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NCERT Exemplar Solutions Class 7 Science Solutions for Transportation in Animals and Plants - Exercise in Chapter 11 - Transportation in Animals and Plants

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Question 22 Transportation in Animals and Plants - Exercise
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Fill in the blanks of the following paragraph using just two words – arteries and veins. ___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b) carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c) have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)__. Valves are present in __ (f) ___ which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ____ (h)___.

Answer:

a)Arteries carry oxygen-rich blood from the heart to all parts of the body and b)veins carry carbon dioxide-rich blood from all parts of the body back to the heart. c)Veins have thin walls and d)arteries have thick elastic walls. Blood flows at high pressure in e)arteries. Valves are present in f)veins which allow blood to flow only towards the heart. g)Arteries divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form h)veins.

Video transcript
"hello everyone welcome to video this is priya and let us look into the question which are related to isotopes and isobars here is a question write the electronic configuration of any one pair of isotopes and isobar so before knowing about giving about the electronic configuration of any one pair of isotopes and isobar i just want to give you a definition of isotopes and isobar so coming to the definition of iso 2 isotopes are atoms which have the same number of protons but the number of neutrons will be different in an atom so this leads to the variation in the mass of that atom two so what is the meaning of isotope so in an atom the number of protons and number of neutrons are not equal so this will be referred as an isotope so here we are taking an example of carbon atom where exists with the um so so its atomic number is 6 and the mass is 14 but when their electronic configuration is noticed both have two electrons in k shell and four electrons in l shell so carbon molecule exists as when we see the isotope of this carbon molecules they will have 6 atomic number and 14 atomic mass and coming to the configuration of the electrons present in that atom first shell will have two and the second shell will have four and coming to the eyes of bars iso bars coming to the definition of isobars isobars are those atoms which have the same mass but different atomic numbers so the atoms which has same mass they will have same mass but but they are different in their atomic number so atomic number is different so atomic number will be different in isobars so i am giving this example of calcium which has electronic atomic number of 20 and its atomic mass is 40. where the coming to the configuration of this k shell will have two l shell will have eight m shell has eight and n shell has two so one the uh isobar of these calcium is argon which has atomic number of 18 and atomic mass of 40. so coming to the electronic configuration of these isobar is k shall have 2 l shell has m shell has eight okay so these are the examples of isobar here one one thing we have to find is their atomic number are different but their atomic mass is same so they will be considered as isobars so hope you understand this video if you like my video please subscribe to our leader channel and if you have any doubts you can keep a message in comment box thank you"
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