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निम्न कारणों से He, Ne, Kr, Xe और Rn जैसे महान गैसों को एक अलग समूह में रखा गया है:

वे बेहद गैरवाजिब हैं।

वे आवर्त सारणी के किसी भी अन्य तत्व के साथ संयोजन नहीं करते हैं

प्रदूषण के मुख्य प्रकार

वायु प्रदूषण: -वातावरण में रसायन तथा अन्य सुक्ष्म कणों के मिश्रण को वायु प्रदूषण कहते हैं। सामान्यतः वायु प्रदूषणकार्बन मोनोआक्साइड,सल्फर डाइआक्साइड,क्लोरोफ्लोरोकार्बन (सीएफसी)और उद्योग और मोटर वाहनों से निकलने वाले नाइट्रोजन आक्साइड जैसे प्रदूषको से होता है।धुआँसावायु प्रदूषण का परिणाम है। धूल और मिट्टी के सूक्ष्म कण सांस के साथ फेफड़ों में पहुंचकर कई बीमारियाँ पैदा कर सकते हैं।

जल प्रदूषण:- जल में अनुपचारित (अवाच्छित) घरेलू सीवेज के निर्वहन औरक्लोरीनजैसे रासायनिक प्रदूषकों के मिलने से जल प्रदूषण फैलता है। जल प्रदूषण पौधों और पानी में रहने वाले जीवों के लिए हानिकारक होता है।

भूमि प्रदूषण:- ठोस कचरे के फैलने और रासायनिक पदार्थों के रिसाव के कारण भूमि में प्रदूषण फैलता है।

प्रकाश प्रदूषण:- यह अत्यधिक कृत्रिम प्रकाश के कारण होता है।

ध्वनि प्रदूषण:- अत्यधिक शोर जिससे हमारी दिनचर्या बाधित हो और सुनने में अप्रिय लगे, ध्वनि प्रदूषण कहलाता है।

रेडियोधर्मी प्रदूषण:- परमाणु उर्जा उत्पादन और परमाणु हथियारों के अनुसंधान, निर्माण और तैनाती के दौरान उत्पन्न होता है!

Thethalamusis a modified stem as it possesses distinct nodes and internodes. It supplies nutrients toflowerjust like stems transfer it to leaves.ThalamusisLocatedat the basal part offlowernear the lower stalk of anther.

The thalamus is astructurein the middle of the brain. It is located between thecerebral cortexand the midbrain. It works to correlate several important processes, including consciousness, sleep, andsensoryinterpretation

Asexually reproducingorganismscan makeexact copies of themselves. But it is impossible that allorganisms producesimilarorganisms. In sexually reproducingorganismsthere is variation due to the combination of genes. The variation may be in their structural and physical appearance.

It is possible in asexual mode of reproduction. In this mode, only single parent contributes to the gene pool.In sexual mode of reproduction there will be variations.

Asexually reproducingorganismscan makeexact copies of themselves. But it is impossible that allorganisms producesimilarorganisms. In sexually reproducingorganismsthere is variation due to the combination of genes. The variation may be in their structural and physical appearance.

Themost significantuses of coalare in electricity generation, steel production, cement manufacturing and as a liquid fuel. Steamcoal- also known as thermalcoal- is mainlyusedin power generation. Cokingcoal- also known as metallurgicalcoal- is mainlyusedin steel production.

plz accepted as best plz like my answer plz

Uses of Coal

DifferentUses of Coal.Coalis seemingly the cheapest and most essential source of energy. ...Generating Electricity.Coalis generally used in thermal power generation which further helps to produce electricity. ...Production of Steel. ...Industries. ...Gasification and Liquefaction. ...Specialist Products. ...DomesticUse.

Uses of coal.Coalhas many importantusesworldwide. The most significantuses of coalare in electricity generation, steel production, cement manufacturing and as a liquid fuel. Steamcoal- also known as thermalcoal- is mainly used in power generation.

to produce electricity.manufacturing of steel

1.use as the steam engine at train 2 .gives other substance that use for making many things

energy flux =20w/cm^2energy =20*30=600momentum =600/30=20

The label of a herbarium sheet does not carry information on height of the plant.

thanks it is useful

This ultimately helps in growth of new plants and theforests. The droppings of animals and dead leaves of plants are decomposed by the decomposers and converted into nutrients. These nutrients are utilized by the seeds to grow. Thusforestis full of life and vitality so it iscalledadynamic living entity.

plants are eaten by herbivores animals

greenhouse effect is the trapping of the sun's warmth in a planet's lower atmosphere, due to the greater transparency of the atmosphere to visible radiation from the sun than to infrared radiation emitted from the planet's surface.

The greenhouse effect is the process by which radiation from a planet's atmosphere warms the planet's surface to a temperature above what it would be without its atmosphere. If a planet's atmosphere contains radiatively active gases they will radiate energy in all directions

Importance-1)Thegreenhouse gasesabsorb some of this energy and radiate much of it back towards the surface whilst the rest is radiated out to space.

2) This plays animportantrole in keeping the Earth's surface warm and able to sustain life

Vegetative propagationis a form of asexualreproductionof aplant. Only oneplantis involved and the offspring is the result of one parent. The newplantis genetically identical to the parent.

c. pureline selection...

c is the correct answer

One of the main benefits of eating roughage is that it helps to regulate your digestion. Insoluble fiber provides bulk in your intestines and helps to keep food moving through your digestive tract. Insoluble fiber absorbs water and swells into a gel that helps to keep bowel movements soft and easy to pass.

Water and roughage (fiber) are so important from our body to function properly.

Water is critical for hydration and cell function. High quality water is a must for optimum performance and cell function.

Fiber is critical for the function of our digestion system and our gut microbiome. Fiber helps keep waste moving through our digestive track but more importantly fiber feeds the microbes in our gut. No food no microbes. The gut is 80% of the immune system. The gut produces almost 90% of our serotonin - the happiness hormone. The gut is connected to your brain via the gut brain pathway. Happiness and health starts in the gut and ends in the gut. Fail to feed the microbes in your gut and you will be one unhappy - unhealthy person.

bats are classified as mammals, meaning that they are warm-blooded vertebrates that usually have hair or fur, and give milk to their offspring.

Ans :- option (b) is correct

Whales and Walruses are included in class Mamalia further distinguised as Marine Mammals.

Metalsare good conductors, which means that electricchargesmove easily through them. Materials such as plastic, wood, glass and polythene are insulators. This means theydo notallow electricchargesto move through them. Some insulators canbecomeelectricallychargedwhen they're rubbed together

please like the solution 👍 ✔️

The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture and circulates blood throughout the body. The muscular systems in vertebrates are controlled through the nervous system although some muscles can be completely autonomous.

platelets are responsible for the clotting of blood.

Homologous chromosomes are chromosome pairs, one from each parent, that are similar in length, gene position and centromere location.

option (c) is correct.

because, the chromosome no. gets doubled during S phase, so that after the telophase, the no. of chromosomes in each cell remains same.

hence, 20 chromosomes will double to get 40 and hence 20 pair of chromosomes.

but that is not the answer

kindly check the solution. i have edited it.

thank you have a nice day

option c is correct. c is correct

Nucleated RBC are usually not seen in the blood of healthy mammals

nucleated RBC are not seen in blood of healthy mammals. like - dogs

NUCLEATED RBC ARE NOT FOUND IN BIOOD OF HEALTHY MAMMALS. LIKE-DOGS

Due to increase in the use of plastic bags and disposing problems, plastics are creating garbage in the environment. Plastic constitutes about 35 % of garbage in India. As well as while production of plastic factories emits their chemical waste in air, water or soil. thus, creating pollution in the environment. Therefore, to save our environment India should ban plastic bagoceans are also being polluted by the wastage so this will affect the biotic system as well

Chromosomalsexisdeterminedat the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. ... Over the next five weeks, thefetusbegins producing hormones that cause itssexorgans to grow into either male or female organs.

chromosomes determines the sex determination of unborn child

it is a sub metacentric that is having the centromere situated so that onechromosomearm is somewhat shorter than the other.

The answer is option A) Leptotene

The embryo will be about the size of a pea around one month into a pregnancy, Burch said. Around the second month of pregnancy, the embryo has grown to the size of a kidney bean, he explained. In addition, the ankles, wrists, fingers and eyelids form, bones appear, and the genitals and inner ear begin to develop.

After the eighth week of pregnancy and until birth occurs, a developing baby is called a fetus.

(3) is correct option

option 3 , Embryo is correct answer

potion 3 is correct embryo is right

3: embryo. it is the correct answer

3 embryo is right answer

Red blood cells are red in colour, concave and non nucleated, formed in the bone marrow.White blood cells are colourless

as I see you're in 9th grade, so my answer will be up to your level only.

see there is very important need of 3 things in our body. 1. all the nutrients which releases after digestion of the food which we eat, should must be transported to each and every cell of our body.

2. Oxygen is very important source for breakdown of all those substances which our body cells are getting from the food which we eat. so we have to transport the Oxygen to "Each and Every Cell" so that they can do Breakdown properly.

3. we need a guardian angel who can protect our body from our inner side (i.e. an army to fight with disease causing agents inside our body)

so for all these functions, nature has given us BLOOD.

Blood have basically 4 things RBC+WBC+PLATELETS+NUTRIENTS

now approx 5L of blood flows in our body.

now our 4 problems solved-

1. now all cells can easily take all the nutrients from blood directly.

2. RBC is there for transferring of Oxygen to each and every cell of our body.

3. WBC is our that Gurdian Angel, which protects from the disease causing agents.

so this is a basic level answer, you'll get more detail about their structure and functioning in your respective book.

hope it helps, stay curious!

because they kill the girl child if the baby is girl

the incorrect match is option 3Polytene chromosomes are large chromosomes which have thousands of DNA strands. They provide a high level of function in certain tissues such as salivary glands.

Thesexof unborn child depends on whether the zygote formed at the time of fertilisation has XX combination of sex chromosomesor XY combination ofsex chromosomes. It is the sperm of man that determines thesexof the child.This is because half of the sperms have Xchromosomesand other half have Ychromosomes.Autosomes are numbered chromosomes that contain genes for anything that does not relate to sex determination. Humans have 22 pairs of autosomes (or 44 in total) that are numbered 1 through 22. These numbers indicate the size of the autosome. For example, chromosome 1 is the longest, and chromosome 22 is the shortest.

y chromosome can be called as allosome

IV) sex-chromosome is known as y chromosome

forest are also known as

Arteriescarry oxygenated blood away from the heart to the body, andveinscarry oxygen-poor blood back from the body to the heart.

Chromosomalsexis determined at the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. ... Over the next five weeks, thefetus begins producing hormones that cause itssexorgans to grow into either male or female organs.

Ans :- In many species,sex determinationis genetic: males and females have differentalleles or evendifferent genes that specify theirsexualmorphology. In animals this is often accompanied by chromosomal differences, generally through combinations of XY, ZW, XO, ZOchromosomes, or haplodiploidy.

thanks

Thanks to answer! Nice answer! But how did you answered the question? However, you are studying in class 9.

Bloodin yourveinshas very little oxygen and is adark redcolor that looks almost bluewhencovered by your skin. Yourarterieshavebright red bloodbecause it has a lot of oxygen in it that is being carried throughout your body to be used by tissue.

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Arteriescarry oxygenated blood away from the heart to the body, andveins carry oxygen-poor blood back from the body to the heart.

Veins:carry blood from the tissues of the body back to the heartare usually positioned closer beneath the surface of the skinare less muscular than arteries, but contain valves to help keep blood flowing in the right direction, usually toward the heartwould collapse if blood flow stops.

Arteries:carry blood away from the heart to the tissues of the bodyare usually positioned deeper within the bodyare more muscular than veins, which helps in transporting blood that is full of oxygen efficiently to the tissueswould generally remain open if blood flow stopped, due to their thick muscular layer.

THE VALVES ARE PRESENT IN HEART FOR THE REASON THAT TO PREVENT BACK FLOW OF BLOOD AND IN VEINS BECAUSE IT CAN CARRY BLOOD IN ONE DIRECTION

because veins prevents the back flow of blood to heart.

Chromosomes which are involved in determination of sex in the organisms known as Sex chromosomes.

In human beings sex chromosomes are different in males from females.In male sex chromosomes are known as mismatched pairs because they have one normal size called X and other is short in size called as Y chromosome.In female sex chromosomes are perfect pairs because havetwo X chromosomes which are identical to each other.

1)sex determination, the establishment of thesexof an organism, usually by the inheritance at the time of fertilization of certain genes commonly localized on a particularchromosome. 2)This pattern affects the development of the organism by controlling cellular metabolism and stimulating the production of hormones that trigger the development of sexual glands or organs. 3)An excess or lack of hormones during embryological development may cause an individual to develop the superficial appearance of one sex while retaining the genetic constitution of the other sex.