Stomatal transpiration accounts for about 80-90% of total water loss from plants. Stomata are microscopic pores on leaves, surrounded by guard cells. Cuticular transpiration occurs through the cuticle but is minimal. Lenticular transpiration is through lenticels on woody stems. Hydathodes are involved in guttation, not transpiration. Transpiration creates transpiration pull essential for water ascent in xylem.
Explanation:
Cytokinins are plant hormones that promote cytokinesis (cell division) and shoot initiation. They are used in tissue culture along with auxins to induce organogenesis. Auxins promote cell elongation and root initiation, gibberellins stem elongation, abscisic acid stress responses and dormancy.
Explanation:
Oxidative phosphorylation occurs on the inner mitochondrial membrane, where the electron transport chain creates a proton gradient, and ATP synthase uses this gradient to produce ATP. This is the major source of cellular energy. Nucleus stores DNA, Golgi processes proteins, ribosomes synthesize proteins.
Explanation:
Meiosis is reductional division occurring in germ cells to produce haploid gametes (n) from a diploid cell (2n). It involves two successive divisions (Meiosis I and II) and introduces genetic variation through crossing over and independent assortment. Mitosis maintains chromosome number, amitosis is direct division, and fission is asexual reproduction in prokaryotes.
No comments yet. Be the first to start the discussion!