Ozone formation takes place differently in the stratosphere region and the troposphere region of the earth’s atmosphere. The heat or sunlight causes chemical changes or dissociates molecules of oxygen into individual atoms, which can further react with the atmospheric oxygen to form stratospheric ozone. In contrast, the heat or sunlight causes chemical reactions in the …
A floral formula is one of the ways to summarise all the flower characteristics, which makes the use of discrete letters, numbers and symbols. The letters used in the floral formula indicate the members of the perianth and other floral parts. Specific signs or symbols are also used to denote the properties like parentheses, aestivation, …
The difference between nucleus and nucleolus is mainly due to the following factors: Location: Nucleus is the core central organelle of the eukaryotic cell, while nucleolus resides interior to the nucleus. Size: The size of the nucleolus is very small compared with the size of the nucleus. Under the microscope, the nucleus appears as a …
The solenoid model illustrates the packaging or folding of DNA within the eukaryotic cell nucleus. It was first introduced by the scientist’s John Finch and Aaron Klug in the year 1976. In eukaryotes, the DNA is organized compactly due to the association of bead-like histone octamer and linker histones. Oppositely, the DNA content in prokaryotes …
A plant cell nucleus is a specialized structure, which stores genetic information and monitors cellular activities. Plants are monokaryotic cells, which possess an individual nucleus. A well-developed nucleus is only found in the advanced or multicellular organisms, those having division of labour. Nucleus presence is a prominent feature in plant cells, as it plays a …
Sense of smell is one of the senses processed by our nervous system to let us know more about our surroundings and the things we consume to keep the body healthy and safe. The sense of smell is a set of information coming through the nose. The sensory organ comprises specialized cells and tissues that …
The difference between the food chain and the food web is mainly due to the network of links and the number of trophic levels the organisms form in the different ecosystems. A food chain is a one-way pathway that includes a linear network of linking organisms. In contrast, a food web shows a complex network …
The dark reaction of photosynthesis refers to the phase that doesn’t need light energy or photons to complete the cycle and hence also called the light-independent photosynthetic phase. Dark reaction or Calvin cycle was first explained by a scientist named Melvin Calvin. It occurs at the site of the chloroplast within the fluid surrounding the …
The difference between photosystem I and photosystem II is primarily due to the difference in active reaction centre and photon absorption. P700 is the active reaction centre of PS-I, while P680 is the active reaction centre of PS-II. PS-I absorbs light of a longer wavelength (between 725-1035 nm), while PS-II absorbs light of a shorter …
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Nitrification is one of the crucial steps in the nitrogen cycle that occurs in soil. It is an aerobic process that involves two successive oxidation reactions, in which the ammonia first oxidizes into nitrites, and then nitrites get oxidized into nitrates. It occurs in the soil and includes members of autotrophic bacteria and archaea. The …