Q: For fertilization to occur in angiosperms, pollen has to be transferred to the stigma of what? Read this paragraph and choose the correct option from the provided answers: 32.2 Pollination and Fertilization For fertilization to occur in angiosperms, pollen has to be transferred to the stigma of a flower: a process known as pollination. Gymnosperm pollination involves the transfer of pollen from a male cone to a female cone. When the pollen of the flower is transferred to the stigma of the same flower, it is called self-pollination. Cross-pollination occurs when pollen is transferred from one flower to another flower on the same plant, or another plant. Cross-pollination requires pollinating agents such as water, wind, or animals, and increases genetic diversity. After the pollen lands on the stigma, the tube cell gives rise to the pollen tube, through which the generative nucleus migrates. The pollen tube gains entry through the micropyle on the ovule sac. The generative cell divides to form two sperm cells: one fuses with the egg to form the diploid zygote, and the other fuses with the polar nuclei to form the endosperm, which is triploid in nature. This is known as double fertilization. After fertilization, the zygote divides to form the embryo and the fertilized ovule forms the seed. The walls of the ovary form the fruit in which the seeds develop. The seed, when mature, will germinate under favorable conditions and give rise to the diploid sporophyte. Choices: - stem - leaf - root - flower A:
flower

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Q: The iron ion used to bind oxygen is on what type of "ring"? Read this paragraph and choose the correct option from the provided answers: The yellow subunits are identical in structure, as are the gray subunits. A smaller organic structure called a porphyrin ring is attached to each protein subunit and contains the iron ion used to bind oxygen. Choices: - DNA ring - petrarchan ring - reagent ring - porphyrin ring A:
(Answer)
porphyrin ring

Ques: Q: Any large molecule is referred to as what? Read this paragraph and choose the correct option from the provided answers: Carbon's affinity for covalent bonding means that many distinct and relatively stable organic molecules nevertheless readily form larger, more complex molecules. Any large molecule is referred to as macromolecule (macro- = "large"), and the organic compounds in this section all fit this description. However, some macromolecules are made up of several "copies" of single units called monomer (mono- = "one"; -mer = "part"). Like beads in a long necklace, these monomers link by covalent bonds to form long polymers (poly- = "many"). There are many examples of monomers and polymers among the organic compounds. Monomers form polymers by engaging in dehydration synthesis (see Figure 2.14). As was noted earlier, this reaction results in the release of a molecule of water. Each monomer contributes: One gives up a hydrogen atom and the other gives up a hydroxyl group. Polymers are split into monomers by hydrolysis (-lysis = "rupture"). The bonds between their monomers are broken, via the donation of a molecule of water, which contributes a hydrogen atom to one monomer and a hydroxyl group to the other. Choices: - cellular - microtubule - polymer - macromolecule A:
Ans: macromolecule

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Q: What occurs if oxygen cannot be obtained at a sufficient rate? Read this paragraph and choose the correct option from the provided answers: Phil Roeder. Anaerobic respiration occurs if oxygen cannot be obtained at a sufficient rate . CC-BY 2.0. Choices: - aerobic respiration - malolactic respiration - hyperventilation - anaerobic respiration A:
(A).
anaerobic respiration

Ques:Q: What is used during filtration to push fluids and solutes, from higher pressure areas to lower pressure areas? Read this paragraph and choose the correct option from the provided answers: Another mechanism besides diffusion to passively transport materials between compartments is filtration. Unlike diffusion of a substance from where it is more concentrated to less concentrated, filtration uses a hydrostatic pressure gradient that pushes the fluidand the solutes within itfrom a higher pressure area to a lower pressure area. Filtration is an extremely important process in the body. For example, the circulatory system uses filtration to move plasma and substances across the. Choices: - constructs pressure gradient - limited pressure gradient - magnesium pressure gradient - hydrostatic pressure gradient A:

Ans:hydrostatic pressure gradient

Q: What are formed when crystals precipitate out from a liquid? Read this paragraph and choose the correct option from the provided answers: Chemical sedimentary rocks form when crystals precipitate out from a liquid. The mineral halite, also called rock salt, forms this way. You can make halite! Leave a shallow dish of salt water out in the Sun. As the water evaporates, salt crystals form in the dish. There are other chemical sedimentary rocks, like gypsum ( Figure below ). Choices: - diamonds - additive sedimentary rocks - gaseous sedimentary rocks - chemical sedimentary rocks A:
chemical sedimentary rocks