Question

1. В чем различие функции столбчатой и губчатой ткани2.Почему клетки столбчатой ткани имеют большое количество хлоропластов,чем клетки губчатой ткани?срочнооооооо!!!!!!!!!!​

Answer 1

1.Эти клетки округлые и расположены рыхло. Между ними много межклетников, заполненных воздухом. В клетках губчатой ткани меньше хлоропластов по сравнению со столбчатой тканью.

Строение жилок листа. На поперечном срезе листовой пластинки под микроскопом хорошо видны жилки (проводящие пучки). Они образованы сосудами, ситовидными трубками и волокнами. Рис. (3). Строение проводящего пучка. Волокна имеют толстые стенки. Они выполняют опорную функцию.

2.Особенно много хлоропластов в ПАЛИСАДНЫХ клетках листа. Потому, что это столбчатая ткань, а она является основной фотосинтезирующей. И её клетки высоко специализированны по выполняемой функции. А также много хлоропластов в клетках губчатой фотосинтезирующей ткани.

Answer 2

Difference between Parenchyma and Sclerenchyma Tissues

1. Parenchyma Tissue: - Parenchyma tissue is a type of simple permanent tissue found in plants. - It is composed of living cells with thin cell walls and large intercellular spaces. - Parenchyma tissue is involved in various functions such as photosynthesis, storage, and secretion. - It is commonly found in the cortex of stems and roots, leaf mesophyll, and pulp of fruits. - Parenchyma cells are loosely packed, allowing for easy diffusion of gases and water. - They have a large central vacuole and may contain chloroplasts for photosynthesis. - Parenchyma tissue is responsible for the growth and repair of plant organs. - .

2. Sclerenchyma Tissue: - Sclerenchyma tissue is a type of complex permanent tissue found in plants. - It is composed of thick-walled, dead cells with lignin deposits, making them rigid and providing mechanical support. - Sclerenchyma tissue is commonly found in the stems, roots, and leaves of plants. - It provides strength and support to the plant, especially in areas where flexibility is not required. - Sclerenchyma cells are tightly packed and lack intercellular spaces. - They do not have a large central vacuole and are devoid of chloroplasts. - Sclerenchyma tissue is responsible for providing structural support to the plant. - .

Difference in Chloroplasts between Parenchyma and Sclerenchyma Cells

1. Chloroplasts in Parenchyma Cells: - Parenchyma cells can contain chloroplasts, especially in tissues involved in photosynthesis, such as the mesophyll cells in leaves. - Chloroplasts are responsible for carrying out photosynthesis, the process by which plants convert sunlight into energy. - Parenchyma cells with chloroplasts are capable of producing food for the plant through photosynthesis. - The presence of chloroplasts in parenchyma cells allows them to synthesize glucose and other organic compounds. - The abundance of chloroplasts in parenchyma cells is related to their role in photosynthesis and energy production. - .

2. Absence of Chloroplasts in Sclerenchyma Cells: - Sclerenchyma cells, on the other hand, do not contain chloroplasts. - Sclerenchyma tissue is primarily involved in providing mechanical support and protection to the plant. - The thick cell walls and lignin deposits in sclerenchyma cells make them rigid and inflexible. - Since sclerenchyma cells do not participate in photosynthesis, they do not require chloroplasts. - Instead, their cell walls provide strength and support to the plant. - .

In summary, the main difference between parenchyma and sclerenchyma tissues lies in their structure and function. Parenchyma tissue consists of living cells with thin cell walls and large intercellular spaces, while sclerenchyma tissue consists of thick-walled, dead cells with lignin deposits. Parenchyma cells may contain chloroplasts and are involved in photosynthesis, while sclerenchyma cells lack chloroplasts and provide mechanical support to the plant.