Psle 2012 Science Questions And Answers -

(a) Name one structure seen in the onion cell but not in the cheek cell. (b) What is the function of the nucleus?

(a) Algal bloom. (b) Algae block sunlight → plants die → less oxygen → fish die. psle 2012 science questions and answers

C) Cell wall Explanation: Plant cells have a rigid cell wall outside the cell membrane for support; animal cells do not. (a) Name one structure seen in the onion

(a) What has happened to the steel rod? (b) What is this process called? psle 2012 science questions and answers