- An onion bulb is a type of plant storage organ. - The bulbs are composed of shortened, compressed, underground stems surrounded by fleshy modified scale (leaves) that envelop a central bud at the tip of the stem.
Which of the following materials is not a living semi-permeable membrane?
A. pig's bladder
B. Unripe pawpaw fruit
C. Yam tuber
D. Sheet of cellophane
In an experiment, mould and yeast cells were transferred into an environment with low oxygen concentration. After a few days, the mould dies while the yeast cells did not. Which of the following statements best explains the following observation.
A. The yeast cells carried out photosynthesis while the mould did not
B. Photosynthesis does not take place in the absence of oxygen
C. Respiration can take place in yeast cells in the absence of oxygen