Biology Quiz 7

Birds have only one functional ovary, typically on the left side of the body.

Among the given options, Mollusc plasma bears the smallest living cell. Mycoplasma is the smallest living known cell. It is prokaryotic, devoid of a cell wall and can live without oxygen. It is pathogenic to both plants and animals.

Zinc is the metal which presents in insulin. Insulin is a hormone that regulates the level of sugar (glucose) in the blood and that is produced by the beta cells of the islets of Langerhans in the pancreas. In humans, insulin is stored as a crystalline hexamer containing two zinc ions and one calcium ion. The chemical formula of insulin is C₂₅₇H₃₈₃N₆₅O₇₇S₆.

A typical heart has four chambers (two upper and two lower). The upper chambers, the right and left atria, receive incoming blood. The lower chambers, the more muscular right and left ventricles, pump blood out of the heart. The heart valves are gates at the chamber openings.

Goats tend to be less susceptible to heat stress than animals like cows, donkeys, and buffalos. They can tolerate more summer heat. A healthy adult goat can survive in temperatures ranging from below -18°Celcius and above 38°Celcius.

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

Blood pressure is controlled by Adrenal gland. Adrenal glands produce hormones that help regulate metabolism, immune system, blood pressure, response to stress and other essential functions. Adrenal glands are composed of two parts — the cortex and the medulla — which are each responsible for producing different hormones.

To measure blood pressure, doctor uses an instrument called a sphygmomanometer, which is more often referred to as a blood pressure cuff.

Biological control is the use of living organisms to maintain pest populations below damaging levels. Predators of a pest, Pheromone traps and neem extracts are used as a Biological control. Pesticides are not used as a Biological control as it is a chemical agents.

The undesirable plants that grow along with the desirable plants are called weeds. Water hyacinth is useful to check water pollution caused by industrial effluents. It is observed that water hyacinth has the capability to reduce the pH of textile waste water from alkaline to neutral, COD and BOD reduction in the range of 40–70%, total solids with a maximum reduction of 50.64%. The reduction in pH further favoured microbial action to degrade COD and BOD in wastewater.