Question

The data given in table shows species richness of mosses, shrubs and trees calculated for one hectare$\left( {10,000{m^2}} \right)$of land every$50$years for$200$years based on a long running ecological study according to the data natural disaster occurred during which time period?

Year	Mosses	Shrubs	Trees
1800	16	2	0
1850	21	7	4
1900	10	5	3
1950	13	12	6
2000	17	28	14

A) $1750 - 1800.$
B) $1800 - 1850.$
C) $1850 - 1900.$
D) $1900 - 1950.$
E) $1950 - 2000.$

Answer 1

Hint: The interaction between abiotic and biotic factors in the environment forms an ecosystem. The living factors (plants and animals) together form a biotic system and the geographical and diametric factors such as soil, climate, temperature rainfall etc. shen abiotic factors of environment.

Complete answer:
The data given in the table shows species of mosses, shrubs and trees calculated for one hectare of land after every co years based on running ecological study. The shrubs or bush are small to medium sized perennial woody plants that are deciduous or evergreen.

Mosses are the phylum of non-vascular plants that have a unique character of developing spores. These spores take part in the production of reproduction instead of seeds.

On the basis of data surveyed, it is found that the quantity of vegetation is moderate in the year $1800$ with zero losses and $2$ shrubs and $16$ mosses. Their vegetation keeps on growing with time. There is a steady increase till the period $1850$ and then it again decreases during the period $1900.$ There is decrease in vegetation in the year in the year $1900.$ This decrease in vegetation can be due to the natural disaster. Natural disasters can be floods, drought, volcano etc. After this period, there is an increase in vegetation steadily from the4 year $1900$ to $1950$ and then from $1950$ to $2050$.

The process of change of the Ecological community of an area resulting in the formation of a complex community is called ecological succession. The alteration in the environment factors lead to change in vegetation and composition of an environment. From the data it can be concluded that natural disaster according to the year$1850 - 1900$and then the vegetation grows again.

Note: The importance of ecological succession is as follows,
-It is necessary for the development and growth of the ecosystem.
-It starts colonization of new areas.
-It even helps in recolonization of areas which were destroyed due to climatic, biotic and abiotic factors.