Ques: Q: What important and unusual physical property (for birds) do ostriches and penguins share? Read this paragraph and choose the correct option from the provided answers: There are about 10,000 living species of birds. Almost all of them can fly. Flying birds are classified in 29 orders. Most species belong to the order of perching birds. A few birds are flightless, such as the ostrich and penguin, but they evolved from a flying ancestor. Choices: - waterproofness - webbed feet - bonelessness - flightlessness A:
Ans: flightlessness

Ques: Q: Binary fission is an example of which type of production? Read this paragraph and choose the correct option from the provided answers: Binary fission is a type of asexual reproduction. It occurs when a parent cell splits into two identical daughter cells. This can result in very rapid population growth. For example, under ideal conditions, bacterial populations can double every 20 minutes. Such rapid population growth is an adaptation to an unstable environment. Can you explain why?. Choices: - primitive - algal - sexual - asexual A:
Ans: asexual

Ques: Q: In birds, lightweight air-filled bones and a large four-chambered heart are examples of adaptations for what purpose? Read this paragraph and choose the correct option from the provided answers: Birds are endothermic tetrapod vertebrates. They are bipedal and have wings and feathers. Their organ systems are adapted for flight. For example, they have light-weight air-filled bones and a large four-chambered heart. Birds also have relatively large brains and a high level of intelligence. Choices: - speed - long lifespan - mating - flight A:
Ans: flight

Ques: Q: What disease is caused when the oomycete plasmopara viticola parasitizes 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 23.33). Grape plants infected with P. viticola appear stunted and have discolored, withered leaves. The spread of downy mildew nearly collapsed the French wine industry in the nineteenth century. Choices: - dainty mildew - alkaline mildew - toxic mildew - downy mildew A:
Ans:
downy mildew