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- What is a chemical substance that is released from a cell and has a local effect on the same cell type? a) Intracellular mediator b) Paracrine chemical signal c) Autocrine chemical signal d) Pheromone e) HormoneCan you answer all the parts to this question please (a) What are the advantages of the self-incompatibility (SI) system in plants? Give at least three advantages. (b) What are the differences between gametophytic SI and sporophytic SI?What does stamen produces?
- What is known as taproot ?What is the constituent of St. John’s wort that is now be- lieved to be responsible for the antidepressant effect of the herb?12) Why do you say that fertilization in seed plants is independent of water? A) Spermatid cells are not necessary for fertilization to occur in seed plants.B) Seed plants use pollen instead of spermatid cells for fertilization.C) Spermatid cells are carried by pollen grains.D) Which spermatid cells in seed plants are capable of resisting desiccation indefinitely.