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CXC HUMAN AND SOCIAL BIOLOGY PAST PAPERS – CYCLES 0

CXC HUMAN AND SOCIAL BIOLOGY PAST PAPERS – CYCLES

Nitrogen is another element which is cycled in nature. Plants use nitrogen in the form of nitrates. a. Explain the role of nitrifying bacteria in making nitrates available to plants. ANSWER The nitrifying bacteria...

2016 JANUARY CXC HUMAN AND SOCIAL BIOLOGY 0

2016 JANUARY CXC HUMAN AND SOCIAL BIOLOGY

Tom has been injured in a football game and the doctor does a knee jerk test. Explain to Tom the mechanism of a knee jerk spinal reflex. ANSWER The stimulus will pass directly from...