Q. Where is chloroplast found in the leaf?
leaf mesophyll
Q. Where are most of the chloroplast found in the internal part of a leaf?
1: Structure of a leaf (cross-section): Photosynthesis takes place in the mesophyll. The palisade layer contains most of the chloroplast and principal region in which photosynthesis is carried out.
Q. Which cells in a leaf contain the most chloroplasts?
Palisade cells contain the largest number of chloroplasts per cell, which makes them the primary site of photosynthesis in the leaves of those plants that contain them, converting the energy in light to the chemical energy of carbohydrates.
Q. What is the function of the epidermis in a leaf?
Epidermis, in botany, outermost, protoderm-derived layer of cells covering the stem, root, leaf, flower, fruit, and seed parts of a plant. The epidermis and its waxy cuticle provide a protective barrier against mechanical injury, water loss, and infection.
Q. What is the lower epidermis of a leaf?
Lower epidermis refers to a single layer of cells on the lower surface of the leaf that contains stomata and guard cells. It contains more stomata (thousands per square centimeter) than upper epidermis. A stoma is an opening on the epidermis, which allows the exchange of carbon dioxide and oxygen and transpiration.
Q. Why does the bottom of a leaf have more stomata?
This is an adaptation to prevent excess water loss. Transpiration is the loss of water through stomata, so, more stomata are found on the lower surface to prevent excessive loss of water. …
Q. Which side of the leaf has more stomata and why?
All surfaces of the leaf have some amount of stomata for regulating gas exchange for photosynthesis. However, the lower epidermis (the underside of the leaf) has more, because it is more often in the shade and so it is cooler, which means evaporation won’t take place as much.
Q. Under what conditions would stomata be open?
When humidity conditions are optimal, stomata are open. Should humidity levels in the air around plant leaves decrease due to increased temperatures or windy conditions, more water vapor would diffuse from the plant into the air. Under such conditions, plants must close their stomata to prevent excess water loss.
Q. Under what conditions would a plant close the stomata?
At night, the stomata close to avoid losing water when photosynthesis is not occurring. During the day, stomata close if the leaves experience a lack of water, such as during a drought. The opening or closing of stomata occur in response to signals from the external environment.
Q. What is the function of stomata in leaf of a plant?
Stomata are composed of a pair of specialized epidermal cells referred to as guard cells (Figure 3). Stomata regulate gas exchange between the plant and environment and control of water loss by changing the size of the stomatal pore.
Q. Why do plants close their stomata at night?
Stomata are mouth-like cellular complexes at the epidermis that regulate gas transfer between plants and atmosphere. In leaves, they typically open during the day to favor CO2 diffusion when light is available for photosynthesis, and close at night to limit transpiration and save water.
Q. Why can’t stomata be open all the time?
Guard cells straighten out when water pressure decreases and they close the stomata, keeping water in. Why can’t stomata be kept open all of the time? it is from the transpiration of the water from the plants, which cools and condenses on the walls.
Q. Do trees respire at night?
During daylight hours, plants take in carbon dioxide and release oxygen through photosynthesis, and at night only about half that carbon is then released through respiration. At night, they use oxygen and release carbon dioxide. Trees.
