Organisms And Populations

Answer (b) Hydrilla

Answer (b) Typha

Answer (c) Halophytes

The correct answer is option (A): Eurythermal
Eurythermal: Eury means wide range (broad) and thermal means temperature. These are the organisms that can tolerate a wide range of temperatures. Examples: Humans, cows, monkeys.
Stenohaline: Haline means salinity and steno means narrow. Stenohalines are organisms that cannot tolerate a wide range of changes in salinity. Example: Solman, eels
Stenothermal: These are the organism that cannot tolerate a wide range of temperatures. Example: Penguin, python
Euryhaline: These are the organism that can tolerate a wide range of salinity. Example: European green crab and common molly
Therefore the answer is Eurythermal

The correct answer is option (A): Natality and Immigrati
Population density is the per-person unit area. There are four factors that determine the population density of an area. They are: Immigration: This is the action of people coming from outside to live in a certain place. Emigration: This is the action of leaving a place and moving to another. Natality: This is the ratio of number of birth to the size of the population. This is also known as the birth rate. Mortality: This is the number of death in a population at a given time. So out of these, in order to increase the population density, natality, and immigration are required.