Biology Quiz 6

William Harvey made the momentous medical discovery that the flow of blood must be continuous and that its flow must be in one direction only.

Due to Vitamin D deficiency, the limb bones of children become bent. Vitamin D deficiency can cause children to get rickets. Rickets is a disease that causes thin, weak and deformed bones. In adults, not having enough vitamin D and calcium causes osteoporosis (loss of bone density) and can lead to fractures.

The world's smallest flowering plant is the watermeal, or Wolffia globosa.

Urease was the First Crystalline Enzyme and the Proof That Enzymes Are Proteins. The isolation and crystallization of urease by James Sumner, in 1926, provided a breakthrough in early enzyme studies.

Yawning occurs when CO₂ concentration in the blood is high, and Oxygen (O₂) concentration is low. The yawn acts as a boost to the O₂ levels.

What 1 to 2 percent of the solar energy is trapped and utilised by the plants. Most solar energy occurs at wavelengths unsuitable for photosynthesis. Between 98 and 99 percent of solar energy reaching Earth is reflected from leaves and other surfaces and absorbed by other molecules, which convert it to heat.

The approximate time required for a heartbeat is 0.8 second. A normal resting heart rate for adults ranges from 60 to 100 (for children- 70 to 100) beats per minute. (Approximate time required for a heartbeat = 60 second ÷ average heart rate ≈ 0.8 second).

Iodoform (triiodomethane) is a yellow, crystalline solid belonging to the family of organic halogen compounds. It is used as an antiseptic component of medications for minor skin diseases.

Ischemia is insufficient blood supply in the human body. It is a restriction in blood supply to tissues, causing a shortage of oxygen that is needed for cellular metabolism (to keep tissue alive).

Normal fasting blood glucose levels range from 70 to 99 mg/dL (3.9 to 5.5 mmol/L). Higher ranges could indicate pre-diabetes or diabetes.