(a) Define the terms budding and grafting (b) List four materials required for budding (c) Give two reasons why the improvement of crops by selection may no...

(a) Define the terms budding and grafting (b) List four materials required for budding (c) Give two reasons why the improvement of crops by selection may not produce the desired results (d) State four disadvantages of asexual reproduction and four advantages of sexual reproduction in crop plants.