absent in leaf. a.lenticell b.mesofil. c.clororplast
Answers
Explanation:
A lenticel is a porous tissue consisting of cells with large intercellular spaces in the periderm of the secondarily thickened organs and the bark of woody stems and roots of dicotyledonous flowering plants. It functions as a pore, providing a pathway for the direct exchange of gases between the internal tissues and atmosphere through the bark, which is otherwise impermeable to gases. Lenticels are absent in woody climbers.
Heart wood is also called as 'duramen'. The spring wood is lighter in colour and has a lower density. Thus, option A is correct.
Chloroplasts are organelles that conduct photosynthesis, where the photosynthetic pigment chlorophyll captures the energy from sunlight, converts it, and stores it in the energy-storage molecules ATP and NADPH while freeing oxygen from water in plant and algal cells.
The mesophyll is the name given to two layers of cells inside of the plant's leaves. The first layer, located under the epidermis but above the second layer, is the palisade parenchyma cells. This layer is inundated with loads of chloroplasts, making it the layer most directly responsible for photosynthesis.
The lenticels found on the epidermis of different plant organs (stem, petiole, fruits) made up of parenchymatous cells are pores that always remain open, in contrast to stomata, which regulate their extent of opening. Lenticels are visible on fruit surfaces, such as mango, apple, and avocado.
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