Fertilization occurred; all that is needed is the proper environment to encourage the embryo to grow. When this occurs, the plant quickly sprouts, first producing stem and leaves for support and the gathering of water and nutrients, as well as the production of energy via photosynthesis.
Roots also grow, absorbing nutrients and moisture from the soil. Transfer of nutrients from the roots to the higher portions of the plant, as well as some transfer of energy from the photosynthesis occurring above the ground to the roots, is facilitated by certain cells within the stem of the plant. The production of flower petals and the plant's reproductive organs occurs last in the plant's life cycle; for some plants this step occurs only once, for others it happens more often. For flowering plants of both types, however, the basic parts and the means of reproduction that they facilitate are virtually identical, though they are also quite complex.
Pollen grows on the anther, which itself grows at the end of a filament. This is the male reproductive organ of the plant, known collectively as the stamen. In order for a plant to reproduce (either with itself or with another plant), pollen (which contains two sperm cells per pollen grain) must be transferred to the carpel. When this occurs, tubules grow down into the ovary, allowing the sperm cells from the pollen to travel down and fertilize the ovum of the plant, which will mature into embryos and then seeds, which will themselves be released to start the process over.
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Easter Island, according to the available evidence, was a pristine wilderness before human beings first arrived on the small and remote...
8) Diffusion refers to the tendency of molecules to spread out evenly amongst each other due to their kinetic energy. Osmosis is the balancing out of the concentration of two solutions -- usually in water -- through a membrane. 9) They could also be acting as clotting agents in the event of a cut/tear, or possibly isolate an area of weakness or infection through clustering around it. 10) A red blood cell needs to be
Homeostasis Defined Homeostasis, according to Nirmalan and Nirmalan (2017), is the propensity for living organisms to maintain relative stability in the internal environment. Homeostasis is made possible through the cooperation of several regulatory mechanisms and separate sub-systems which make up the normal physiology of a living organism (Nirmalan & Nirmalan, 2017). During critical illnesses internal or external stress can make an attempt at interfering with the self-regulation systems beyond what is
Function of Homeostasis in Human Biology The preservation of stability or constant condition in a biological system by means of automatic mechanisms that work against influences leaning towards disequilibria is Homeostasis. (Homeostasis {hohm-ee-oh-stay'-sis}) Homeostasis is the capacity of the body to preserve relative constancy and work even when severe changes occur in the external environment or in one part of the body. (Homeostasis: Toxiocology Tutor III) This is one of the
In the tissue culture, they usually proliferate indefinitely. The normal constraints which limit the growth of the cells absent in the cancerous state and are also characterized by the division ability for number of generations which is unlimited. Cell cycle and cancer With millions of chemical reactions taking place concurrently and in specific areas, the human body can be thought of as a small laboratory. It is the only "machine" with
Enzymes are highly selective and substrate-specific catalysts that work by lowering activation energy for reactions thus increasing the rate of metabolic reactions. In enzymatic reactions, substrates are molecules binding onto enzymes' active sites to form enzyme-substrate complexes (Cornish-Bowden, 2004). Lactose is a disaccharide sugar commonly found in milk and lactase is the enzyme responsible for catalyzing lactose into its subsequent monosaccharide products; glucose and galactose. In line with this, lactose
The 2016 article concerns cigarette smoking, its potential numerous connections with disease and its impact in the current international healthcare system. The researchers state smoking impacts adaptive and innate immunity, playing a dual role in regulation of immunity via attenuation of defensive immunity or pathogenic immune responses. The types of adaptive immune cells that feel the impact from cigarette smoking are "T helper cells (Th1/Th2/Th17), CD4+CD25+ regulatory T. cells, CD8+
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