Elements of agriculture, for use Elements of agriculture, for use in schools elementsofagricu00mcbr Year: 1901 PAKTS OF A PLAA^T 43 of leaves are really a continuation of the stem. Fio-. 9 shows veins in a leaf of beetle-weed. The green color of leaves is due to the presence of a substance called chlorophyll, or leaf-green, which is found in the leaves of all living plants that draw their food from the soil. This green coloring matter, chloro- phyll, has much to do with making the differ- ent compounds which go to make up the plant. In the autumn, when, the first frost falls, the leaves of
Elements of agriculture, for use Elements of agriculture, for use in schools elementsofagricu00mcbr Year: 1901 PAKTS OF A PLAA^T 43 of leaves are really a continuation of the stem. Fio-. 9 shows veins in a leaf of beetle-weed. The green color of leaves is due to the presence of a substance called chlorophyll, or leaf-green, which is found in the leaves of all living plants that draw their food from the soil. This green coloring matter, chloro- phyll, has much to do with making the differ- ent compounds which go to make up the plant. In the autumn, when, the first frost falls, the leaves of plants lose their green color, taking many shades of red and brown. This change in color IS an indication that their life is over and that they are of no more use to the plant. AYhen the leaves die plant-growth ceases till a new crop is formed in the spring. EXPERIMENT Fill a small box with earth and in it2jlant a few seeds. After the plants hare begun to grow, cover them with a box having an opening to the light on one side only. After a time notice how the young plants grow towards the light. Remove the box and the plants change their direction and grow upwards. Fig. 9—Veins in leaf of beetle-weed (Galax aphylla. L.) (Origi- nal drawing from nature.) Questions 1. Into what three parts may a plant be divided? 2. What are these parts called? 3. How many of these
Size: 1065px × 1878px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
