Tag: biology : an introduction

Microbial conversion of organic matter to methane called Biogas has become attractive as a method of waste treatment and resource recovery. This process is anaerobic(absence of oxygen) and is carried out by action of various groups of anaerobic bacteria.
Three basic points about this process are that most of the important bacteria involved in biogas production process are anaerobes and slow growing, a greater degree of metabolic specialization is observed in these anaerobic microorganisms and that most of the free energy present in the substrate is found in the terminal product methane. Since less energy is available for the growth of organism, less microbial biomass is produced and, consequently, disposal of sludge after the digestion may not be a major problem.
Hence, the statement is false.

The living organisms are composed of cells which forms the structural and functional unit of the life forms. Some of the animals are composed of only one cell which forms the complete body are known as unicellular. Some of the animals are composed of many cells which form tissues and organs are known as multicellular. 

Flower, horse and seed are made up of cells and are capable of growth and development. Table lack the property of growth and development. Therefore, table is a nonliving thing.

Under adequate and favourable conditions, the lifespan of a

• Fruit fly is 40-50 days.
• Crocodile is nearly 70-100 years, depending on the species.
• Parrot is from 50-95 years, depending on the species.
• Banyan tree is 200 years.
• Crow is 7-22 years, depending on the species.
• Butterfly is from weeks to months, depending on the species.
• Tortoise is 150 years.

The first living organisms developed in reducingatmosphere were chemo heterotrophs as they required readymade organic materials as food and anaerobes asthey were capable of  espiration in the absence of oxygen.

Sequoia has an average age of 2000 years because of favourable climatic conditions such as tannin in the bark, which makes it resistant to insects like termites. The thickness of the bark also helps protect the inner core of the tree from fire.