Question

Решить задачи срочно !!! Стебель растения имеет сложное внутреннее строение. Почему? Дайте развернутый, обоснованный ответ. Задача 2 Одинаковой ли будет ширина годичного кольца, образовавшегося у разных деревьев за этот год? Почему? Укажите как можно большее количество причин, которые могут повлиять на процесс образования годичных колец у растений.

Answer 1

ЗАДАЧА 1: Стебель- <<ось>> побега. Он выполняет опорную функцию, <<держит>> на себе листья,почки,цветки,плоды и выносит их к свету. Стебель осуществляет также транспортирную функцию. По нему передвигаются вода и питательные вещества от одних органов к другим. 
Информация взята:
Биология. 5-6 класс. 
Л.Н. Сухорукова
В.С. Кучменко 
И.Я. Колесникова

Answer 2

Why does the stem of a plant have a complex internal structure?

The stem of a plant has a complex internal structure due to several reasons:

1. Transportation of water and nutrients: The stem serves as a conduit for the transportation of water, minerals, and nutrients between the roots and the leaves of a plant. This requires a complex network of tissues, including xylem and phloem, which are responsible for the upward movement of water and the downward movement of sugars and other organic compounds [[1]].

2. Support and stability: The stem provides support and stability to the plant, allowing it to stand upright and resist external forces such as wind or gravity. To achieve this, the stem contains specialized tissues, such as collenchyma and sclerenchyma, which provide strength and rigidity [[2]].

3. Growth and development: The stem is responsible for the growth and development of the plant. It contains meristematic tissues, such as the apical meristem, which are responsible for cell division and the production of new cells. These new cells differentiate into various types of tissues, contributing to the complex structure of the stem [[3]].

4. Storage of nutrients: Some plants store nutrients, such as starch or water, in their stems. These storage tissues contribute to the internal complexity of the stem [[4]].

5. Reproduction: In some plants, the stem plays a role in reproduction. For example, in certain species, stems can produce adventitious roots or buds, which can develop into new plants. This reproductive function adds to the complexity of the stem's internal structure [[5]].

In summary, the complex internal structure of a plant's stem is necessary for the transportation of water and nutrients, support and stability, growth and development, storage of nutrients, and reproduction.

Will the width of the annual ring formed in different trees be the same for a given year? Why?

No, the width of the annual ring formed in different trees will not be the same for a given year. The width of the annual ring is influenced by various factors, including:

1. Climate conditions: Climate conditions, such as temperature and precipitation, can significantly affect the growth of trees. In regions with favorable conditions, trees tend to grow faster, resulting in wider annual rings. Conversely, unfavorable conditions can lead to slower growth and narrower rings [[6]].

2. Availability of resources: The availability of resources, such as water, sunlight, and nutrients, can vary between different trees and locations. Trees with access to abundant resources are likely to have wider annual rings, indicating better growth [[7]].

3. Tree age and species: The age and species of a tree can also influence the width of its annual rings. Younger trees generally have wider rings compared to older trees, as they are still in the rapid growth phase. Additionally, different tree species have different growth rates, which can result in variations in annual ring width [[8]].

4. Competition: Trees growing in dense forests or crowded environments may experience competition for resources, which can affect their growth. In such cases, the annual rings may be narrower due to limited access to resources [[9]].

5. Disease and pests: Trees affected by diseases or pests may exhibit reduced growth, leading to narrower annual rings [[10]].

In conclusion, the width of the annual ring formed in different trees for a given year will vary due to factors such as climate conditions, availability of resources, tree age and species, competition, and the presence of diseases or pests.