Correct Answer: D) gametes

Explanation

In sexual reproduction, organisms produce special cells called gametes which are used to unite with the opposite sex to form a new individual. These gametes are produced by mature individuals of sexually reproducing species. The question is asking for the name of these sexual reproductive units. The options given are sperms, ova, zygotes, and gametes. Sperms are the male gametes produced by males while ova are the female gametes produced by females. Zygotes, on the other hand, are the cells formed as a result of the fusion of gametes during fertilization. Therefore, the correct answer to this question is option D: gametes. Gametes are the sexual reproductive units produced by mature individuals of sexually reproducing species of organism. It is important to note that gametes are haploid cells, meaning they contain half the number of chromosomes compared to the somatic cells of the organism. This is important because during fertilization, when two gametes fuse, the resulting zygote will have the normal number of chromosomes of the species. Overall, gametes are essential for sexual reproduction as they are the cells that unite during fertilization to form a new individual with a unique combination of genetic material from both parents.

Correct Answer: A. dominant

Correct Answer: D) proteins

Explanation

Protein digestion occurs in the stomach and duodenum in which 3 main enzymes, pepsin secreted by the stomach and trypsin and chymotrypsin secreted by the pancreas, break down food proteins into polypeptides that are then broken down by various exopeptidases and dipeptidases into amino acids. The correct answer is D

Correct Answer: C. the difference in concentration of the two media is high

Correct Answer: C. the bacteria

Correct Answer: D. catalyst

Correct Answer: A) 46

Explanation

In humans, the genetic material is stored in structures called chromosomes. The chromosome number in humans refers to the total number of chromosomes found in the nucleus of a human cell. The question is asking about the chromosome number in humans. The options provided are 46, 23, 92, and 58. The correct answer is option A, 46. This means that a human cell typically has 46 chromosomes, which are arranged in 23 pairs. Each pair consists of two homologous chromosomes, one inherited from each parent. It is important to note that chromosome number can vary across different species. For example, some species of animals have only a few chromosomes, while others have hundreds. In humans, any deviation from the normal chromosome number can lead to genetic disorders such as Down syndrome, which is caused by having an additional copy of chromosome 21. Overall, understanding the chromosome number in humans is an important aspect of genetics and can help us better understand genetic disorders and inheritance patterns.

Correct Answer: B) Metaphase

Explanation

During mitosis, the cell undergoes several stages in which the chromosomes are replicated and divided into two identical sets. The shape of the chromosome is best studied during the metaphase stage of mitosis. During metaphase, the replicated chromosomes align themselves along the equator of the cell, and their shape becomes more distinct and visible under a microscope. This alignment is important for ensuring that each resulting daughter cell receives a complete set of chromosomes. In contrast, during prophase, the chromosomes condense and become visible, but they are not yet arranged in a line. During anaphase, the chromosomes separate and move towards opposite poles of the cell, while during telophase, a new nuclear envelope forms around each set of chromosomes. Cytokinesis is the final stage of cell division, in which the cytoplasm divides to form two separate daughter cells. Therefore, the correct answer to this question is option B: Metaphase.

Correct Answer: A) guard cells

Explanation

Stomata are tiny openings on the surface of plant leaves that allow for gas exchange. The opening and closing of stomata is an important process that helps plants regulate water loss and uptake, as well as the exchange of gases like carbon dioxide and oxygen. The question is asking about the mechanism that controls the opening and closing of stomata. The correct option is A, guard cells. Guard cells are specialized plant cells that surround each stomatal pore and control its opening and closing. When the guard cells are turgid, or swollen with water, they bow out and create an opening for gas exchange. When the guard cells are flaccid, or limp, they close the stomatal pore to prevent water loss. The mechanism for opening and closing the stomata is complex and involves a number of different factors, including the concentration of ions like potassium and chloride within the guard cells, the movement of water in and out of the cells, and the presence of hormones like abscisic acid. By adjusting these factors, plants are able to open and close their stomata in response to changes in environmental conditions like temperature, humidity, and light. Overall, understanding the mechanism of stomatal opening and closing is an important part of understanding how plants function and how they respond to their environment. It allows us to better appreciate the complex interactions between plants and their surroundings, and to develop new strategies for improving crop yields and conserving water resources

Correct Answer: A) de-oxygenated blood from the right ventricle to the lungs

Explanation

The question is asking about what the pulmonary artery does. The pulmonary artery is a blood vessel that carries blood away from the heart and towards the lungs. It is important to note that there are two types of blood: oxygenated blood, which is rich in oxygen, and deoxygenated blood, which has less oxygen. The options given are: A. de-oxygenated blood from the right ventricle to the lungs (Correct) B. oxygenated blood from the right ventricle to the lungs C. oxygenated blood from the left ventricle to the right auricle D. de-oxygenated blood from the left ventricle to the right auricle To answer the question, we need to determine which option is correct. The correct answer is A, which says that the pulmonary artery carries de-oxygenated blood from the right ventricle to the lungs. This is because the right ventricle of the heart pumps deoxygenated blood to the lungs through the pulmonary artery. In the lungs, the blood picks up oxygen and releases carbon dioxide, which is then exhaled out of the body. It is important to understand the difference between oxygenated and deoxygenated blood, and how they are transported through the body. Oxygenated blood is carried by the arteries and veins to supply oxygen to the body's tissues, while deoxygenated blood is carried back to the heart and lungs to be replenished with oxygen. In summary, the pulmonary artery carries deoxygenated blood from the right ventricle of the heart to the lungs, where it picks up oxygen and releases carbon dioxide.