Q: The uterus has an external opening known as what? Read this paragraph and choose the correct option from the provided answers: Nervous system Most nematodes possess four longitudinal nerve cords that run along the length of the body in dorsal, ventral, and lateral positions. The ventral nerve cord is better developed than the dorsal or lateral cords. All nerve cords fuse at the anterior end, around the pharynx, to form head ganglia or the "brain" of the worm (which take the form of a ring around the pharynx) as well as at the posterior end to form the tail ganglia. In C. elegans, the nervous system accounts for nearly one-third of the total number of cells in the animal. Reproduction Nematodes employ a variety of reproductive strategies that range from monoecious to dioecious to parthenogenic, depending upon the species under consideration. elegans is a monoecious species and shows development of ova contained in a uterus as well as sperm contained in the spermatheca. The uterus has an external opening known as the vulva. The female genital pore is near the middle of the body, whereas the male's is at the tip. Specialized structures at the tail of the male keep him in place while he deposits sperm with copulatory spicules. Fertilization is internal, and embryonic development starts very soon after fertilization. The embryo is released from the vulva during the gastrulation stage. The embryonic development stage lasts for 14 hours; development then continues through four successive larval stages with ecdysis between each stageL1, L2, L3, and L4ultimately leading to the development of a young male or female adult worm. Adverse environmental conditions like overcrowding and lack of food can result in the formation of an intermediate larval stage known as the dauer larva. Choices: - cervix - ovaries - fallopian tubes - vulva A:
vulva

(Question)
Q: The complement system is a series of proteins constitutively found in the what? Read this paragraph and choose the correct option from the provided answers: Complement System The complement system is a series of proteins constitutively found in the blood plasma. As such, these proteins are not considered part of the early induced immune response, even though they share features with some of the antibacterial proteins of this class. Made in the liver, they have a variety of functions in the innate immune response, using what is known as the "alternate pathway" of complement activation. Additionally, complement functions in the adaptive immune response as well, in what is called the classical pathway. The complement system consists of several proteins that enzymatically alter and fragment later proteins in a series, which is why it is termed cascade. Once activated, the series of reactions is irreversible, and releases fragments that have the following actions: Bind to the cell membrane of the pathogen that activates it, labeling it for phagocytosis (opsonization) Diffuse away from the pathogen and act as chemotactic agents to attract phagocytic cells to the site of inflammation Form damaging pores in the plasma membrane of the pathogen Figure 21.13 shows the classical pathway, which requires antibodies of the adaptive immune response. The alternate pathway does not require an antibody to become activated. Choices: - nucleus - organs - platelets - blood plasma A:
(Answer)
blood plasma

Ques: Q: Hydroelectric power harnesses the energy of what? Read this paragraph and choose the correct option from the provided answers: Moving water has energy ( Figure above ). That energy is used to make electricity. Hydroelectric power harnesses the energy of water moving down a stream. Hydropower is the most widely used form of renewable energy in the world. This abundant energy source provides almost one fifth of the world's electricity. The energy of waves and tides can also be used to produce water power. At this time, wave and tidal power are rare. Choices: - weather - heat - air - water A:
Ans: water

(Q).
Q: What can be formed by converging light rays behind a lens, onto a piece of film? Read this paragraph and choose the correct option from the provided answers: When light rays converge behind a lens, a real image is formed. Real images are useful in that you can place photographic film at the physical location of the real image, expose the film to the light, and make a two-dimensional representation of the world, a photograph. Choices: - a prism - a kaleidoscope - a mirror - a photograph A:
(A).
a photograph

Ques:Q: Mutations that lead to cancer usually occur in genes that control the cell cycle. these include tumor-suppressor genes and what? Read this paragraph and choose the correct option from the provided answers: Mutations that lead to cancer usually occur in genes that control the cell cycle. These include tumor-suppressor genes and proto-oncogenes. Choices: - extinction - oncogenes - apparition - oncogenes - Darkness Oncogenes - proto-oncogenes A:

Ans:proto-oncogenes

Ques: Q: What type of light can you feel as heat but not see and has the longest wavelengths and lowest frequencies? Read this paragraph and choose the correct option from the provided answers: Infrared light is light with the longest wavelengths and lowest frequencies. You can't see infrared light, but you can feel it as heat. Besides the sun, flames and living things give off infrared light. Choices: - solar light - ultraviolet light - thermal light - infrared light A:
Ans:
infrared light