whats the difference between yield and curve sensitivity.

please explain in details

Q. For a long-term, zero-coupon bond, which of the following factors contributes to heightened difference between the bond's yield convexity and curve convexity? A. A flat yield curve B. A price at or near par C. A long time to maturity Solution C is correct. The difference between a zero-coupon bond's yield convexity and curve convexity is heightened when the yield curve is not flat, the bond is priced at a significant discount or premium, and the bond has a long time to maturity. A is incorrect because the difference between the bond's yield convexity and curve convexity is heightened when the yield curve is not flat. B is incorrect because the difference between the bond's yield convexity and curve convexity is heightened when the bond is priced at a significant discount or premium (not when it is priced at or near par). Understanding Fixed-Income Risk and Return Learning Outcome h. Calculate and interpret approximate convexity and distinguish between approximate and effective convexity