Match List-I with List-II
Choose the correct answer from the options given below:
Show Hint
Remember that Carbon-14 was the key tracer used to discover the Calvin cycle in photosynthesis (D-II).
Phosphorus-32 is the classic tracer used to study root activity and fertilizer uptake (A-IV).
Matching these two instantly guides you to the correct option.
Step 1: Understanding the Concept:
Radioactive isotopes emit ionizing radiation (such as alpha, beta, or gamma rays) and are widely used in agricultural research as tracers to monitor biochemical pathways or as mutagenic agents to induce genetic diversity. Step 2: Detailed Explanation:
Let us match the isotopes with their specific agricultural applications:
- (A). Phosphorus-32: This is a beta-emitting radioactive isotope of phosphorus.
It is widely used as a radiotracer in soil science to determine the efficiency of fertilizer application, root distribution patterns, and the rate of phosphorus uptake by plants.
Thus, (A) matches with (IV).
- (B). Cobalt-60: This is a strong gamma-ray emitting isotope.
It is used in specialized "gamma gardens" or radiation chambers to irradiate seeds and plant tissues.
This induces physical genetic mutations, establishing a baseline for mutation breeding.
Thus, (B) matches with (I).
- (C). Cesium-137: This isotope also emits strong gamma radiation.
It is widely utilized in industrial food irradiation facilities to sterilize pests, inhibit sprouting, and extend shelf life during food preservation.
Thus, (C) matches with (III).
- (D). Carbon-14: This is a long-lived beta-emitting isotope of carbon.
It was famously used by Melvin Calvin to trace the path of carbon assimilation during the light-independent reactions of photosynthesis.
Thus, (D) matches with (II).
This gives the matching sequence: (A) - (IV), (B) - (I), (C) - (III), (D) - (II). Step 3: Final Answer:
The correct matching sequence is (A) - (IV), (B) - (I), (C) - (III), (D) - (II).
