Jaidev takes 2 and 1/5 minutes to walk across the school ground. Rahul takes 7/4 minutes to do the same. Who takes less time and by what fraction?
Answers
Answer:
Am I
Step-by-step explanation:
2 1/5 = 10 + 1 / 5 = 11 / 5
Now, comparing both, we have :
11 / 5 > 7 / 4
Also,
11
5
−
7
4
=
11
×
4
−
7
×
5
20
=
9
20
Hence Rahul takes less time as compared to Jaidev by
9 / 20 minute
fraction.
The subject ecology is basically concerned with four levels of biological organisation.
These are given below:
(i)Organism Living component of the environment at individual level and is basic unit of ecological hierarchy.
(ii)Population The sum total of all individuals of a species in a specific geographical area.
(iii)Communities Assemblage of all the populations of different species present in an area that interact among themselves.
(iv)Biome It is a large unit, which consists of a major vegetation type, associated fauna in a particular climatic zone. Tropical rainforest, deciduous forest, sea coast, deserts, etc., are the major biomes of India.
NOTE Other important terms used in ecology are:
Ecosystem Represents, the organisms and their environment in a particular area.
Habitat It refers to a specific place or locality delimited by a combination of factors, physical features and barriers where a community dwells.
Niche The ecological niche of an organism represents the physical space occupied by it, the resources it utilises and its functional role in the ecological system.
Biosphere The surface of earth with all life forms, i.e. union of all ecosystems. It is a highly ordered system.