Uzi maalum wa kupeana Likes: Comment chochote upate "Like"

377. How does E.C.G. work ?

Small metal disks called electrodes are placed on your skin. The electrodes are used to pick up the electrical impulses of the heart. The impulses are recorded, giving doctors a record of your heart's electrical activity. The electrodes have wires called leads, which hook up to the electrocardiogram machine (E.C.G.).
 
376. What is Moonbow? How is it different from rainbow?

A moonbow is a rainbow produced by moonlight rather than sunlight. Other than the difference in light source, its formation is exactly the same as for a solar rainbow: It is caused by the refraction of light in many water droplets, such as a rain shower or a waterfall, and is always positioned in the opposite part of the sky from the moon relative to the observer.
 
375. Male mosquito feeds on ?

Only female mosquitoes bite. Both male and female feed mainly on fruit and plant nectar, but the female also needs the protein in blood to help her eggs develop. Once she's had her fill of blood, she'll rest for a couple of days before laying her eggs.
 
373. Why plants bent toward lights?

The higher concentration of auxin on the shady side causes the plant cells on that side to grow more so it bends toward the light. Because light is the energy source for plant growth, plant shave evolved highly sensitive mechanisms for perceiving light.
It is called phototropism. Not all plants bend towards light. Monstera and Philodendron, are instead negatively phototropic and direct their stems towards the shadow cast by tree trunks, which these vines need for support.
 
372. What is the white, powdery substance that forms on battery ?

The white powdery substance is sulfuric acid and hydrogen crystals from the escaping hydrogen battery gases and liquid (the batteries have vents that allow the gases to escape.) This acid causes corosion of the copper wires and steel bolts attached to the battery and to some degree the battery posts and post connectors which are made of lead.
 
You must log in or register to reply here.
Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…