Soal Pts Kelas 7 Semester 2

The smallest unit of living organisms is the cell. Cells are the basic building blocks of life and are responsible for carrying out essential functions within an organism. They are capable of reproducing, obtaining and using energy, and responding to their environment. Cells can exist as single-celled organisms, such as bacteria, or as part of a larger organism, such as a plant or animal. Therefore, the correct answer is A. sel (cell).

The correct answer is A. membran sel. The explanation for this is that the given options are different parts of a cell that can be found in both animals and plants. The cell membrane is a crucial component of all cells, as it acts as a barrier that controls the movement of substances in and out of the cell. It is present in both animal and plant cells, making it the correct answer.

Fungi and bacteria are known as decomposers in an ecosystem. They play a crucial role in breaking down dead organic matter and recycling nutrients back into the environment. Decomposers help in the decomposition process by breaking down complex organic compounds into simpler forms that can be utilized by other organisms. They are responsible for the breakdown of dead plants, animals, and other organic materials, which helps in nutrient cycling and maintaining the balance of the ecosystem.

The correct answer is B. air. This is because the question is asking about the entry of substances or other components into the water environment that disrupt the water quality, which is known as water pollution.

The correct answer is C. 3 dan 4. The explanation for this answer is that the tissues involved in the transportation system of plants are the xylem and phloem tissues. The xylem tissue is responsible for transporting water and minerals from the roots to the rest of the plant, while the phloem tissue is responsible for transporting sugars and other organic compounds from the leaves to other parts of the plant. Therefore, option C, which includes both the xylem and phloem tissues, is the correct answer.

Plastic waste cannot be broken down by microorganisms, leading to its accumulation in the soil and causing soil pollution.

Jaringan meristem apikal pada tumbuhan terdapat pada ujung akar. Meristem apikal adalah jaringan yang terletak di ujung akar atau ujung batang yang bertanggung jawab untuk pertumbuhan panjang tumbuhan. Jaringan ini menghasilkan sel-sel baru yang memungkinkan tumbuhan untuk terus tumbuh dan berkembang.

Kerongkongan bukan organ pernapasan, melainkan bagian dari sistem pencernaan. Organ pernapasan utama terdiri dari hidung, tenggorokan, dan paru-paru.

Jika tikus kebun dibasmi, populasi burung hantu kemungkinan akan menurun. Hal ini disebabkan karena tikus kebun merupakan salah satu makanan utama burung hantu. Jika tikus kebun tidak ada, burung hantu akan kesulitan mencari makanan sehingga populasi mereka kemungkinan akan menurun.

The correct answer is B. burung pipit sebagai konsumen tingkat I. In the given food chain, padi is the producer, burung pipit is the primary consumer (konsumen tingkat I) as it feeds on padi, burung elang is the secondary consumer (konsumen tingkat II) as it feeds on burung pipit, and harimau is the tertiary consumer (konsumen tingkat III) as it feeds on burung elang. Decomposers, on the other hand, break down dead organic matter and recycle nutrients back into the ecosystem.

The correct answer is C. 3 - 4 - 5 - 6. This is the correct order of the components in the food chain. Plankton is at the bottom of the food chain, followed by fish, then snakes, and finally eagles.

The correct answer is B. produsen. In a food pyramid, the biomass refers to the total mass of living organisms at each trophic level. The producers, such as plants and algae, are at the bottom of the food pyramid and are responsible for converting sunlight energy into organic matter through photosynthesis. As a result, they have the largest biomass in the food pyramid as they provide energy and nutrients to the consumers at higher trophic levels.

One of the requirements for water management is that the pH of the water should be in a normal condition. pH is a measure of the acidity or alkalinity of a substance, and in the case of water, a normal pH means that it is neither too acidic nor too alkaline. This is important because water with an abnormal pH can have negative effects on aquatic life, can corrode pipes and infrastructure, and can affect the effectiveness of water treatment processes. Therefore, maintaining a normal pH level is crucial for the proper management of water resources.

One of the causes of cholera in the population is the limited availability of clean water.

The correct answer is C because it follows the correct sequence of organization in living things, starting from cells (sel), then progressing to tissues (jaringan), organs (organ), organ systems (sistem organ), and finally organisms (organisme).

The correct answer is C. tikus dan burung kecil. This is because the question is asking for the labels of numbers 1 and 2 according to the given section. The labels for numbers 1 and 2 are tikus and burung kecil.

Populasi adalah kelompok organisme dari satu spesies yang hidup di tempat yang sama dan memiliki kemampuan untuk melakukan persilangan. Habitat merujuk pada tempat di mana organisme hidup, komunitas merujuk pada kelompok organisme yang hidup bersama dalam suatu area tertentu, dan ekosistem merujuk pada interaksi antara organisme hidup dan lingkungannya. Oleh karena itu, jawaban yang paling sesuai adalah populasi.

Pencemaran yang diakibatkan oleh bakteri termasuk dalam pencemaran biologis. Bakteri adalah organisme hidup yang dapat menyebabkan kerusakan pada lingkungan melalui pelepasan zat-zat berbahaya atau toksin. Pencemaran biologis terjadi ketika organisme hidup seperti bakteri, virus, atau jamur mencemari lingkungan dengan cara menghasilkan atau melepaskan bahan-bahan yang berpotensi merusak ekosistem.

In an ecosystem, producers are organisms that can produce their own food through photosynthesis. In the given options, semanggi and fitoplankton are the only organisms that can perform photosynthesis and produce their own food. Therefore, semanggi and fitoplankton are the correct answer as they function as the producers in the swamp ecosystem.

The correct answer is C. (3) dan (4). The statement (3) "Penggunaan sumber daya alam sebaik" suggests the wise use of natural resources, indicating a sustainable approach. The statement (4) "Mementingkan kelanjutan penggunaaan" emphasizes the importance of considering the continuity of resource use, further supporting the idea of a sustainable management approach. Therefore, the combination of statements (3) and (4) indicates an environmentally conscious management of natural resources.

The correct answer is C because it lists the organs of the digestive system in the correct order: mouth, esophagus, stomach, and intestines. The other options either have the organs listed in the wrong order or include organs that are not part of the digestive system, such as the lungs in option D.

The correct answer is D because recycling plastic waste into handicrafts helps to reduce the amount of plastic waste that ends up in landfills, therefore preventing soil pollution. By turning plastic waste into useful products, it reduces the need for new plastic production and minimizes the environmental impact of plastic waste.

The correct answer is B. polutan because a substance that causes pollution is referred to as a pollutant.

The correct answer explains that the characteristic of the tissue is that it consists of osteons, which are stored in a matrix containing collagen and calcium. This suggests that the tissue being referred to is bone tissue, as osteons are structural units found in compact bone. The presence of collagen and calcium in the matrix further supports this identification, as they are key components of bone tissue.

The graph shows the dissolved oxygen concentration at different points around the river. The point that represents the discharge of waste into the river is indicated by the letter C.

In the given food web diagram, the organism labeled as number 4 is a plant. In an ecosystem, producers are organisms that can produce their own food through photosynthesis. Since plants are capable of photosynthesis, they are considered as producers. Therefore, organism number 4 in the diagram is the producer.

The Golgi apparatus is responsible for secretion in the cell. It receives proteins and lipids from the endoplasmic reticulum, modifies them, and packages them into vesicles for transport to their final destination. This process is known as exocytosis, which is a form of secretion. Therefore, the correct answer is B. sekskresi.

The given passage states that industrial waste has polluted the river and is threatening the ecosystem. To address this pollution, the most effective solution would be to treat the industrial wastewater effectively before disposing of it into the river. This would ensure that the harmful and toxic substances are removed or reduced, minimizing the pollution and its impact on the biota in the ecosystem.

The part of the cell indicated by the letter M is the ribosome. Ribosomes are responsible for protein synthesis in the cell. They read the messenger RNA (mRNA) and use it as a template to assemble amino acids into proteins. Therefore, option A, "tempat sintesis protein" (the place for protein synthesis), is the correct answer.

The correct answer is B. The decrease in the number of green grasshoppers is due to predation by their predators. After the rice is harvested, the green grasshoppers become more vulnerable to being eaten by predators, resulting in a decrease in their population. This explanation suggests that the green grasshoppers are being consumed by other organisms in the ecosystem, leading to a decline in their numbers.