Can you please help me with a simple and short answers please. Also no meed for
ID: 203329 • Letter: C
Question
Can you please help me with a simple and short answers please. Also no meed for explanation i just need answers.Thank you eaf vein upper epidermis Mature Tissues Dermal tissue. In a cross section of a leaf (Fig. 19.3), for example, focus only on the upper or lower epidermis (Fig. 19.3) Epidermal cells tend to be square or rectangular in shape. In a leaf, the epidermis is interrupted by openings called stomata (sing., stoma). Later you will have an opportunity to see the epidermis in mesophyl s, stems, and leaves. What is a function of epidermis in all three organs (see Table 19.1)? stoma lower epidermis Figure 19.3 Microscopic leaf structure. Like the stem and root, a leaf contains epidermal tissue, vascular tissue (leaf vein), and ground tissue (mesophyl), Ground tissue. The ground tissue fills the space between epidermis in roots, stems, and leaves. In leaves, for example, ground tissue is called mesophyll (see Fig. 19.3). Ground tissue largely contains parenchyma cells and sclerenchyma cells. Paranchyma cells can be of different sizes from fairly circular to oval. Those that contain chloroplasts carry on photosynthesis. Those that contain leucoplasts store starches and oil Sclerenchyma cells are usually elongate in shape and have thick walls impregnated with lignin. These dead cells appear hollow and the presence of lignin means that they stain a red color. Sclerenchyma cells are strong and provide support. Which type cell (parenchyma or sclerenchyma) carries on photosynthesis or stores the products of photosynthesis in a leaf? 2. Which one lends strength to ground tissue in roots and stems? 3. Vascular tissue. In a leaf, strands of vascular tissue are called leaf veins (see Fig. 19.3). There are two types of vascular tissue, called xylem and phloem. Xylem contains hollow dead cells that transport water. The presence of lignin makes the cell walls strong, stains red, and makes xylem easy to spot. Phloem contains thin-walled, smaller living cells that transport sugars in a plant. Phloem is harder to locate than xylem, but it is always found in association with xylem. Which type tissue (xylem or phloem) transports sugars in a plant? Which type tissue transports water?
Explanation / Answer
1. Epidermis is the outermost layer that protects the inner tissues by acting as a barrier or protective layer. It protects against water loss/transpiration and regulates gas exchange through stomata. In roots it helps in absorption of water and mineral nutrients and secretion of metabolic compounds.
2. Parenchyma carries out photosynthesis. Sclerenchyma gives strength.
3. Phloem transports sugar. Xylem transports water.