1. Unprotected seeds are found in:
A. cones.
B. perfect flowers.
C. imperfect flowers.
D. fruit.
im confused between A n D
2. The most harmful parasite for plants and animals is the:
A. roundworm.
B. protozoan.
C. fungus.
D. flatworm.
is it A
3. Benthic organisms are found:
A. on the ocean surface.
B. free-swimming anywhere in the ocean.
C. on the ocean bottom.
D. along the ocean shore.
is it C
4. Marsupial animals complete development in:
A. a placenta.
B. water.
C. an egg.
D. a pouch.
is it D
D: FRUIT
1. To determine the correct answer for the first question, we need to understand what unprotected seeds are. Unprotected seeds refer to seeds that are not enclosed within any protective structure.
A. Cones: Cones are the reproductive structures of gymnosperms such as pine trees. They contain seeds, but the seeds are protected within the scales of the cone. Therefore, they are not unprotected seeds.
B. Perfect flowers: Perfect flowers have both male and female reproductive structures, including the production of seeds. However, perfect flowers often have some sort of protective structure around the seed, such as a fruit or a seed pod. Therefore, they are not unprotected seeds.
C. Imperfect flowers: Imperfect flowers are ones that lack either male or female reproductive structures. Since they don't produce seeds, they cannot have unprotected seeds.
D. Fruit: Fruit is the mature ovary of a flowering plant. It often contains seeds within it. However, the seeds are protected by the flesh or skin of the fruit. Therefore, fruit does not contain unprotected seeds.
Based on this information, the correct answer is D. Unprotected seeds are found in fruits.
2. To determine the most harmful parasite for plants and animals, we need to consider the characteristics of each choice.
A. Roundworm: Roundworms are parasites that can infect both plants and animals. While they can cause harm, they may not be the most harmful parasite.
B. Protozoan: Protozoans are single-celled organisms that can be parasitic. Some species can cause harm, but they may not be the most harmful parasite.
C. Fungus: Fungi can cause diseases in plants, known as plant pathogens, and they can also cause harm to animals. However, they may not be the most harmful parasite.
D. Flatworm: Flatworms, also known as platyhelminths, include parasitic species such as tapeworms. They can cause severe harm to both plants and animals, making them a potential answer for the most harmful parasite.
Based on this information, the correct answer is D. The most harmful parasite for plants and animals is the flatworm.
3. Benthic organisms are organisms that live on or in the bottom of a body of water, such as the ocean. Let's consider each option:
A. On the ocean surface: Surface-dwelling organisms are generally not considered benthic organisms.
B. Free-swimming anywhere in the ocean: Free-swimming organisms are not exclusively considered benthic organisms. They can be found throughout different zones of the water column.
C. On the ocean bottom: Benthic organisms are primarily found on the bottom of the ocean, so this answer seems to be the most reasonable choice.
D. Along the ocean shore: Organisms along the ocean shore are typically considered intertidal organisms, not strictly benthic organisms.
Based on this information, the correct answer is C. Benthic organisms are found on the ocean bottom.
4. Marsupials are a group of mammals that give birth to relatively undeveloped offspring and then carry and nurture them in a pouch. Consider each option:
A. A placenta: Placental mammals, such as humans, complete the development of their offspring within the mother's womb, not in a pouch.
B. Water: The completion of development in water is more characteristic of species like fish and amphibians, not marsupials.
C. An egg: Animals that develop from eggs, such as reptiles and birds, do not go through the marsupial process of nurturing their young in a pouch.
D. A pouch: Marsupials are unique in that they complete the development of their offspring within a specialized pouch after birth. So the correct answer is D. Marsupial animals complete development in a pouch.