How many biological chains are there? How to calculate the number of biological chains?

First of all, we must find the starting point, generally the plant as the starting point, then find the predator, and then find the predator of the predator, for example, look at the picture, the same reason. First, the animals are arranged according to predators and ** eaters, and then there are several in turn, and there are 6 biological chains in the figure.

Start at the bottom, count how many there are, and then count up each one.

Generally speaking, the number of food chains is not too complicated, and it is very simple to count such a number as long as there is no shadow in your heart.

The chain relationship between the transformation of matter and the transformation of energy formed between various organisms in nature. For example, green plants are the food of herbivores, herbivores are the food of carnivores, and some carnivores are food of other carnivores.

Extended information: The leaves and fruits of plants provide food for insects, insects become a food source for birds, birds can lead to eagles and snakes, and with eagles and snakes, rodents will not become plagued ......

When animal droppings and carcasses are returned to the soil, microorganisms in the soil break them down into simple compounds that provide nutrients to the plant and cause it to grow new leaves and fruits.

Biological chains. It can also be understood that the leaves and fruits grown by plants in nature provide food for insects, and insects become a food source for birds.

There is a relatively balanced biological chain in nature, even if it has been modified by humans, such as cities, villages, and even farmland, for a long period of time, without human interference and destruction, the biological chain will gradually tend to be balanced. And keep it for a certain relative time.

It is a food chain that starts with herbaceous plants and continues until there are no natural predators.

As shown in the figure below: 1. Formula method: the number of bifurcations + 1 - the number of bifurcation points = the number of food chains (there are 7 bifurcations in the above picture, and 3 bifurcation points include rats, plants, and birds, 7 + 1-3 = 5).

2, several bifurcations, this food chain is bifurcated in a green plant division, wherein there are 2 branches bifurcated at B along the branch road, that is, there are 2 food chains; There is no bifurcation along the branch road, that is, there is 1 food chain; There are 2 branches along the branch road at C, that is, there are 2 chains of food and paddle wisdom. Therefore, the number of pieces in the food chain is 5.

1. Grass-insect-bird-eagle.

2. Grass-rat-snake-eagle.

3. Grass-rat-eagle.

4, Grass - Rabbit - Eagle.

You can write all these plants and animals on paper, the plants as producers on **, and the animals around the surrounding plants.

What is eaten is connected by arrows, and each time it is counted from the producer to the most advanced consumer, it is a food chain.

But beware of advanced consumers, like the eagle in the example, which can eat both rats and snakes. Therefore, it can be connected to the grass-rat-snake to become a food chain, and it can be directly connected to the grass-rat to form another food chain.

I hope the brothers downstairs don't talk nonsense, a complete food chain must start with the producer and end with the highest trophic level that the chain can reach.

And the conditions given in the example are that birds don't eat grass, and snakes don't eat birds.

As shown in the figure below: 1. Formula method: the number of bifurcations + 1 - the number of bifurcation points = the number of food chains (there are 7 bifurcations in the above picture, and 3 bifurcation points include rats, plants, and birds, 7 + 1-3 = 5).

2, several bifurcations, this food chain is bifurcated in a green plant division, wherein there are 2 branches bifurcated at B along the branch road, that is, there are 2 food chains; There is no bifurcation along the branch road, that is, there is 1 food chain; There are 2 branches along the branch road at C, that is, there are 2 chains of food and paddle wisdom. Therefore, the number of pieces in the food chain is 5.