A RAY OF LIGHT STRIKES A PLANE MIRROR AT AN ANGLE OF INCIDENCE OF 35°. IF THE MIRROR IS ROTATED THROUGH 10°, THROUGH WHAT ANGLE IS THE REFLECTED RAY ROTATED
A. 70° B. 45° C. 25° D. 20° ✓ The answer to the question is: D. 20° When a ray of light strikes a plane mirror, the angle of incidence is equal to the angle of reflection. According to the law of…
THE SENSORY CELL THAT RESPONDS TO DIM LIGHT IS REFERRED TO AS THE
A. cone B. lens C. rod ✓ D. iris The answer to the question is: C. rod The sensory cell that responds to dim light is referred to as the rod. Rod cells, also known as rods, are photoreceptor cells in the retina of…
WHEN BLUE AND GREEN COLOURS OF LIGHT ARE MIXED, THE RESULTANT COLOUR IS
A. cyan ✓ B. magenta C. black D. yellow The answer to the question is: A. cyan When blue and green colors of light are mixed, the resultant color is cyan. This phenomenon is a result of additive color mixing, which occurs when different…
SHEDDING LIGHT ON LAMPBRUSH CHROMOSOME
The lampbrush chromosome is a highly extended form of a chromosome found in the oocytes (immature egg cells) of most animals, including birds, reptiles, and some lower vertebrates. These chromosomes were first discovered in the 19th century by German embryologist…
TYPES OF MUSCLES AT THE LIGHT AND ELECTRON MICROSCOPIC LEVELS
1) Skeletal Muscle: At the light microscopic level, skeletal muscle appears striated due to the arrangement of actin and myosin filaments. Under a light microscope, skeletal muscle fibers show alternating dark A bands and light I bands. The A bands…
SHEDDING LIGHT ON PHOTO-TRANSDUCTION
Introduction Photo–transduction is a process by which light is converted into chemical energy within a cell. This process involves the absorption of light by a photoreceptor protein, which triggers a cascade of intracellular signaling events that ultimately lead to the…
SHEDDING LIGHT ON SEDATIVE-HYPNOTICS
Major chemical classes of sedative-hypnotics Sedative-hypnotics are a class of drugs that are used to induce relaxation, reduce anxiety, and promote sleep. These drugs can be classified into several major chemical classes based on their molecular structures and mechanisms of…
NASTIC AND TACTIC MOVEMENT
Nastic/sleeping movements The pinnate and bipinnate leaves of many leguminous plants open and close as a result of certain changes in temperature, light intensity or humidity of the atmosphere. The process which is however gradual is known as “sleeping movement”…