Primary lahars often result from interaction of water with pyroclastic flow deposits. As a result the lahars may be very hot (Figure 56.2(B)); temperatures close to boiling have been recorded. This can increase the hazard as the high temperatures lead to scalding of people and animals caught in the lahar.Read More →
Mitotic recombination is a type of genetic recombination that may occur in somatic cells during their preparation for mitosis in both sexual and asexual organisms. … Mitotic homologous recombination occurs mainly between sister chromatids subsequent to replication (but prior to cell division). Does recombination occur in meiosis I or II?Read More →
Zener breakdown voltage is found to occur at electric field intensity of about 3×107 V/m. Zener breakdown occurs in heavily doped junctions (p-type semiconductor moderately doped and n-type heavily doped), which produces a narrow depletion region. Which occurs first Zener breakdown or avalanche? The avalanche breakdown occurs in the thickRead More →
As you get older, your eyes lose the ability to focus, and the natural lenses harden and lose their flexibility. “Adults over the age of 40 may start becoming farsighted with age, and you’ll see the lens change color from yellow to orange and even dark brown,” Liu says. WhenRead More →
Transpiration occurs through the stomatal apertures, and can be thought of as a necessary “cost” associated with the opening of the stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. How does the process of transpiration take place explain with an example? Transpiration is theRead More →
The process of swallowing, also known as deglutition, involves the movement of substances from the mouth (oral cavity) to the stomach via the pharynx and esophagus. Swallowing is an essential and complex behavior learned very early in development. Who controls deglutition? The swallowing center in the medulla oblongata initiates theRead More →
Sensation is about detecting things that exist in the world through: sight, sound, smell, touch and taste. To do this the body uses the sensory organs: eyes, ears, nose, skin and tongue which send messages to a specialised area in the brain called the ‘sensory cortex‘. Where does sensation occurRead More →
Photosynthesis, a plant’s internal process that converts light energy into food, takes place mostly in the leaves of plants. Plants and trees utilize specialized structures to conduct the chemical reactions necessary to transform sunlight into chemicals the plant can use. Does photosynthesis occur only in leaves? Answer: Photosynthesis is aRead More →
Areas where plates are colliding form convergent boundaries, and areas where plates are expanding create divergent boundaries. Rift valleys are formed by divergent boundaries that involve continental plates. Are rifts underwater? Many of Earth’s deepest rift valleys are found underwater, dividing long mountain ranges called mid-ocean ridges. … Like manyRead More →
One of the critical processes monitored by the cell cycle checkpoint surveillance mechanism is the proper replication of DNA during the S phase. Even when all of the cell cycle controls are fully functional, a small percentage of replication errors (mutations) will be passed on to the daughter cells. WhatRead More →