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NCERT Exemplar Solutions Class 7 Science Solutions for Forests: Our Lifeline - Exercise in Chapter 17 - Forests: Our Lifeline
Question 1 Forests: Our Lifeline - Exercise
Which of the following serves as green lungs?
(a) The green pigment of the plants
(b) Forests
(c) Kitchen gardens
(d) Greenhouse gases
Answer:
The answer is (b) Forests
Explanation:
Plants release oxygen during photosynthesis which is used by all the organisms. Plants help to maintain the concentrations of CO2 and Oxygen Hence they are called as green lungs.
Video transcript
"hi everyone my name is shrisher and
welcome back to another homework session
of lido
let's take a look at today's question
write
t for true and f for false for each of
the given statement
the difference of to perfect square
is a perfect square so what they are
saying is that when you uh subtract to
perfect square you'll always get a
perfect square let's check
if that is true or not let's take two
perfect squares
uh let's find out the perfect square of
3
4 square first which is 16
and then let's find the perfect square
of 3 3 square is 9
so let's subtract 16 and 9 16 and 9 will
give you 7
7 is not a perfect square right not
a perfect
square it is not
a perfect square
now let's take an example of another
let's take one more example
5 square is 25 let's now subtract
25 with 9 so 5
square minus 3 square 5 square
is 25 and 3 square is 9
equals to 16 this is 4 square right now
you are getting
a perfect square this time around we are
getting a perfect square
so what can i conclude from both the
example
sometimes you will get a perfect square
sometimes you will not get a perfect
square
so it is not necessary to get a perfect
square all the time
it can be any number that you will get
all right that is why the given
statement
is false because what they are implying
is that every time you take the
difference of two perfect squares
you'll get a perfect square which is not
necessarily true
so this is false all right so that's it
for this question if you have any doubt
you can drop a comment
and don't forget to like and subscribe
to this channel for regular updates
thank you i'll see you next time
"
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