Question

Помогите пожалуйста биология 9 класс 1. Дайте определение популяции 2. Выберите правильное утверждение. Певчий дрозд и черный дрозд, обитающие в одном лесу, составляют: А) одну популяцию одного вида Б) две популяции двух видов В) две популяции одного вида Г) одну популяцию разных видов 3. Перечислите свойства популяции 4. Многие животные летом живут парами (волки, синицы), а зимой образуют стаи. Объясните, с чем это связано? 5. Из списка факторов выберите те, которые способствуют росту численности популяции: высокая плотность населения -благоприятные условия жизни -избыток территории -отсутствие хищников -болезни -обилие паразитов -отсутствие паразитов -низкая плотность населения -неблагоприятные климатические условия -обилие пищи -обилие конкурентов -нехватка территории

Answer 1

Ответ:

1-4

Объяснение:

1)

Популя́ция — совокупность организмов одного вида, длительное время обитающих на одной территории и частично или полностью изолированных от особей других таких же групп

2)

Певчий дрозд и черный дрозд обитающие в одном лесу составляют (б) две популяции двух видов.

3)

К свойствам популяции относятся численность, плотность, рождаемость и смертность.

4)

Многие формы поведения у пживотных обусловлены инстинктами – сохраненными естественным отбором комплексами безусловных рефлексов. Весной у животных начинает проявляться инстинкт размножения, поэтому они образуют пары. Зимой образуют стаи тоже на основе инстинкта, который помогает легче находить пищу, защищаться от врагов и т

Answer 2

Definition of Population

A population is a group of individuals of the same species that live in the same area and can interbreed. It is a fundamental concept in biology and is used to study the dynamics and characteristics of a particular species within a specific geographic region [[1]].

Correct Statement about Thrushes

The correct statement about the song thrush and the blackbird, which both inhabit the same forest, is that they constitute two populations of the same species. This is because they are both members of the same species (birds) but exist as separate populations within the forest [[2]].

Properties of a Population

The properties of a population include:

1. Size: The number of individuals in the population. 2. Density: The number of individuals per unit area or volume. 3. Distribution: The spatial arrangement of individuals within the population. 4. Age structure: The proportion of individuals in different age groups. 5. Sex ratio: The proportion of males to females in the population. 6. Birth rate: The number of births per unit time. 7. Death rate: The number of deaths per unit time. 8. Growth rate: The rate at which the population size changes over time. 9. Migration: The movement of individuals into or out of the population. 10. Genetic variation: The diversity of genetic traits within the population [[3]].

Formation of Flocks in Animals

The formation of flocks or groups by many animals during winter is often related to the availability of resources and the need for protection. During winter, resources such as food and shelter may become limited, leading animals to aggregate in larger groups to increase their chances of survival. By forming flocks, animals can benefit from collective foraging, predator detection, and thermoregulation. Additionally, larger groups may provide better protection against predators, as there are more individuals to watch for danger and to dilute the risk of predation [[4]].

Factors Affecting Population Growth

The factors that contribute to population growth include:

1. High population density: When the population density is high, individuals have more opportunities to interact and reproduce, leading to increased population growth. 2. Favorable living conditions: Suitable environmental conditions, such as ample food, water, and shelter, promote population growth. 3. Absence of predators: The absence or low abundance of predators reduces mortality rates and allows population numbers to increase. 4. Lack of diseases: The absence or low prevalence of diseases reduces mortality rates and allows population numbers to increase. 5. Abundance of resources: When there is an abundance of resources, such as food and habitat, populations can grow more rapidly. 6. Absence of parasites: The absence or low prevalence of parasites reduces mortality rates and allows population numbers to increase. 7. Low population density: In some cases, low population density can lead to increased population growth, as individuals have more resources available and face less competition for mates and resources [[5]].

It's important to note that population growth is influenced by a combination of these factors and can vary depending on the specific species and environmental conditions.

I hope this helps! Let me know if you have any further questions.