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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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In a tall tree, which force is responsible for pulling water and minerals from the soil?
(a) Gravitational force
(b) Transportation force
(c) Suction force
(d) Conduction force
Answer:
The answer is (c) Suction force
Explanation:
Roots absorb water and minerals from the soil continuously. Evaporation of water from leaves creates a suction force which causes the water to move upwards.
Video transcript
"hello everyone welcome to little this is
priya and here we have a question about
valencia of electrons
so let us look into this the question is
number of valency electrons
in chlorine ion r
option a 16 option b 8
option c 17 option d 18.
so coming to the answer of this question
is
8 so how i will explain you as
you know electronic distribution of
chlorine atom will be
like this follows so in k shell
there will be 12 in k shell
l has 8 m
has 7 so this is the distribution of
chlorine atom chlorine electrons
in the atom so valencia electrons are 7
hence
chlorine gains chlorine is ready to gain
one electron for the formation of
chlorine atom so
hence the valency is eight
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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