Ques:Q: Which parasite causes downy mildew in grape plants? Read this paragraph and choose the correct option from the provided answers: Plant Parasites Protist parasites of terrestrial plants include agents that destroy food crops. The oomycete Plasmopara viticola parasitizes grape plants, causing a disease called downy mildew (Figure 13.18a). Grape plants infected with P. viticola appear stunted and have discolored withered leaves. The spread of downy mildew caused the near collapse of the French wine industry in the nineteenth century. Choices: - taphrina confusa - epichloe typhina - chrysomyxa ledi - plasmopara viticola A:

Ans:plasmopara viticola
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Ques:Q: What is formed when hot lava cools? Read this paragraph and choose the correct option from the provided answers: Minerals are made by natural processes. The processes that make minerals happen in or on the Earth. For example, when hot lava cools, mineral crystals form. Minerals also precipitate from water. Some minerals grow when rocks are exposed to high pressures and temperatures. Choices: - hydrogen crystals - lava rock - magma crystals - mineral crystals A:

Ans:mineral crystals
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Ques:Q: What is the term for traits that show wide variation, such as height, skin color, and eye color? Read this paragraph and choose the correct option from the provided answers: Usually, traits are polygenic when there is wide variation in the trait. For example, humans can be many different sizes. Height is a polygenic trait, controlled by at least three genes with six alleles. If you are dominant for all of the alleles for height, then you will be very tall. There is also a wide range of skin color across people. Skin color is also a polygenic trait, as are hair and eye color. Choices: - maladaptive traits - inherited traits - recessive traits - polygenic traits A:

Ans:polygenic traits
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Ques:Q: What paired organs that are part of the urinary system play the prime role in excretion? Read this paragraph and choose the correct option from the provided answers: Each of the above organs of excretion is also part of another body system. For example, the large intestine and liver are part of the digestive system, and the lungs are part of the respiratory system. The kidneys are the main organs of excretion. They are part of the urinary system. Choices: - ovaries - liver - lungs - kidneys A:

Ans:
kidneys
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