Question

A trace element essential for plant growth and radioactive isotope which is used in cancer therapy is known as

• A. Calcium
• B. Iron
• C. Cobalt
• D. Sodium

Hint:

Cobalt-60 is an important radioactive isotope used in medical radiotherapy.

Answer 1

The Correct Option is C

Step 1: Trace elements are required by plants in very small quantities for normal growth and development.
Step 2: Cobalt is a micronutrient essential for nitrogen fixation in leguminous plants.
Step 3: The radioactive isotope cobalt-60 is widely used in cancer radiotherapy for treating malignant tumors. Hence, the correct answer is cobalt.