Correct Answer: A. disappearing habitats

Correct Answer: D. Reading a book

Correct Answer: C) Antigens

Explanation

In this Biology question, we are asked to identify an option that does not protect the body from harmful effects caused by microorganisms. The options given are Anti toxin, Phagocytes, Antigens, and Antibodies. Anti toxin is a substance that is produced in response to a toxin and neutralizes its effects. Phagocytes are white blood cells that engulf and digest bacteria and other harmful microorganisms. Antibodies are proteins produced by the immune system that specifically recognize and bind to foreign substances, such as viruses or bacteria, and target them for destruction. On the other hand, antigens are substances that trigger the immune system's response by recognizing them as foreign. They are usually found on the surface of microorganisms and other foreign substances. While antigens are important in initiating the immune response, they do not protect the body from the harmful effects of disease-causing microorganisms. Therefore, option C, Antigens, is the correct answer to this question. It is important to note that the immune system is a complex system that involves various types of cells and molecules working together to protect the body from harmful microorganisms. Understanding the functions of these components is crucial in understanding how the immune system works to keep us healthy.

Correct Answer: B. Uric acid

Correct Answer: B. Liver

Correct Answer: D) It lowers the blood pressure

Explanation

The question is asking which of the options is not true about the sympathetic nervous system. The sympathetic nervous system is part of the autonomic nervous system that helps the body respond to stress or danger by stimulating various organs and tissues. Option A states that the sympathetic nervous system stimulates many parts of the body in times of danger, and this is true. In response to danger or stress, the sympathetic nervous system activates the fight-or-flight response, which increases heart rate, dilates pupils, and increases blood flow to muscles. Option B says that the sympathetic nervous system stimulates the heartbeat, and this is also true. The sympathetic nervous system stimulates the heart to beat faster and stronger during times of stress. Option C states that the sympathetic nervous system functions like the adrenal glands. This option is not entirely clear, but it is true that the adrenal glands release hormones in response to sympathetic nerve stimulation. Option D, which is the correct answer, states that the sympathetic nervous system lowers the blood pressure. This is not true. The sympathetic nervous system actually increases blood pressure by constricting blood vessels and increasing heart rate. In summary, the sympathetic nervous system is responsible for the body's response to stress or danger and stimulates various organs and tissues. It increases heart rate, dilates pupils, and increases blood flow to muscles. It does not lower blood pressure, but rather increases it by constricting blood vessels and increasing heart rate.

Correct Answer: D) Succession is often not directional and so difficult to predict

Explanation

This Biology question is asking which statement about plant succession is incorrect. Plant succession is the process of changes in the types of plants that grow in a particular area over time. The options are: Option A: Plant succession is the process of community change at one place over time. Option B: Plant succession is usually measured over the course of several years to hundred years. Option C: Succession proceeds from pioneer to climax phases. Option D: Succession is often not directional and so difficult to predict (Correct). Statements A, B, and C are correct. Statement A explains what plant succession is, which is the process of changes in the types of plants that grow at a particular place over time. Statement B is also correct, as plant succession can take a long time, sometimes several years or even hundreds of years to be completed. Statement C is also correct, as plant succession proceeds from pioneer species to climax species, which are the final and stable plant community that develops in a particular area. Option D is the correct option as it is the only incorrect statement. Succession is often directional and predictable. Pioneer species start the process of succession by colonizing bare land. As the pioneer species grow and develop, they change the environment and make it more suitable for other species to grow. This leads to the growth of new species and an increase in biodiversity. The direction of succession is towards the climax community, which is stable and self-sustaining. In summary, the correct answer to this question is Option D, which states that succession is often not directional and difficult to predict, which is incorrect. Plant succession is directional and predictable

Correct Answer: C. it has a large surface area to volume ratio.

Correct Answer: B. Root hair and mammalian hair

Correct Answer: D. Phytoplankton