Test Your IQ On Biology

Explanation
The voice box is also known as the larynx. It is a part of the respiratory system located in the neck, between the pharynx and the trachea. The larynx plays a crucial role in producing sound and facilitating speech. It contains the vocal cords, which vibrate when air passes through, producing sound waves that can be shaped into speech by the mouth and other vocal organs. The other options, pancreas, prostate, and esophagus, are not related to the voice box or its functions.

Explanation
The human brain consists of four main lobes: the frontal lobe, parietal lobe, temporal lobe, and occipital lobe. Each lobe has distinct functions and is responsible for various cognitive processes and sensory information processing. Therefore, the correct answer is four.

Explanation
An upright primate refers to a primate that walks on two legs in an upright position. Hominid is the correct answer because it is a term used to describe modern humans and their close extinct relatives, such as Australopithecus and Homo habilis, who walked upright. Brontosaurus is a dinosaur, Arachnid refers to spiders and scorpions, and Eohippus is an extinct horse-like mammal.

Explanation
Girls need more iron than boys do because they lose iron through menstruation. Iron is an essential nutrient for the production of red blood cells and to prevent iron deficiency anemia. Since girls have a monthly menstrual cycle, they need to replenish the iron lost during this process. Boys, on the other hand, do not experience menstruation and therefore do not require as much iron.

Explanation
The trachea is the correct answer because it is the tube that connects the throat to the lungs and allows air to enter and exit the body. Oxygen is primarily taken in through the respiratory system, and the trachea plays a crucial role in this process by providing a pathway for oxygen to enter the body. The other options, hair, heart, and skin, do not have a direct role in the entry of oxygen into the human body.

Explanation
The auditory nerve is responsible for transmitting sound signals from the cochlea in the inner ear to the brain. It is a cranial nerve that carries information about sound and helps us perceive and interpret auditory stimuli.

Explanation
A host is an organism that provides energy for another organism. In a symbiotic relationship, the host provides a habitat and nutrients for the other organism, known as the parasite. The parasite benefits from the host by obtaining energy and resources necessary for its survival. This relationship is often seen in parasitic organisms such as ticks, fleas, and certain bacteria. The host serves as a source of energy, allowing the parasite to thrive and reproduce.

Explanation
Spontaneous Generation refers to the belief that living organisms can arise from non-living matter. This concept was widely accepted in the past but has been disproven by scientific experiments. According to spontaneous generation, things like maggots appearing on rotting meat or mice emerging from piles of grain were thought to be the result of spontaneous creation. However, through experiments conducted by scientists like Louis Pasteur, it was proven that living organisms can only come from pre-existing living organisms, leading to the rejection of spontaneous generation as a valid explanation for the origin of life.

Explanation
The technical term for windpipe is trachea. The trachea is a tube-like structure that connects the larynx (voice box) to the bronchi in the lungs. It serves as a passage for air to enter and leave the lungs during breathing. The trachea is composed of rings of cartilage which help to keep it open and prevent collapse.

Explanation
The sense of sight allows us to perceive and differentiate colors. Our eyes contain specialized cells called cones that are sensitive to different wavelengths of light, enabling us to see the various colors of the visible spectrum. Through the process of visual perception, our brain interprets these signals and allows us to identify and distinguish different colors in our environment. Therefore, sight is the sense that tells us what color something is.

Explanation
Chromatin refers to the long strands of genetic material found in a cell's nucleus. It consists of DNA molecules tightly coiled around proteins called histones. Chromatin is responsible for packaging and organizing the DNA, allowing it to fit inside the nucleus and regulate gene expression. This structure plays a crucial role in various cellular processes, including DNA replication, transcription, and repair.

Explanation
Saliva is the correct answer because it is the liquid in our mouth that helps soften food. Saliva is produced by the salivary glands and contains enzymes that begin the process of breaking down food, making it easier to swallow and digest. It also helps to keep the mouth moist, which aids in speech and prevents dryness. Saliva plays a crucial role in the overall digestive process by lubricating food and initiating the chemical breakdown of carbohydrates.

Explanation
The largest artery in the human body is the aorta. It is the main artery that carries oxygenated blood from the heart to the rest of the body. The aorta is responsible for distributing blood to all organs and tissues, making it a vital part of the circulatory system.

Explanation
The correct answer is "Skeleton". The skeleton refers to the entire framework of bones in the human body. It provides support, structure, and protection for the body's organs and tissues. The term "skeleton" is used to collectively describe all the bones in the body. Marrow, neurons, and ecosphere are not accurate terms to describe all of our bones.

Explanation
Stimulus directly affects all cell activity by triggering a response or reaction in cells. It is a signal or change in the environment that can cause cells to adjust their behavior or function. Cells respond to stimuli by initiating various processes such as metabolism, growth, division, and communication. This response allows cells to adapt and maintain homeostasis in different conditions. Therefore, stimulus is a crucial factor that directly influences cell activity.