Biology Quiz 4

The best wavelengths of visible light for photosynthesis fall within the blue range (425–450 nm) and red range (600–700 nm). Therefore, the best light sources for photosynthesis should ideally emit light in the blue and red ranges. Green light is the least effective in photosynthesis.

Cytology is the study of cells as fundamental units of living things. A cytology test is used to look closely at cells and body fluids.

The nitrogen present in the atmosphere is utilised through microorganisms. Plants get the nitrogen from the soil, where it has already been fixed by microorganisms (bacteria and archaea). Bacteria and archaea in the soil and in the roots of some plants have the ability to convert nitrogen from the air (N₂) to ammonia (NH₃), thereby breaking the tough triple bond of molecular nitrogen.

Testosterone is the primary sex hormone in males. It plays a key role in the development of male reproductive tissues such as testes and prostate, as well as promoting secondary sexual characteristics such as increased muscle and bone mass, and the growth of body hair.

The Red Data Book is a public document that is created for recording endangered and rare species of plants, animals, fungi as well as some local subspecies that are present in a particular region.

The tusks of an elephant are upper incisors that are modified to become long and curved. They replace deciduous milk teeth at 6–12 months of age and grow continuously at about 17 cm (7 in) a year.

Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years.

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.

Hypothalamus is the gland that holds the body's thermostat. It is involved in different daily activities like eating or drinking, in the control of the body's temperature and energy maintenance, and in the process of memorizing and in stress control. It acts as the body's smart control coordinating centre.

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.