Tag: zoology

Agroecosystem is also called as ecosystem on agricultural land. It is created by man. It includes biotic and nonbiotic components involved in that unit and their interactions.  It is unstable because of lack of variety and lack of biological control. It also lacks self-control.

An ecotype is known as the population of a species that survives as a distinct group through environmental selection and isolation and that is comparable with certain species.

An open system is defined as a system wherein there is free exchange of both matter and energy with the surroundings. The system has interaction with the external environment. A close system is defined as a system where there is no exchange of either matter or energy with the surroundings. All the ecosystems on Earth are called as open systems. Earth is an open system for energy. 

The living world is made up of different communities living in it. Some of these communities are the communities living in oceans, fresh water and forest communities, communities living in grasslands and deserts. These communities have different individuals belonging to them and have certain different characteristics. So, option D is the correct answer.

An incomplete ecosystem is cave. Its habitat is not suitable for primary productivity. It lacks sunlight and primary plant productivity. The animals and plants are present only at the entrance of cave as limited sunlight reaches at the entrance.