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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 6401. |
How to analyse the chemical composition of tissues? |
| Answer» The elemental analysis of a cell shows that it is composed of various elements such as carbon, hydrogen, oxygen, chlorine, etc.But what do these elements constitute? What are the properties of the compounds formed by these elements?Only a chemical analysis can answer these questions.Analytical techniques provide information regarding different compounds (organic and inorganic), their molecular formula and structures. They also help us to isolate and purify one compound from another.Here is a simple experiment to find the\xa0Chemical Composition Analysis in Biomolecules.Take a piece of living tissue and crush and mix it with an acid. After its filtration, we obtain two portions. The fraction which is obtained as filtrate is acid-soluble portion while the other fraction is acid-insoluble, which retain on the filter membrane. This shows that within the\xa0tissues, there two or more compounds which have distinct properties.Take another piece of tissue and burn it, once all the water in it is evaporated. All carbon compounds will be oxidized on burning. The left out ash gives us the inorganic compounds like calcium, magnesium, sulfate, phosphate, etc., in the tissue. | |
| 6402. |
How many present have a protein of plasma? |
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Answer» I think 3 is incorrect 2 Jibika ligira 3 |
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| 6403. |
Longest cell...? |
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Answer» Nerve cell Neurons or nerve cells can be up to 3 feet long. A typical neuron has a cell morphology called soma, hair-like structures called dendrites and an axon. Neurons are specialized in conveying knowledge throughout the body. The sensory neurons, motor neurons, and interneurons are three types of neurons. Neurons have a membrane built to forward information to other cells. Nerve cell or neuron |
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| 6404. |
How are animal of plathyheminthus difference from those of annelida |
| Answer» \tAnnelidaPlatyhelminthesDorsoventrally flattenedBody divided into small ringsAppendages (for locomotion) are absentAppendages are absentGanglia are absentNervous system contains gangliaTrue body cavity is presentTrue body cavity is absentHave segmented bodyDo not have segmented bodyNephridia are organs of excretion in the annelidsProtonephridia are organs of excretion in platyhelminthesExample - EarthwormExample - Flatworm\t | |
| 6405. |
Cell theory and discovery |
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Answer» Thanks for answer so perfect CELL THEORY\tSchleiden and Schwann together formulated the cell theory.\tRudolf Virchow (1855) first explained that cells divided and new cells are formed from pre-existing cells.\tCell theory states that\tAll living organisms are composed of cells and products of cells.\tAll cells arise from pre-existing cells. Hii sis |
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| 6406. |
Who discovered mitochondria |
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Answer» Kolliker Mitochondria was first observed by Kolliker in (1857) while the name "mitochondrion" , was given by Benda (1898). What is kolliker\'s contribution The discovery of mitochondria is accredited to the several scientists who contributed to the discovery of mitochondrion and identification of its structure and functions. The earliest accounts of description of mitochondria go back to 1840. However, Richard Altmann was the first one to recognize the occurrence of these organelles and called them bioblasts. The name mitochondria was coined by Carl Benda in 1898. Christian de Duve was a Belgian researcher who discovered lysosomes in 1949. |
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| 6407. |
What is ales ???????? |
| Answer» The suffix used for plant order is -ales in other words the name of the plant order ends with ales | |
| 6408. |
Kolliker\'s contribution in cell |
| Answer» \tThe mitochondria is a double-membraned cell organelle, known as the powerhouse of the cell which is present in all eukaryotic cells.\tIt was first discovered by Albert von Kolliker in the year 1857.\tIt was named as bioblast by Richard Altman in the year 1886.\tThe term mitochondria was coined by Carl Benda in the year 1898.\xa0 | |
| 6409. |
What is biology....?? |
| Answer» Branch of science . Corona needs to be as big as a human so that everyone can take their revenge from it. | |
| 6410. |
ATP kha hoti h carbohydrates , lipid , protein , etc |
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Answer» Most of the\xa0ATP\xa0in cells is produced by the enzyme\xa0ATP\xa0synthase, which converts ADP and phosphate to\xa0ATP.\xa0ATP\xa0synthase is\xa0located\xa0in the membrane of cellular structures called mitochondria; in plant cells, the enzyme also is\xa0found\xa0in chloroplasts. ATP(Adenosine Triphosphate) is the energy currency |
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| 6411. |
Explain the mechanism of blood clotting? |
| Answer» \tBlood coagulation or clotting is the mechanism to prevent excessive loss of blood from the body.\tReddish brown scum formed at the site of a cut is due to clot formed mainly of a network of threads called\xa0fibrins\xa0in which dead and damaged formed elements of blood are trapped.\tFibrins are formed by the conversion of inactive fibrinogens in the plasma by the enzyme thrombin.\tThrombins are formed from another inactive substance present in the plasma called\xa0prothrombin\xa0by an enzyme complex known as\xa0thrombokinase.\tCalcium ions play a very important role in clotting. | |
| 6412. |
What is cardiac cycle? Explain the stroke volume. |
| Answer» \tThe sequential event in the heart which is cyclically repeated is called the cardiac cycle and it consists of systole and diastole of both the atria and ventricles.\tDuration of a cardiac cycle is 0.8 seconds.\tDuring a cardiac cycle, each ventricle pumps out approximately 70 mL of blood which is called the\xa0stroke volume.\tThe stroke volume multiplied by the heart rate gives the\xa0cardiac output.\tCardiac output can be defined as the volume of blood pumped out by each ventricle per minute and averages 5000 mL or 5 litres in a healthy individual.\tAs the tricuspid and bicuspid valves are open, blood from the pulmonary veins and vena cava flows into the left and the right ventricle respectively through the left and right atria and the semilunar valves are closed at this stage.\tThe SAN now generates an action potential which stimulates both the atria to undergo a simultaneous contraction – the\xa0atrial systole.\tThe action potential is conducted to the ventricular side by the AVN and AV bundle from where the bundle of HIS transmits it through the entire ventricular musculature, which causes the ventricular muscles to contract, (ventricular systole), the atria undergoes relaxation (diastole), coinciding with the ventricular systole.\tVentricular systole increases the ventricular pressure causing the closure of tricuspid and bicuspid valves.\tAs the ventricular pressure increases further, the semilunar valves guarding the pulmonary artery (right side) and the aorta (left side) are forced open, allowing the blood in the ventricles to flow through these vessels into the circulatory pathways.\tThe ventricles now relax (ventricular diastole) and the ventricular pressure falls causing the closure of semilunar valves which prevents the backflow of blood into the ventricles.\tAs the ventricular pressure declines further, the tricuspid and bicuspid valves are pushed open by the pressure in the atria exerted by the blood which was being emptied into them by the veins and the blood now once again moves freely to the ventricles, leading the ventricles and atria again in a relaxed (joint diastole) state.\tAgain, the SAN generates a new action potential and the events are repeated.\tDuring each cardiac cycle two prominent sounds are produced which can be easily heard through a stethoscope.\tThe first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves, whereas the second heart sound (dub) is associated with the closure of the semilunar valves. | |
| 6413. |
Human circulatory system is double circulation. Justify |
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Answer» Because blood comes in heart two times Yes |
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| 6414. |
Write a detailed note on disorders of circulatory system. |
| Answer» 4 Disorders Of The Circulatory System are as listed below:\tCoronary artery disease (CAD) – also referred to as atherosclerosis, it affects the vessels supplying blood to the heart muscles.\tHeart failure – in this state of the heart, blood is not being pumped effectively to fulfil the needs of the body. One of the main symptoms of this disease is the lung-congestion hence it is also referred to as congestive heart failure\tAngina – it is a symptom of acute chest pain surfaces when there is a dearth of oxygen supply to the muscles of the heart.\tHigh blood pressure (hypertension) – is a condition where the blood pressure is higher than the normal blood pressure (120/80). | |
| 6415. |
How does human heart activity monitored ? Explain with P,Q,R,S &T wave complex. |
| Answer» Our nerve and muscle cells communicate with each other using electrical and chemical signals. Regular electrical signals also control our heartbeat. These signals are sent by a group of cells in the right atrium of the heart known as the sinoatrial node (SA node), and they spread through the heart muscle tissue as tiny electrical impulses. This causes first the atria and then the ventricles of the heart to contract. The way that these signals spread through the heart can also be measured on the surface of our skin. An ECG measures these changes in electrical signals (or, in fact, voltage) on different areas of skin and plots them as a graph. The resulting ECG graph is called an electrocardiogram. | |
| 6416. |
Explain the function of human heart? |
| Answer» \tThe arteries receive oxygenated blood from the heart and supply it throughout the body. Whereas, the veins carry the deoxygenated blood from all the body parts to the heart for oxygenation.\tThe right atrium receives blood from the veins and pumps it to the right ventricle.\tThe right ventricle pumps the blood received from the right atrium to the lungs.\tThe left atrium receives oxygenated blood from the lungs and pumps it to the left ventricle.\tThe left ventricle pumps the oxygenated blood throughout the body. | |
| 6417. |
Describe the structure of human heart? |
| Answer» Structure of Human Heart\tThe heart is a muscular organ covered by a double membrane called pericardium.\tThe pericardial fluid of the pericardium lubricates the heart.\tThe heart is divided into four chambers — two upper atria and two lower ventricles.\tThe inter-atrial septum separates the two atria and the inter-ventricular septum separates the two ventricles.\tThe atrium and the ventricle of each side are separated by the atrioventricular septum.\tSuperior and inferior vena cavae open into the right atrium.\tThe right ventricle opens into the pulmonary artery.\tFour pulmonary veins open into the left atrium.\tThe left ventricle opens into the aorta.\tThe opening between the right atrium and right ventricle is guarded by the tricuspid valve.\tThe opening between the left atrium and left ventricle is guarded by the bicuspid (mitral) valve.\tThe opening of the right ventricle into the pulmonary artery and the opening of the left ventricle into the aorta is guarded by the semilunar valves. | |
| 6418. |
What is meant by origin of heart beats? Explain the conducting system of heart beats? |
| Answer» Heart beat is the rhythmic contraction and relaxation of the heart. Each heart beat includes one systole (contraction phase) and one diastole (relaxation phase) of the heart to distribute and receive blood to and from the body. The heart of a healthy person beats 72 times per minute. Origin of heart beat. The mammalian heart is myogenic (myo = muscle, genic = originating from). It means the heart beat originates from a muscle, (however, it is regulated by the nerves). The heart beat originates from the sinoatrial node (SANode)—pace maker, which lies in the wall of the right atrium, near the opening of the superior vena cava. The SA node is a mass of neuromuscular tissue.Conduction of heart beat. Another mass of neuromuscular tissue, the atrio-venticular node (AV node) is situated in the wall of the right atrium. The AV node picks up the wave of contraction propagated by SAnode. Amass of specialized fibres, the bundle of His, originates from the AV node. The bundle of His divides into two branches, one going to each ventricle. Within the myocardium of the ventricles the branches of bundle of His divide into a net work of fine fibres called the Purkinje fibres. The bundle of His and the Purkinje fibres convey impulse of contraction from the AV node of the myocardium of the ventricles. | |
| 6419. |
Write about hypothyroidism? |
| Answer» Hypothyroidism is a disorder in which thyroid gland is underactive and does not produce or release enough thyroid hormones or thyroxin.As the metabolism continues to slow down, signs and symptoms develop. Here are a few signs and symptoms of hypothyroidism:\tFatigue.\tWeight gain with high cholesterol.\tMemory problems.\tCoarse and pale skin.\tCoarse and dry hair with hair loss.\tCold intolerance.\tMuscle cramps with frequent muscle aches.\tFrequent constipation.\tDepression.\tIrritability. | |
| 6420. |
What do you understand by means of blood grouping? DiscussClass 11 |
| Answer» \tTwo blood groupings are done\tABO and\tRhABO grouping\tABO grouping is based on the presence or absence of two surface antigen on the RBCs namely A and B.\tThe plasma of different individuals contains two natural antibodies.\tThe distribution of antigens and antibodies in the four groups of blood, A, B, AB and O.\tThe blood of a donor has to be carefully matched with the blood of a recipient before any blood transfusion to avoid severe problems of clumping, which leads to destruction of RBC.\tGroup ‘O’ blood can be donated to persons with any other blood group and hence ‘O’ group individuals are called ‘universal donors’.\tPersons with ‘AB’ group can accept blood from persons with AB as well as the other groups of blood, and such persons are called ‘universal recipients’.Rh grouping\tThe Rh antigen similar to one present in Rhesus monkeys is also observed on the surface of RBCs of majority of humans, hence the antigen is known as Rh antigen.\tThe individuals having Rh antigen are called\xa0Rh positive (Rh+ve)\xa0and those in whom this antigen is absent are called\xa0Rh negative (Rh-ve).\tAn Rh-ve person, if exposed to Rh+ve blood, will form specific antibodies against the Rh antigens, and hence Rh group should also be matched before transfusions.\tA special case of Rh incompatibility has been observed between the Rh-ve blood of a pregnant mother with Rh+ve blood of the foetus , which leads to a disease known as\xa0erythroblastosis foetalis.\tRh antigens of the foetus do not get exposed to the Rh-ve blood of the mother in the first pregnancy as the two bloods are well separated by the placenta, during the delivery of the first child, maternal blood may get exposed to small amounts of the Rh+ve blood from the foetus and the mother starts preparing antibodies against Rh in her blood.\tIn case of subsequent pregnancies, the Rh antibodies from the mother (Rh-ve) can leak into the blood of the foetus (Rh+ve) and destroy the foetal RBCs, which cause severe anaemia and jaundice to the baby leading to a condition known\xa0erythroblastosis foetalis.\tErythroblastosis foetalis can be avoided by administering anti-Rh antibodies to the mother immediately after the delivery of the first child. | |
| 6421. |
How many heart\'s chambers in cockroach..?? |
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Answer» 3 Cockroaches are pests inhabiting the unhygienic and damp places. They are dark brown in colour belonging to the phylum Arthropoda, the Blattidae family, and class Insecta.Cockroaches have\xa013\xa0chambered hearts. 3 chambers are present in the thorax and 10 in the abdomen. Ok thanks Cockroach doesn\'t have a heart . They have OCS (open circulatory system) |
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| 6422. |
What is cardiac cycle ? Explain the stroke volume.Class 11 |
| Answer» \tThe sequential event in the heart which is cyclically repeated is called the cardiac cycle and it consists of systole and diastole of both the atria and ventricles.\tDuration of a cardiac cycle is 0.8 seconds.\tDuring a cardiac cycle, each ventricle pumps out approximately 70 mL of blood which is called the\xa0stroke volume.\tThe stroke volume multiplied by the heart rate gives the\xa0cardiac output.\tCardiac output can be defined as the volume of blood pumped out by each ventricle per minute and averages 5000 mL or 5 litres in a healthy individual.\tAs the tricuspid and bicuspid valves are open, blood from the pulmonary veins and vena cava flows into the left and the right ventricle respectively through the left and right atria and the semilunar valves are closed at this stage.\tThe SAN now generates an action potential which stimulates both the atria to undergo a simultaneous contraction – the\xa0atrial systole.\tThe action potential is conducted to the ventricular side by the AVN and AV bundle from where the bundle of HIS transmits it through the entire ventricular musculature, which causes the ventricular muscles to contract, (ventricular systole), the atria undergoes relaxation (diastole), coinciding with the ventricular systole.\tVentricular systole increases the ventricular pressure causing the closure of tricuspid and bicuspid valves.\tAs the ventricular pressure increases further, the semilunar valves guarding the pulmonary artery (right side) and the aorta (left side) are forced open, allowing the blood in the ventricles to flow through these vessels into the circulatory pathways.\tThe ventricles now relax (ventricular diastole) and the ventricular pressure falls causing the closure of semilunar valves which prevents the backflow of blood into the ventricles.\tAs the ventricular pressure declines further, the tricuspid and bicuspid valves are pushed open by the pressure in the atria exerted by the blood which was being emptied into them by the veins and the blood now once again moves freely to the ventricles, leading the ventricles and atria again in a relaxed (joint diastole) state.\tAgain, the SAN generates a new action potential and the events are repeated.\tDuring each cardiac cycle two prominent sounds are produced which can be easily heard through a stethoscope.\tThe first heart sound (lub) is associated with the closure of the tricuspid and bicuspid valves, whereas the second heart sound (dub) is associated with the closure of the semilunar valves. | |
| 6423. |
Human circulatory system is double circulating. Justify.Class 11 |
| Answer» The double circulation of blood includes:(i) Systematic Circulation(ii) Pulmonary CirculationSystematic Circulation\tSystemic circulation transfers oxygenated blood from left ventricles to capillaries in the tissue.\tThe oxygen-rich blood is passed to the aorta for distribution into various body sections.\tThe veins and venules later absorb the deoxygenated blood which is rich in carbon dioxide from different parts of the body.\tThe deoxygenated blood is transferred back to the superior vena cava, then on to the right atrium.\tThe right atrium transports blood to the right ventricle for pulmonary circulation, after receiving the deoxygenated blood.Pulmonary Circulation\tThe distribution of blood starts in the pulmonary circulation from the right atrium to the left atrium.\tThe pulmonary artery receives the blood from the right ventricle and carries to the lungs for oxygenation.\tWhen the oxygenated blood is pumped back to the left atrium via the pulmonary vein, that is brought to the left ventricles, after the purification process.It is necessary for a human being to separate oxygenated and de-oxygenated blood because this makes their circulatory system more efficient and helps in maintaining constant body temperature. | |
| 6424. |
Write detailed note on disorders of circulatory systemClass 11 |
| Answer» \tHigh Blood Pressure:\xa0\tThe pressure which is created by the blood flow on the wall of blood vessels. In humans, the normal range of blood pressure is 120/80. In this range, 120 is the systolic blood pressure and 80 is the diastolic blood pressure.\tSystolic blood pressure – It is defined as the pressure that is created in the arteries when blood flows through arteries to the rest of the body when the heartbeats.\t\tCoronary Artery Disease (CAD)Coronary artery disease is also termed as atherosclerosis.\xa0Coronary Artery Disease\xa0is the disease which is caused by the deposition of waxy substances in the blood vessels which supplies the blood to the heart muscle and this deposition leads to the blockage of the blood flow. The examples of waxy substances are fat, cholesterol and fibrous tissues. As a result, it may also cause a heart attack.\tAngina\tAngina is the condition in which chest pain occurs if the heart receives insufficient oxygen and nutrients through the\xa0blood vessels. Angina could be caused by the different risk factors. These factors are as follows:\t\tSmoking.\tAge factor (More than 40 age).\tHypertension.\tObesity.\tPhysical inactivity. | |
| 6425. |
How does human heart activity monitored? Explain with P,Q,R,S and T wave complexClass 11 |
| Answer» The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the\xa0atria. The P wave should be upright in lead II if the action potential is originating from the SA node.\xa0ECG – A Pictorial Primer. Atrial and ventricular depolarization and repolarization are\xa0represented\xa0on the ECG as a series of\xa0waves: the\xa0P wave\xa0followed by the\xa0QRS\xa0complex and the\xa0T wave. The first deflection is the\xa0P wave\xa0associated with right and left atrial depolarization. ... The second\xa0wave\xa0is the\xa0QRS\xa0complex. | |
| 6426. |
Discribe the heart sound |
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Answer» The heart sound are mainly of two types : lub and dub.* The first heart sound is called lub . It is associated with the closure of the tricuspid and bicuspid valves.* The second heart sound is called dub . It is associated with the closure of the semilunar valves. It lub dub\xa0It is produced by our heart\xa0 |
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| 6427. |
Which is the largest cell in human body? |
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Answer» Nerve cell The\xa0largest cell\xa0is ovum in the\xa0human body. The ovum also called egg\xa0cell\xa0is the reproductive\xa0cell\xa0in the female\xa0body. Ovum is 20 times\xa0bigger\xa0than the sperm\xa0cells\xa0and has a diameter of about 0.1 mm. Nerve cell Egg cell |
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| 6428. |
Explain the renin angiotensin mechanism stepwise |
| Answer» Renin activates the renin–angiotensin system by cleaving angiotensinogen, produced by the liver, to yield angiotensin I, which is further converted into angiotensin II by ACE, the angiotensin–converting enzyme primarily within the capillaries of the lungs. | |
| 6429. |
Suggest some habitats or natural circumstances in which light intensity |
| Answer» | |
| 6430. |
Can A and A+ve or A negative are same and if different than what is the difference....?? |
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Answer» No they are different because A+blood contain rhesus proteins/factors and A-NOT Containing No they are not same because A + containing rh protein and A - has not rh protein it\'s RBC surface |
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| 6431. |
Anatomy? |
| Answer» Anatomy means field of study | |
| 6432. |
Structure of fungus ?answer seriously |
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Answer» Same here @class11 Dont cry use incognito mode Google locked hae mera yahi to rona hai? |
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| 6433. |
What is uricotelic??? |
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Answer» Hii It is the thing you don\'t know |
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| 6434. |
What is the basis of classification of different animals ? |
| Answer» The\xa0animal\xa0kingdom is\xa0classified\xa0on the\xa0basis\xa0of levels of organisation, body symmetry, germinal layers, nature of coelom, segmentation and presence of notochord. | |
| 6435. |
what is grade of organisation |
| Answer» Grade of organisation refers to the levels in which the cells are arranged. There are different grades of organisation like: Cellular level of organization: It is a loose aggregation of cells in which the cells are functionally different from one another. | |
| 6436. |
What is flowers |
| Answer» Flowers are the reproductive part of plant. | |
| 6437. |
What is a cell pool? |
| Answer» A cell pool is an area of virtual storage that is subdivided into fixed-sized areas of storage called cells , where the cells are the size you specify. A cell pool contains: An anchor. At least one extent. Any number of cells, all having the same size. | |
| 6438. |
What is sacromere and its structure? |
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Answer» Sarcomere is the functional unit of muscle and it\'s structure is given in ncert ???? |
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| 6439. |
How does urine concentrated in nephron. |
| Answer» In the presence of ADH, the medullary collecting ducts become freely permeable to solute and water. As a consequence, the fluid entering the ducts (en route to the\xa0renal\xa0pelvis and subsequent elimination) acquires the\xa0concentration\xa0of the interstitial fluid of the medulla; i.e., the\xa0urine\xa0becomes concentrated | |
| 6440. |
Explain the physiology of nephron. |
| Answer» It\'s given in NCERT,read it. | |
| 6441. |
Describe the structure of nephron. |
| Answer» The nephron is the minute or microscopic structural and functional unit of the kidney. It is composed of a renal corpuscle and a renal tubule. The renal corpuscle consists of a tuft of capillaries called a glomerulus and an encompassing Bowman\'s capsule. ... A healthy adult has 1 to 1.5 million nephrons in each kidney. | |
| 6442. |
Explain the structure of human kidney. |
| Answer» Kidneys\xa0have an outer cortex consisting of dark tissues and an inner medulla consisting of lighter tissues. A funnel-shaped cavity called the\xa0renal\xa0pelvis is present on the concave side of\xa0kidneys. Each\xa0kidney\xa0is made up of millions of microscopic units called nephrons which deal with the formation of urine from blood. | |
| 6443. |
Describe the excretory organs in various organisms. |
| Answer» Insects, centipedes, millipedes and arachnids like scorpion and spider posses Malpighian tubules as their principal excretory organs. In the Malpighian tubules bicarbonates of potassium and sodium, water and uric acid are formed. Spiders and scorpions possess Malpighian tubules and coxal glands both for excretion. | |
| 6444. |
Plant kingdom information |
| Answer» Kingdom Plantae includes all the plants. They are eukaryotic, multicellular and autotrophic organisms. The plant cell contains a rigid cell wall. Plants have chloroplast and chlorophyll pigment, which is required for photosynthesis. | |
| 6445. |
Fill in the column 2and 3 in this table to highlight the difference between C3 and C4 Plants |
| Answer» | |
| 6446. |
Describe mitosis |
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Answer» What is mycoplasma Thanks Aryan The division of a cell of the body that results in two cells, each with the same number of chromosomes as the original cell. |
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| 6447. |
What is the right time to study bio |
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Answer» The right time is ? night Ok bro Morning time ? |
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| 6448. |
Telo phase is reverse of prophasw |
| Answer» Ya it\'s correct | |
| 6449. |
Write the role melatonin hormone in human body. |
| Answer» Functions of Melatonin Hormone -It plays an influential role in the regulation of sleep cycles. -It plays a role in regulating the female menstruation cycle.-Melatonin hormone has a significant effect in affecting circadian rhythms and integrating photoperiod.-It also has a significant effect on reproduction and other phenomena showing circadian rhythm.-This hormone is also helpful for children with developmental disabilities such as ADHD and autism. -It is often considered to be the body’s natural pacemaker, as it plays an instrumental role in signalling time of day and time of year, helping to regulate your body’s internal clock. | |
| 6450. |
Formula for dog teeth |
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Answer» Bbb ¿¿¿¿¿¿????¿??????¿¿¿¿?¿¿ |
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