explain why a leaf is described as organ not tissue
Answers
Explanation:
leaf is composed of more than one type of cell, therefore is an organ (tissues only contain one type of cell.) ... A leaf also performs various functions (e.g. transpiration, photosynthesis, protein synthesis) while a tissue performs only a specific function.
Answer:
A leaf is an organ because it is made up of more than one kind of cell, unlike tissues, which only have one kind of cell. A leaf also does different things, like synthesis of proteins, transpiration, and photosynthesis), whereas a tissue only serves a single purpose.
Vascular plants typically have leaves because they have lignified tissues (xylem) that allow them to carry water. Most of the time, leaves are thin and flat to let in as much light and gas as possible. The arrangement of the leaf has evolved to maximize chloroplast exposure to light and carbon dioxide absorption. Stomata, pores in the epidermis of the leaf, enable the plant to regulate the exchange of carbon dioxide, oxygen, and water vapor with the surrounding environment.
The leaves of different plants have very different shapes and structures. This is contingent on the climate, the intensity of the available light, the presence of grazing animals, nutrients, and other plant competition. The leaves can be isobilateral or dorsiventral. Both surfaces of dorsiventral leaves are distinct in appearance and structure. The surfaces of isobilateral leaves appear identical on both sides. Leaves are modified to store food and water in addition to other things.
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