Q: Q: What female flower structure, which is part of the pistil, receives the pollen grains and passes them to the ovary? Read this paragraph and choose the correct option from the provided answers: Flowers are the reproductive organs of plants. Each pea plant flower has both male and female parts. The anther is part of the stamen, the male structure that produces male gametes (pollen). The stigma is part of the pistil, the female structure that produces female gametes and guides the pollen grains to them. The stigma receives the pollen grains and passes them to the ovary, which contains female gametes. Choices: - sepal - style - ovary - stigma A:
A: stigma

Q: Q: What do erythrocytes carry and deliver to tissues in the body? Read this paragraph and choose the correct option from the provided answers: The cell found in greatest abundance in blood is the erythrocyte. Erythrocytes are counted in millions in a blood sample: the average number of red blood cells in primates is 4.7 to 5.5 million cells per microliter. Erythrocytes are consistently the same size in a species, but vary in size between species. For example, the average diameter of a primate red blood cell is 7.5 l, a dog is close at 7.0 l, but a cat's RBC diameter is 5.9 l. Sheep erythrocytes are even smaller at 4.6 l. Mammalian erythrocytes lose their nuclei and mitochondria when they are released from the bone marrow where they are made. Fish, amphibian, and avian red blood cells maintain their nuclei and mitochondria throughout the cell's life. The principal job of an erythrocyte is to carry and deliver oxygen to the tissues. Leukocytes are the predominant white blood cells found in the peripheral blood. Leukocytes are counted in the thousands in the blood with measurements expressed as ranges: primate counts range from 4,800 to 10,800 cells per l, dogs from 5,600 to 19,200 cells per l, cats from 8,000 to 25,000 cells per l, cattle from 4,000 to 12,000 cells per l, and pigs from 11,000 to 22,000 cells per l. Lymphocytes function primarily in the immune response to foreign antigens or material. Different types of lymphocytes make antibodies tailored to the foreign antigens and control the production of those antibodies. Neutrophils are phagocytic cells and they participate in one of the early lines of defense against microbial invaders, aiding in the removal of bacteria that has entered the body. Another leukocyte that is found in the peripheral blood is the monocyte. Monocytes give rise to. Choices: - Helium - carbon - oxide - oxygen A:
A: oxygen

Q: Q: Visible light can be split into colors with the use of a what? Read this paragraph and choose the correct option from the provided answers: The Figure above shows how the electromagnetic spectrum displays a wide variation in wavelength and frequency. Radio waves have wavelengths of as long as hundreds of meters, while the wavelength of gamma rays are on the order of 10 -12 m. The corresponding frequencies range from 10 6 to 10 21 Hz. Visible light can be split into colors with the use of a prism ( Figure below ), yielding the visible spectrum of light. Red light has the longest wavelength and lowest frequency, while violet light has the shortest wavelength and highest frequency. Visible light wavelength ranges from about 400 700 nm with frequencies in the range of 10 14 Hz. Choices: - spectrum - convex lenses - kaleidoscope - prism A:
A: prism

Q: Q: Where are the oceans most polluted? Read this paragraph and choose the correct option from the provided answers: The oceans are most polluted along coasts. Why do you think that's the case? Of course, it's because most pollution enters the oceans from the land. Runoff and rivers carry the majority of pollution into the ocean. Many cities dump their wastewater , water mixed with waste, directly into coastal waters. In some parts of the world, raw sewage and trash may be thrown into the water ( Figure below ). Coastal water may become so polluted that people get sick if they swim in it or eat seafood from it. The polluted water may also kill fish and other ocean life. Choices: - in warmer waters - on the ocean floor - along reefs - along coasts A:
A: along coasts