1. The basic unit of life is:
(a) Cell
(b) Tissue
(c) Organ
(d) Organ system
2. The process by which plants convert sunlight into energy is called:
(a) Respiration
(b) Photosynthesis
(c) Digestion
(d) Excretion
3. The control center of a cell is the:
(a) Cell membrane
(b) Cytoplasm
(c) Nucleus
(d) Mitochondria













