Biology Quiz 2

Carbohydrates can be divided into three main categories: sugar, fiber and starch. Starches are the most commonly consumed type of carbohydrate. Cereal grains and root vegetables are a rich source of starches.

Fluoride or fluorine deficiency can lead to tooth decay and possibly osteoporosis. Consuming enough fluoride can make tooth decay less likely and may strengthen bones. Fluoride is a mineral stored in teeth and bones that strengthens them by aiding in the retention of calcium.

The kidney is the organ that excretes water, fat and various catabolic wastes. The kidneys remove waste products called urea from the blood through tiny filtering units called nephrons. There are about one million nephrons in each kidney.

Vitamin C, also known as ascorbic acid, is a temperature-sensitive vitamin, so is easily destroyed by heat. It is easily degraded during cooking.

The locomotory organ of Amoeba is Pseudopodia or false feet. Pseudopodia is a temporary or semipermanent extension of the cytoplasm, used in locomotion and feeding by all sarcodine protozoans and some flagellate protozoans.

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).

Leaves are green due to the presence of a green-coloured pigment, called chlorophyll. Chlorophyll is important because it helps plants make energy from sunlight—a process called photosynthesis.

The leather belt is biodegradable. Biodegradable materials are substances that decompose naturally through the actions of bacteria, fungi, and other living organisms.

Haemolymph is observed in Arthropods. It is a fluid, analogous to the blood in vertebrates, that circulates in the interior of the arthropod (invertebrate) body, remaining in direct contact with the animal's tissues.

Whale, Bat, Kangaroo and Hippopotamus belong to the class Mammalia. Penguins and Ostrich are a group of aquatic flightless birds not belonging to the class Mammalia.