CELL SPECIALIZATION IN PLANTS CELL SPECIALIZATION IN PLANTS 1. What are stomata? 1. What are stomata? Draw and label a stoma. Draw and label a stoma. 2. What factors regulate the opening and closing of guard 2. What factors regulate the opening and closing of guard cells? cells? 3. Use a T-Chart to compare vascular and nonvascular 3. Use a T-Chart to compare vascular and nonvascular plants. Be sure to include examples of each. plants. Be sure to include examples of each. 2. Describe the two main kinds of vascular tissue. 2. Describe the two main kinds of vascular tissue. 3. Draw and label your piece of celery. 3. Draw and label your piece of celery.