GK
WORLD HISTORY
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Fast ripening rice
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caused new wealth in China
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allowed Song leaders to rebuild the Great Wall
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increased the population greatly
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a and c
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Explanation:
Detailed explanation-1: -Champa rice is a quick-maturing, drought resistant rice that can allow two harvests of sixty days each per growing season.
Detailed explanation-2: -Thus, Champa rice has played important roles in ancient and modern rice production. Many Champa rice accessions are early-maturing and are resistant to biotic and abiotic stresses. They were introduced into China about 1000 years ago when there was drought stress in the rice production area.
Detailed explanation-3: -At the ripening stage of rice the yellowing of leaves begins to develop gradually from the lower part of plant to upward. Several inorganic substances which had been absorbed into the leaves start to translocate from these yellow leaves into grains.
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