(1) Analysis of the diagram shows that the food web includes: grass → rabbit → owl, grass → mouse → owl, grass → herbivorous insect → insectivorous bird → owl, grass → herbivorous insect → toad → snake → owl , grass → rat → snake → owl, a total of 5 food chains.
(2) Organisms occupying the third trophic level of this food web include insectivorous birds, toads, snakes and owls, and the organism at the highest consumer level is the owl.
(3) If rats die in large numbers, the number of owls feeding on rabbits will increase, so the number of rabbits will decrease in a short time.
(4) The total energy flowing through the ecosystem is the total amount of solar energy fixed by the grass; the flow of energy is characterized by a unidirectional flow and a gradual decrease.
The answer is therefore:
(1) 5
(2) Owl, insectivorous bird, toad,snake (in no particular order)< /p>
(3) Reduction
(4) The total amount of solar energy fixed by the grass flows in one direction and decreases step by step
p>In the food chain "grass → locust → sparrow → snake → owl" Among them, the one with the least energy gain is ( )A. Owl B. Sparrow C． Snake D. Locust
(1) Photosynthesis is a biochemical process in which green plants convert carbon dioxide and water into organic matter (mainly starch) and release oxygen under the action of light, the original energy source of the ecosystem. is solar energy;
(2) Depending on whether there are vertebrae in the body, the consumers in the picture can be divided into two categories. One category is insectivorous birds, snakes, frogs, rabbits. rats and owls; The other type is that of spiders and herbivorous insects;
(3) Evolvesion of animals: coelenterates → annelids → molluscs → arthropods → fish → amphibians → reptiles → birds → Mammals, owls are mammals, herbivorous insects and spiders are arthropods. Therefore, their genetic relationship is the most distant;
(4) The biological taxonomic units, from largest to smallest, are kingdom, phylum, class, order, family, genus and species. The Kingdom is the largest classification unit, with seven levels in total. The most basic unit of classification is the species. The larger the taxonomic unit, the fewer common characteristics it contains and the more biological species it contains; the smaller the taxonomic unit, the more common characteristics it contains and the fewer biological species it contains;
( 5) The food chain is the relationship between consumers and producers who eat and are eaten . Each channel hasFood should start with the producer (the green plant) and continue until there are no other consumers in the ecosystem eating it. The longest is: grass → herbivorous insect → spider → frog → snake → owl;
(6) A complete ecosystem includes: abiotic parts and biotic parts. The abiotic part includes sunlight, air, moisture, soil, etc., and the biotic part includes producers, consumers, and decomposers. The food chain describes the food relationship between producers and consumers. Thus, among the components of this ecosystem, the biological part still lacks decomposers.
So the answer is: (1) Photosynthesis; (2) Spider;(3) Spiders, herbivorous insects (4) Species (5) Grass → Herbivorous insects → Spiders → Frogs → Snakes → Owls (6) Decomposers.
What happens when light shines on an opaque object?
Dans an ecosystem, what determines the number of organisms is the energy present in the ecosystem. This determines that most food chains generally only have 3 to 4 trophic levels. Generally speaking: from the energy supply to the next trophic level, only 10 to 20% of the energy can flow into the next trophic level. For example: the first trophic level: grass, the fixed solar energy is 1000 kilojoules, then the. second trophic level The first trophic level can get up to 200 kilojoules, and the third trophic level can get up to 40 kilojoules, it can be concluded that the energy flow decreases step by step along the food chain. way, and does not circulate. We see that in an ecosystem, the higher the trophic level, the less energy circulates in the body. So, in the food chain “grass → locust → sparrow → snake → owl”, the owl receives the least energy.
Alors choose: A.
What happens when light shines on an opaque object is that the light is reflected by the object, the light is absorbed by the object, light is transmitted by the object and light is refracted by the object. The relevant content is as follows:
1. Reflection of light from an object refers to the phenomenon that when light propagates towards different materials, it changes the direction of propagation at the object. interface and returns to the original hardware. Light reflects when it comes into contact with water, glass and many other surfaces. When light changes direction of propagation at the interface between two substances and returns to the original substance, we speak of light reflection.
2. Absorption of light by an object refers to the phenomenon that when light propagates towards different substances, some of the lighte changes the direction of propagation at the interface and enters another substance. Once light is absorbed by an object, its energy is converted into other forms of energy such as thermal energy and chemical energy.
3. Object light transmission refers to the phenomenon that light can pass through an object and form a bright area on the other side of the object. When light is transmitted through an object, the light enters the object and is neither absorbed nor reflected by the object, but is scattered or refracted within the object, allowing the light to pass through on the other side of the object, thus forming a space. bright area. This phenomenon usually occurs in transparent materials like glass, water, etc.
4. Refraction of light by objects refers to the phenomenon that when light propagates to different materials, it changes the directionof propagation at the interface. When light arrives obliquely from one medium to another, the direction of propagation is deviated. This phenomenon is called refraction of light. For example: insert chopsticks into a cup filled with water. You can visually see that the chopsticks are broken and out of alignment.
Content associated with lighting
1. Advantages and disadvantages of lighting: Advantages, proper lighting can bring people visual health, clarity, sleep and learn to improve. work efficiency and other aspects, and improve the quality of life to a certain extent. Disadvantages, too strong natural light and artificial light sources for too long will cause damage to human eyes and skin and may cause visual fatigue, myopia, skin damage and other problems.
2. Applications of light include: Light regulates a seie physiological processes, including sleep, metabolism, etc., and is of great importance for maintaining the physiological homeostasis of organisms. Light can affect people's moods, and sufficient light can make them happy. Lighting affects human vision, and lighting can improve human perception. Light can improve photosynthesis in plants and promote their growth.
3. The effect of light on plant respiration is that when there is light, plants will produce oxygen for respiration, and the carbon dioxide produced by respiration will also be used for photosynthesis; plants can only Oxygen is obtained from the air for respiration, and the carbon dioxide produced is also emitted into the air.