Question

Section-11
Study-based questions are compulsory. Attempt any four sub-parts from each question. 01X04=04
ech sub-part carries 1 mark.
No.
Case Study Based-1
Kerala is a state in Sothern India. The state known
as a tropical paradiseof waving palms and wide
sandy beaches. This map of the Indian province of
Kerala shows its area can be approximated using a
simple straight-sided shape. The shape has two
parallel sides 561 km and 216 km long. The other
sides are 180 km and 211 km long. Its parallel sides
are 100 km apart. Shreya observed the shape
formed by four straight lines and explored it on her
notebook in different ways shown below.
A
B
2
2,4
62.5
94-3
1820-t
F
F.
R р
5x-3
3xito
2013
30-1
CB
C С
E
F
Shape-1
Shape-11
Refer to Shape 1
(i) Let ABCD is a trapezium with AB||CD, E and F are points on non-parallel
AE
sides AD and BC respectively such that EF is parallel to AB. Then
ED
AB
(a)
(b)
(c)
(d) None of these.
Here, AB||CD, if DO=3x-19, OB=-x-5, CO=x-3 and AO=3, the value of x is
(a) 5 or 8 (b) 8 or 9
(c) 10 or 12 (d) None of these
BF
BF
CD
CD
EC
Again, AB||CD, if DO=3x-1, OB=-5x-3, AO=6x-5 and OC=2x+1, the value of x
is
(a) o
(b) 1
(c) 2
(d) 3
Refer to Shape II
(iv) In AABC, PQ||BC. If AP=2.4 cm, AQ=2 cm, QC=3 cm and BC=6 cm, AB and
PQ are respectively
(a) AB=6 cm, PQ=2.4 cm
(c) AB=4 cm, PQ=5.3 cm
(b) AB=4.8 cm, PQ=8.2 cm
(d) AB=8.4 cm, PQ=2.8 cm
(v) In ADEF, if RS||EF, DR=4x-3, DS=8X-7, ER=3x-1 and FS=5x-3, then the value
of x is
(a) 1
(b) 2.
(c) 8
(d) 10
Case Study Based-2
Saving Money
Saving money is a good habit for everyone. It helps you in the event of financial
emergency. Some children of Class-X decided to save their pocket money. The
following distribution shows their daily pocket allowance.
2. No. 18.
01X04504​

Answer 1

Answer:

An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. ... Ecosystems can be very large or very small.

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