सदैव ही बेहतर और अच्छा होता है|८.निश्चित अंतराल पर इमारत में लगे फायर अलार्म, स्मोक डिटेक्टर, पानी के स्त्रोत ,सार्वजनिक उद्घोषणा प्रणाली , अग्निशामक की जांच करवाते रहें |९.अपने आस पास लगे अग्निशामक की तारीख जांच लें| ध्यान दें की समय समय पर उसकी सर्विसिंग हो और उसमे आग बुझाने वाले गैस अथवा केमिकल को बदला/भरा जाए|१०. अग्निशामक यन्त्र का प्रयोग कब और कैसे करना है ,इस बारे में अवश्य जाने और लोगों को भी इसकी जानकारी दें|

The process by which green plants make their own food from carbon-dioxide and water in the presence of sunlight and chlorophyll is called photosynthesis. During this process oxygen gas is released.

the points are1.stop deforestation2.dont waste electricity3.ban factories 4.stop using plastic bag 5.save water

The first aid that should be given to a person bitten by a snake are:-

Move the person beyond striking distance of the snake.

Have the person lie down with wound below theheart.

Keep the person calm and at rest, remaining as still as possible to keep venom from spreading.

Cover the wound with loose, sterile bandage.

Remove any jewelry from the area that was bitten.

Remove shoes if the leg or foot was bitten.

Anopheles carrier of malaria

R value is a 30 ohm is right answer

HCF of 12,18=6

Greatest length=6cm

hope this will help you like my answer and make it best answer

6cm is the answer of this question

hcf of 8 and 12 is 4

As electricity flows through a conductor, it has to "work" to overcome resistance, and this alters the current. Measuring the current is thus a useful diagnostic tool. Measuring current is a basic procedure that requires no previous electrical knowledge. An ammeter or digital multimeter is required.

Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

Osmosis is a process in which food particles are transported from areas of higher salute concentration to areas of lower solute concentration.

a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

Aim of the ExperimentTo demonstrate Osmosis process by Thistle funnel and egg's membrane.

Requirements:-Beaker, Water, Sugar solution, Egg's membrane, an iron stand.

Procedure for the experimentA wide mouthed thistle funnel with a narrow long stem was taken. Then an egg's membrane collected from an egg is tied tightly around the wide mouth of the funnel with the help of a thread or rubber band. Now dilute sugar solution is carefully poured into the stem of the funnel to a certain level. The wide mouth of the funnel containing sugar solution is now kept in a beaker with the help of an Iron stand. Now three fourths of the beaker is filled with plain water. A similar control setup also arranged but by taking plain water in the beaker and also plain water in Thistle Funnel. The apparatus are left undisturbed for 10 minutes and we observe the changes in the experimental setup as well as in control setup.

ResultAfter few hours we find the level of sugar solution increases from its initial level in the experimental setup while there is no change in the level of water in the stem of Thistle Funnel in the control setup. This observation clearly indicates the movement of water molecules occurred from the beaker into Thistle Funnel in the case of experimental setup while in the control setup that there is no movement of water molecules from beaker into Thistle Funnel through egg's membrane because both the solutions are of same concentration.

Precautions:-The egg's membrane has to be tightly fastened to the mouth of the funnel.The initial level of sugar solution in the thistle funnel should be carefully noted.

Osmosis is the movement of water molecules from the region of higher concentration to their region of lower concentration through a semipermeable membrane

Osmosisis the spontaneous net movement ofsolventmolecules through aselectively permeable membraneinto a region of highersoluteconcentration, in the direction that tends to equalize the solute concentrations on the two sides.

a) acceleration can be constant which will =9.8m/s^2 when we throw up an object in a medium of absence of air or that object falling towards the group in the same medium with constant acceleration and when a object is moving in a circular path acceleration is constant....after that acceleration increases with the distance when we move in a straight path through our vehicle.and it decreases during the applying of brakes of that vehicle