Top 10 biology factsBiology quiz
How do baby birds get oxygen inside their eggs?
Oxygen comes in through pores in the shell. Directly under the shell, there is a small pocket of air. The microscopic pores on the egg surface allow the CO2 to escape and fresh air to get in, so a developing bird can breathe.
How deep is the root system of a giant sequoia?
4 meters (13 feet). The sequoias root system is wide spreading, but shallow. There is no taproot. A mature sequoia's roots can occupy over 1 acre of earth and contain over 90,000 cubic feet of soil.
What was included in the original Pepsi-Cola recipe?
Digestive enzyme. Pepsi Cola, first introduced in 1898, was named after pepsin (enzyme) and kola (nuts). In 1931, the company entered bankruptcy and changed hands. The new owners changed the recipe to resemble more Coca-Cola.
Which plant is hazardous to harvest when it is wet?
Tobacco. Green Tobacco Sickness is a type of nicotine poisoning caused by the dermal absorption of nicotine from the surface of wet tobacco plants. The symptoms include vomiting, headache and fluctuations in blood pressure and heart rate. These may be so severe as to require emergency medical treatment.
What is the natural role of nicotine in tobacco plant?
It is poisonous to insects. Nicotine is a powerful neurotoxin to insects. Many plants other than tobacco contain it, however the concentration of nicotine in tobacco is exceptionally high. Even though some species have evolved the ability to feed on tobacco, it remains relatively easy to grow, being unpalatable to most species. In some places, tobacco became an invasive weed.
Where, in some humans, are Darwin's bumps?
On the ears. Darwin's tubercle is a congenital ear condition which often presents as a thickening on the helix at the junction of the upper and middle thirds. This is known as "Darwin's tubercle," or "Darwin's bump," because Charles Darwin mentioned it in his book The Descent of Man (Darwin 1879).
What is a bird beak made of?
Keratin. There are two main types of keratin proteins. The e α-keratins are the main structural components of hair, nails, horns and claws of mammals. The harder β-keratins are found the scales and claws of reptiles, tortoise shells, and in the feathers, beaks, claws of birds.