DNA has to replicate before a cell divides because each daughter cell has to receive a complete set of genetic information.
Plant tissues are categorized broadly into three tissue systems: the epidermis, the ground tissue, and the vascular tissue. Epidermis - Cells forming the outer surface of the leaves and of the young plant body. Vascular tissue - The primary components of vascular tissue are the xylem and phloem.
<span> In biosphere, it is the total organismic life and their entire species on which how they interact with the co-organisms. While biodiversity, is the different and varied living organisms and creatures across the ecosystem or the biosphere, on which is the composed the biotic environment. This may include now the hierarchy and organization among the species of the autotrophs and heterotrophs. </span>
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The leaf as a photosynthetic organ includes the following cells which contains chloroplasts
--> the palisade mesophyll
--> the spongy mesophyll and
--> the stomatal guard cells
Although all the green parts of a plant can be involved in the photosynthetic activities (with the exception of the root hairs), the leafs are the main organ of photosynthesis. Photosynthesis is the process by which green plants manufacture their food in the presence of sunlight. This takes place in the chloroplasts of these plant. Chloroplasts are structures that contains chlorophyll which traps in energy from the sunlight.
The mesophyll tissues are located between the upper and the lower epidermis of the leaf. The palisade mesophyll, which is found at the upper part, contains numerous chloroplasts and is the main site of photosynthesis in the leaf.
The spongy mesophyll is located at the lower part of the epidermis. They are irregularly arranged with air spaces between them which are linked to the stomatal openings. They also contain chloroplasts.
The stomatal guard cells are a pair of bean-shaped cells which controls the opening and closing of stomata. These cells contains chloroplasts which contributes to the movement of stomata.
Therefore the three different cells of the leaf that contains chloroplasts are the palisade mesophyll, the spongy mesophyll and the stomatal guard cells.
You can read more about chloroplasts through the link below:
brainly.com/question/20092825
