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Question 221
A
leaves reduced to spines 
B
poor development of roots and xylem tissues 
C
waxy cuticle on shoot surface 
D
well developed roots and supporting system 
Explanation.
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No official Explanation yet!


Correct Option:
B
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Question 222
A
80% 
B
60% 
C
20% 
D
40% 
Explanation.
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No official Explanation yet!


Correct Option:
D
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Question 223
A
ecosystem 
B
population 
C
biosphere 
D
niche 
Explanation.
Share Answer The biosphere is the global sum of all ecosystems. The two joined words are "bio" and "sphere". It can also be termed as the zone of life on Earth, a closed system, and largely self-regulating.

Correct Option:
C
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Question 229
A
catch insects 
B
attract mates 
C
defend their territory 
D
frighten enemies 
Explanation.
Share Answer Male anoles have a retractable gular fold that is used to attract mates and to chase off rivals.

Correct Option:
B
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