The passage describes the process of micropropagation in plants. Complete the passage by writing a suitable word or words in each of the numbered spaces.

Micropropagation is an in vitro technique used to clone plants. Small pieces of plant tissue, known as (1) \text{__________}, are cut from the mother plant. To prevent contamination by undesirable (2) \text{__________}, all tools and containers must be thoroughly sterilised. These tissues are then placed onto a nutrient (3) \text{__________} medium. This medium contains a carbon source, usually (4) \text{__________}, which provides the cells with energy for respiration. The medium also contains growth regulators and mineral ions: (5) \text{__________} ions are essential for synthesising amino acids, whereas (6) \text{__________} ions are required to produce chlorophyll. The cells divide to form an undifferentiated tissue mass called a (7) \text{__________}, which eventually develops roots and shoots. Because this process involves asexual reproduction, the regenerated plants are genetically (8) \text{__________} to the parent plant.