Generate Quiz 68D3C674ABB38

Although their structures and embryonic origins differ, analogous organs serve a similar purpose. Although they have different functions, homologous structures have a similar embryonic origin. The bones in a human arm, for instance, are homologous to those in a whale’s front flipper. The wings of a bird or a butterfly, however, are not homologous but rather comparable.

Option C (Fact) is correct (3 pairs of genes control skin color in man). Multiple genes, specifically three pairs of genes, determine human skin color. The pigment melanin, which gives skin, hair, and eyes their color, is produced and distributed according to these genes. The quantity, kind, and distribution of melanin in the skin are all determined by the three gene pairs that contribute to variability in skin color.

Any given vessel’s diameter may also fluctuate regularly throughout the day in reaction to chemical and neurological cues that cause vasoconstriction and vasodilation.

Due to its dominance, the trait for red flowers (R) can manifest in both homozygous (RR) and heterozygous (Rr) conditions, both of which will produce red flowers.

A “Genus” is a grouping of closely related species.

“Breathing” is the process by which animals absorb oxygen (O2) from the atmosphere and expel carbon dioxide (CO2) into it. It cannot be “respiration” because glucose is broken down to provide energy during cellular respiration. It cannot be “osmosis” or “diffusion” because both entail the passage of substances across a gradient of concentration.
During respiration, the animals take in oxygen and exhale carbon dioxide. In living things, respiration is the process by which energy is produced, usually through the intake of oxygen and the expulsion of carbon dioxide from the oxidation of complex organic substances.

“Echinodermata” is the right response to this question. While “Annelids,” “Arthropods,” and “Molluscs” are protostomes, echinoderms, chordates, and hemichordates are deuterostomes, meaning that their anus develops first.

The hydrolytic enzymes found in membrane-bound, dense granular aggregates called lysosomes are primarily in charge of intracellular and extracellular digestion.

Any of the following conditions can cause chlorosis: a buildup of waste materials in leaves, a lack of chlorophyll, or a shortage of minerals. Depending on the plant species, the growing environment, and other variables, the precise cause of chlorosis can change. Chlorosis can occasionally be brought on by a mix of these causes. For instance, plants with low iron levels may also build up waste materials in their leaves, which can cause chlorosis. Chlorosis can also result from nutrient deficiencies brought on by a lack of minerals in the soil. Option D is therefore the right choice.

The efficiency with which a photosynthetic pigment absorbs various light wavelengths to power the process of photosynthesis is represented by the action spectrum. The action spectrum’s two peaks show which light wavelengths are most effectively absorbed by the relevant photosynthetic pigment or pigments. The energy required to start the light-dependent processes of photosynthesis is provided by these absorbed photons.

One steroid hormone that is essential to the growth and control of the female reproductive system is estrogen. It is mostly produced by the ovaries and aids in maintaining pregnancy, promoting secondary sexual traits in females, and regulating the menstrual cycle.

That is the right answer. Animals, including humans, use glycogen, a highly branched polymer composed of glucose units, as their main source of energy storage. Glycogen, which is abundantly stored in human muscles, serves as an easy-to-access source of glucose when the body needs more energy, as during physical activity. Glycogen is broken down into glucose units when energy is required. Cell respiration then uses these glucose units to produce energy for other cellular processes like muscle contraction.

When you touch a hot surface with your fingertips, for instance, the sensory neurons will fire and send signals to the rest of the nervous system about the information they have received. Sensory neurons are the nerve cells that are activated by sensory input from the environment.

There are 23 pairs of chromosomes in every man’s body. Two sex chromosomes make up one of these pairs. We refer to these as the X and Y chromosomes. The mother inherits one of these, while the father inherits the other. Males have one X and one Y chromosome, whereas females have two X chromosomes. In females, a recessive mutation can be overridden by a normal, unaltered, or healthy gene, suppressing the disorder. Only in females with two copies of the recessive mutation—one on each X chromosome—disorders linked to X-linked recessive mutations typically occur. In this instance, it cannot be overridden by a dominant “healthy” gene. However, males only have one X chromosome, and they will have the disorder if it has a recessive mutation.

When the diaphragm contracts during inspiration, its dome shape flattens, while the rib cage moves forward and upward when the external intercostal contracts and the internal intercostal relaxes. The thoracic cavity’s inner space expands as a result of these two occurrences. As a result, the pressure in the lungs and thorax is lowered below atmospheric pressure. The thorax’s volume rises as its pressure falls (NBF, page 9). Option E is therefore the right response.

Pain, touch, sound, and sight should all be referred to as “sensation.”
The process by which our sensory organs pick up environmental cues and send signals to the brain is referred to as sensation.

A symplast pathway is the movement of cells via plasmodesmata. An apoplast pathway is a means of passage through cell walls to the cell walls of other cells.

Since stomata, which make up 1-2 percent of the leaf surface, are microscopic pores that allow gases like CO2, O2, and H2O to exchange with the atmosphere, Option C is accurate.

Because humans have one pair of sex chromosomes and 22 pairs of autosomes, the odds of a baby being either a boy or a girl are always 50%. The child’s sex is genetically determined by the heterozygous male and the homozygous female. There are two kinds of sperm: those with an X chromosome, which result in a girl being born, and those with a Y chromosome, which result in a boy. ‘50%’ is the right response, then.

In the context of bacteria, protoplasm refers to the whole contents of a bacterial cell, excluding exterior features like as the capsule, slime, cell wall, and cell membrane. It consists of the following main parts: Organelles, ribosomes, nucleoids, cytoplasm, and inclusion bodies.