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Fossil Record

The fossil record provides a record of how anatomical features of organisms have changed over time. The fossil record also provides evidence for the period of time during which organisms have been present on Earth.

Homologous structures

Homologous structures are organs or bones that are found in different organisms that have similar structures.

Characteristics assist us to trace the evolutionary relationship between organisms. Evolutionary relationships help us to trace who we are more close to and who is our common ancestor.

A group of organisms is similar enough to be thought of together by certain characteristics.

For instance, mammals and reptiles. All of them have four limbs and the basic structure of their organs is similar even though they use it for different functions. Such organs are called homologous organs. This does not mean that they share a common ancestor.

Some organisms appear to be similar but basic designs are different.

For instance, wings of bats and birds. Both of these animals use wings for the same function but they have different basic structures. Such organs are called analogous organs.

Thus, the homologous and analogous characteristics help to trace an evolutionary relationship between different species.

Tiger is the national animal of India.

Explanation:It has been chosen as the National animal due to its grace,strength, agility and enormous power. It is found throughout the country except in the north-western region.

Tiger is national animal of India

After threshing, the moisture content ofgrainsremains generally higher than the desired for safestorageofgrains(13-14%).

Dryingis the phase of the post-harvest system during which the product is rapidlydried untilit reaches the “safe-moisture” level.

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When food is plentiful, manyHydrareproduce asexually by producing buds in the body wall, which grow to be miniature adults and break away when they are mature.

When a hydra is well fed, a new bud can form every two days. When conditions are harsh, often before winter or in poor feeding conditions,sexual reproductionoccurs in someHydra. Swellings in the body wall develop into either ovaries or testes. The testes release free-swimming gametes into the water, and these can fertilize the egg in the ovary of another individual. The fertilized eggs secrete a tough outer coating, and, as the adult dies (due to starvation and/or cold), these resting eggs fall to the bottom of the lake or pond to await better conditions, whereupon they hatch into nymphHydra. SomeHydraspecies, likeH. circumcinctaandH. viridissima, arehermaphrodites[6]and may produce both testes and ovaries at the same time.

Many members of theHydrozoago through a body change from apolypto an adult form called amedusa.

organic farming means to avoid chemical fertiliser and pesticides and instead of them use natural fertilisers and pesticides

) Mendel demonstrated that traits can be either dominant or recessive through his monohybrid cross. He crossed true-breeding tall (TT) and dwarf (tt) pea plants. The seeds formed after fertilisation were grown and the plants that were formed represent the first filial or F1 generation. All the F1 plants obtained were tall. Then, Mendel self-pollinated the F1 plants and observed that all plants obtained in the F2 generation were not tall. Instead, one-fourth of the F2 plants were short. From this experiment, Mendel concluded that the F1 tall plants were not true breeding; they were carrying traits of both short height and tall height. They appeared tall only because the tall trait was dominant over the dwarf trait. This shows that traits may be dominant or recessive.

(a) Easy to grow(b)Short lifespan©Easily distinguishable characters(d)Larger size of flower(e)Self pollinated

Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance . He deduced that genes come in pairs and are inherited as distinct units, one from each parent. Mendel tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.

Chromosomalsexisdeterminedat the time of fertilization; a chromosome from the sperm cell, either X or Y, fuses with the X chromosome in the egg cell. Gonadalsexrefers to the gonads, that is the testis or ovaries, depending on which genes are expressed

1. Gregor Mendel

Father of Genetics.Gregor Mendel, through his work on pea plants, discovered the fundamental laws of inheritance. He deduced that genes come in pairs and are inherited as distinct units, one from each parent.2. Thescientific name of the planton which Gregor JohannMendel carried outhisexperimentsis Pisum sativum .It is commonaly known as peaplant. In hisexperimentshe has taken seven contrasting characters of the peaplantandcarried outhisexperimentson year.

14.chloro floro carbon

choloro floro carbon

joule's law in hindi) जूल का नियम क्या है , सूत्र , चित्र , ऊष्मा : जब किसी विद्युत परिपथ से विद्युत धारा प्रवाहित होती है तो इलेक्ट्रान और परिपथ के कणों के मध्य टकराव होता है जिससे परिपथ में ऊष्मा उत्पन्न हो जाती है इसे जूल का नियम कहते है , यही कारण होता है कि जब किसी विद्युत तार से धारा प्रवाहित होती है या ...

joule'slaw in hindi)जूलकानियमक्या है , सूत्र , चित्र ,ऊष्मा: जब किसी विद्युत परिपथ से विद्युत धारा प्रवाहित होती है तो इलेक्ट्रान और परिपथ के कणों के मध्य टकराव होता है जिससे परिपथ मेंऊष्माउत्पन्न हो जाती है इसेजूलकानियमकहते है , यही कारण होता है कि जब किसी विद्युत तार से धारा प्रवाहित होती है या ...

Rhizobacterium , Acetobacter , Azospirilium are the microbes present in leguminous plants.

As mixed crop is associated with betel and green manure is associated with plant leaves and root nodules is associated with legume plants;

Option c is correct.

thanks byyaaa

Lets say that RR is a gene for dominant trait and rr is a gene for recessive trait.

(a) The gene of the parent with dominant trait is RR and parent with recessive trait is rr.

(b) When we cross both the parents (RR X rr) we get all progenies with round seeds.

(c) Cross between two of the F1 progenies is known as second filial cross and produce F2 progenies.

In this case by crossing two of the F1 progenies (Rr X Rr) we will get following ratio of F2 progenies.F2 generation-- Genotypic ratio :-1:2:1 (1 progeny with RR gene, 2 progenies with Rr gene and 1 progeny with rr trait).Phenotypic ratio:- 3:1 (3 progenies with round seeds and 1 progeny with wrinkled seed).

Changein polarity ofACsignal always double the It's frequency of oscillations, because foronecompletecycle ACsignal undergoesonepositive andonenegative halfcycles. i.eonepositive and negative polarities. For a 50 Hz sine wave,it undergoes 100 times polaritychangesover acycle.

Cathode1. The electrode at which reduction takes place2. It is negative terminal3. Negative ions are deposited as atoms by gaining electrons.

Anode1. The electrode at which oxidation takes place2. It is positive terminal3. Atoms are liberated as positive ions by losing electrons

Whena fieldisleft uncultivatedfor a while so that soil recovers its fertility, it is generally called as a fallow land.

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The sources which are originally obtained from nature called as natural resource. example. light or heat obtained from sun

An material is directly obtained from the nature are known as natural resource

Natural resources are resources that exist without actions of humankind. This includes all valued characteristics such as magnetic, gravitational, electrical properties and forces, etc.

Any kind of resource that is untouched by human beings that is it is virgin and has been originated from nature are called natural resourcesExample - Fossil fuels

Natural resources are resources that exist without actions of humankind. This includes all valued characteristics such as magnetic, gravitational, electrical properties and forces etc.

THE RESOURCES WHICH IS OBTAINED FROM NATURE IS CALLED NATURAL RESOURCES. EXAMPLE =LIGHT, WATER ETC.

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The process of converting N2 into biologically available nitrogen is called nitrogen fixation.

B Option is the answerWhensugaris dissolved in water, thesolutiondoes notconduct electricity, because there are no ions in thesolution. Some substances that are made of molecules form solutions that doconduct electricity. Ammonia is such a substance. When ammonia dissolves in water, it reacts with the water and forms a few ions.

The amount of volume which is stored in alveoli of lungs and not taking part in inspiration and expiration are the inspiratory reserve volume

It is the Volume in addition to tidal volume that enters lungs during forced inspiration

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Bacteria multiplyin a straightforward manner. Each single celled bacterium grows until there is enough material to form two separatebacteria. The one parent bacterium then splits into two progenybacteria. This process is known as binary fission.

The sericin isremoved by placingthe cocoons in hot water, which frees the silkfilaments and readies them for reeling. This is known as the degumming process. The immersion inhot wateralso kills the silkworm pupa.

The sericin isremoved by placingthe cocoons in hot water, which frees the silkfilaments and readies them for reeling. This is known as the degumming process. The immersion inhot wateralso kills the silkworm pupa.

Theimportanceofforestscannot be underestimated. We depend onforestsfor our survival, from the air we breathe to the wood we use. Besides providing habitats for animals and livelihoods for humans,forestsalso offer watershed protection, prevent soil erosion and mitigate climate change.

Bloodis a suspensionof bloodelements (erythrocytes, leukocytes, and platelets) inbloodplasma.

Bloodplasma, making up the liquid portionof blood, is a colloid solutionoforganic and inorganic substances (electrolytes, nutrients, proteins, hormones etc.) with an additionofdissolvedbloodgases.

Tendons connect muscleto bone. These tough, yet flexible, bands of fibrous tissueattachtheskeletal musclesto the bones they move. Essentially,tendonsenable you to move; think of them as intermediaries betweenmusclesand bones.

tendons connect muscles to bones and are type of connective tissue

The tendon is connective tissue which connect muscles to the bone.

Contractile proteins of muscle are actin and myosin, the main components of the thin and thick filaments, respectively. ... Troponin has three subunits: TnT, which binds to tropomyosin; TnC, which binds calcium; and TnI, which inhibits the actin–myosin interaction

The two contractile protein is present in skeletol muscle is actin and myosin. Actin is thin filament which is also called isotropic and myosin is thick filament which is also called anisotropic. Actin protein has globular protein and over it is a antiparallel sequence goes into this protein is called tropomyosin. Myosin protein has tail region and head region. Tail region of myosin is called heavymeromyosin and head region of myosin is called heavymeromyosin. In the head region of myosin a specific type of binding site is present is called active site. And another site is present is called Atp site where by the process of phosphorylation the atp gave own phosphate due to this whole process of mechanisms of contraction and relaxation.

option b is the right answer.

Option c is correct anser

option c irritability

(c) options irritability

c is correct answer......

c. Irritability is the correct answer

option d).by my choice is correct within a few days they will observe that the number of cockroaches has been increased

Osmoregulationis the passive regulation of theosmotic pressureof anorganism'sbody fluids, detected byosmoreceptors, to maintain thehomeostasisof the organism'swatercontent; that is, it maintains thefluid balanceand theconcentrationofelectrolytes(saltsinsolution) to keep the fluids from becoming too diluted or concentrated. Osmotic pressure is a measure of the tendency of water to move into onesolutionfrom another byosmosis. The higher the osmotic pressure of a solution, the more water tends to move into it. Pressure must be exerted on thehypertonicside of a selectively permeablemembraneto preventdiffusionof water by osmosis from the side containing pure water.

Coagulation, also known asclotting, is the process by whichbloodchanges from a liquid to a gel, forming ablood clot. It potentially results inhemostasis, the cessation of blood loss from a damaged vessel, followed by repair. The mechanism of coagulation involves activation, adhesion, and aggregation ofplateletsalong with deposition and maturation offibrin. Disorders of coagulation are disease states which can result in bleeding (hemorrhageorbruising) or obstructive clotting (thrombosis).

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(Curie,)👈 is the correct answer because a lady scientist madam Curie invented radioactivity, for this invention she got Nobel prize.

Thanks for the info

Please give answer for the other

option B is the answer

curie is the answer

To prevent accidents,wearrubber boots and insulated rubbergloves, shoes with insulated soles, protective garments, and safety goggles.

When working with electricity, it's best to use a wooden or fiberglass ladder versus steel or aluminum.

Nose, the prominent structure between the eyes that serves as the entrance to the respiratory tract. Used to take oxygen

The nose is the body's primary organ of smell and also functions as part of the body's respiratory system. Air comes into thebodythrough the nose. As it passes over the specialized cells of the olfactory system, the brain recognizes and identifies smells. Hairs in the nose clean the air of foreign particles

1.respiratory 2.smell

The nose is the body's primary organ of smell and also functions as part of the body's respiratory system.