Question

1. the density of a population is

a. the number of individuals born every year.
b. the proportion of males and females.
c. the number of individuals living in cities.
d. the number of individuals per unit area.

1. what is the meaning of the word \pioneer\ in the term pioneer species?

a. a species that has inhabited an area of land for a very long time and has flourished
b. the last species to die out in an area of land that has gone under serious degradation
c. a species that isnt able to take advantage of harsh physical conditions in environments where there is little competition
d. the species that first colonized a disturbed area and alter the environment to make it favorable to the colonization of other species

1. which of the following is an abiotic factor?

a. sunlight
b. fish swimming in the water
c. a dead deer
d. worm

Explanation:

Question 58

Density of a population is defined as the number of individuals per unit area (or volume in some cases). Option a refers to birth rate - related count, option b is about sex ratio, option c is about urban population count, while option d matches the definition of population density.

A pioneer species is the one that first colonizes a disturbed or barren area and modifies the environment to make it suitable for other species. Option a describes a species with long - term habitation, option b is about a species going extinct, option c is about a species not adapted to harsh conditions. Option d correctly defines a pioneer species.

Abiotic factors are non - living components of an ecosystem. Sunlight is a non - living (abiotic) factor. Fish (option b), a dead deer (option c), and a worm (option d) are all living or once - living (biotic) components.

Answer:

d. the number of individuals per unit area

Question 59