QUES: Plants synthesize a number of unique polymers like the polysaccharide molecules cellulose, pectin and xyloglucan from which the land plant cell wall is constructed. Vascular land plants make lignin, a polymer used to strengthen the secondary cell walls of xylem tracheids and vessels to keep them from collapsing when a plant sucks water through them under water stress. Lignin is also used in other cell types like sclerenchyma fibers that provide structural support for a plant and is a major constituent of wood. Sporopollenin is a chemically resistant polymer found in the outer cell walls of spores and pollen of land plants responsible for the survival of early land plant spores and the pollen of seed plants in the fossil record. It is widely regarded as a marker for the start of land plant evolution during the Ordovician period. The concentration of carbon dioxide in the atmosphere today is much lower than it was when plants emerged onto land during the Ordovician and Silurian periods. Many monocots like maize and the pineapple and some dicots like the Asteraceae have since independently evolved pathways like Crassulacean acid metabolism and the C4 carbon fixation pathway for photosynthesis which avoid the losses resulting from photorespiration in the more common C3 carbon fixation pathway. These biochemical strategies are unique to land plants.
What gas is in lower concentration now due to plants?

ANS: carbon dioxide

QUES: Having removed the monarchical government, Gaddafi proclaimed the foundation of the Libyan Arab Republic. Addressing the populace by radio, he proclaimed an end to the "reactionary and corrupt" regime, "the stench of which has sickened and horrified us all." Due to the coup's bloodless nature, it was initially labelled the "White Revolution", although was later renamed the "One September Revolution" after the date on which it occurred. Gaddafi insisted that the Free Officers' coup represented a revolution, marking the start of widespread change in the socio-economic and political nature of Libya. He proclaimed that the revolution meant "freedom, socialism, and unity", and over the coming years implemented measures to achieve this.
What did Gaddafi insist that the coup be referred to as?

ANS: a revolution

QUES: At a certain temperature, (usually between 1,500 °F (820 °C) and 1,600 °F (870 °C), depending on carbon content), the base metal of steel undergoes a change in the arrangement of the atoms in its crystal matrix, called allotropy. This allows the small carbon atoms to enter the interstices of the iron crystal, diffusing into the iron matrix. When this happens, the carbon atoms are said to be in solution, or mixed with the iron, forming a single, homogeneous, crystalline phase called austenite. If the steel is cooled slowly, the iron will gradually change into its low temperature allotrope. When this happens the carbon atoms will no longer be soluble with the iron, and will be forced to precipitate out of solution, nucleating into the spaces between the crystals. The steel then becomes heterogeneous, being formed of two phases; the carbon (carbide) phase cementite, and ferrite. This type of heat treatment produces steel that is rather soft and bendable. However, if the steel is cooled quickly the carbon atoms will not have time to precipitate. When rapidly cooled, a diffusionless (martensite) transformation occurs, in which the carbon atoms become trapped in solution. This causes the iron crystals to deform intrinsically when the crystal structure tries to change to its low temperature state, making it very hard and brittle.
What changes when steel reaches 870°F?

ANS: unanswerable

QUES: Greece participated in the Eurovision Song Contest 35 times after its debut at the 1974 Contest. In 2005, Greece won with the song "My Number One", performed by Greek-Swedish singer Elena Paparizou. The song received 230 points with 10 sets of 12 points from Belgium, Bulgaria, Hungary, the United Kingdom, Turkey, Albania, Cyprus, Serbia & Montenegro, Sweden and Germany and also became a smash hit in different countries and especially in Greece. The 51st Eurovision Song Contest was held in Athens at the Olympic Indoor Hall of the Athens Olympic Sports Complex in Maroussi, with hosted by Maria Menounos and Sakis Rouvas.
How many time has Greece participated in the Eurovision Song Contest?

ANS:
35