Pairs of homologous chromosomes, or homologs, share similar features, carry the same genes in the same order, differ in their parent origin and engage in genetic information exchange during meiosis.
Pairs of homologous chromosomes, called homologs, share several key features. Firstly, they are typically the same length and shape, and they carry the same genes in the same order, although the versions of these genes (called alleles) might vary. Secondly, each pair is derived from separate parents; one comes from the mother (maternal chromosome) and one from the father (paternal chromosome). During cell division, particularly during the phase of meiosis, these homologous pairs align with each other, allowing equivalent genetic information to be exchanged, a process known as crossing over.
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Answer:
Decomposers are essential to help an ecosystem to survive.
Explanation:
Decomposers are important because they are crucial for the proper functioning of ecosystems. They recycle the minerals found in dead plants and animals back into the food chain. Ecosystems do not waste energy or materials, and as such, the decomposers capitalize on any remaining energy in a dead organism and make the minerals available to the entire biome.
Without the actions of decomposers, ecosystems would quickly grind to a halt. The green plants, which start the food chain, are unable to grow without nitrogen, potassium and phosphorus. These minerals are released into the environment when decomposers digest their food.
Most decomposers are bacteria. However, many other types of decomposers do exist, including earthworms, protozoans, fungi and millipedes. Earthworms, for example, crawl through leaf litter and soil eating the remains of dead leaves and other organic matter. The earthworms catabolize the energy-rich molecules and excrete the inorganiccompounds. In this way, earthworms essentially produce soil.
Fungi are very important decomposers as well. Many grow in wounded, sick or dying trees. Fungi normally exist as tiny filaments that largely remain out of sight in the soil or within the wood of a tree. However, at certain times, the filaments produce a reproductive structure, known as a mushroom. Sometimes, these mushrooms are visible growing from the soil or out of the wood of a decaying tree.
Key words and phrases:
biome, ecosystem, energy, decomposers, food chain, minerals, organism, environment, bacteria, nitrogen, phosphorus, potassium, molecules, organic matter, catabolize, inorganic compounds
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Nervous control of gastric secretion is provided by the vagus nerve and enteric plexus. The correct option is D.
Gastric secretion refers to the juices and acids that are secreted by the gastric area of the body. These juices and acids are secreted to digest the food material.
Our body's all function are controlled by the nervous system. Digestion is also controlled by the nervous system. The nervous systems include the spinal cord and brain.
The vagus nerve and enteric plexus are responsible for the secretion of digestive juices and acids. The enteric plexus is coming out from the ventral part of the brain stem. The vagus nerve work for carrying the axons to the gastrointestinal tract.
Thus, the correct option is D. the vagus nerve and enteric plexus.
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Gastric secretion is controlled by the vagus nerve and the enteric plexus, part of the autonomic nervous system that directly influences digestive functions. When activated by a stretch receptor, a postganglionic parasympathetic neuron within the stomach's smooth muscle fibers initiates a contraction for digestion.
The nervous control of gastric secretion is provided by the vagus nerve and enteric plexus. This is part of the autonomic nervous system, the nervous tissue that is part of the digestive system. The enteric nervous system, which refers to the digestive organs, has plexuses that can directly influence digestive functions. When the stomach is filled, a neuron connected to the stomach's smooth muscle fibers, activated by a stretch receptor, initiates a contract, allowing the stomach to digest excessive food. This neuron is a postganglionic parasympathetic neuron controlled by a fiber found in the vagus nerve.
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Answer: The correct answer is -
D. a slight limp
Explanation:
Acquired trait is any feature that an organism develops after birth and it is non heritable that is not passed from one generation to the next generation.
On the contrary, inherited trait (such as fur color, length of ears) is present from birth and it is inherited from parents through genetic material.
Slight limp is basically uneven walking that results due to some injury in the legs or because of physical limitation. It means that it is developed after the birth.
Thus, option D) is the right answer.