*Question*
Q: What is the second stage of photosynthesis? Read this paragraph and choose the correct option from the provided answers: The second stage of photosynthesis is the production of glucose from carbon dioxide. This process occurs in a continuous cycle, named after its discover, Melvin Calvin. The Calvin cycle uses CO 2 and the energy temporarily stored in ATP and NADPH to make the sugar glucose. Choices: - pigment release - production of protein - glucose destruction - production of glucose A:
**Answer**
production of glucose

*Question*
Q: What part of the plant is the main site of photosynthesis? Read this paragraph and choose the correct option from the provided answers: 30.4 Leaves Leaves are the main site of photosynthesis. A typical leaf consists of a lamina (the broad part of the leaf, also called the blade) and a petiole (the stalk that attaches the leaf to a stem). The arrangement of leaves on a stem, known as phyllotaxy, enables maximum exposure to sunlight. Each plant species has a characteristic leaf arrangement and form. The pattern of leaf arrangement may be alternate, opposite, or spiral, while leaf form may be simple or compound. Leaf tissue consists of the epidermis, which forms the outermost cell layer, and mesophyll and vascular tissue, which make up the inner portion of the leaf. In some plant species, leaf form is modified to form structures such as tendrils, spines, bud scales, and needles. Choices: - soil - root - stem - leaf A:
**Answer**
leaf

*Question*
Q: Most vascular plants are seed plants, also known as? Read this paragraph and choose the correct option from the provided answers: Most vascular plants are seed plants, or spermatophytes. They reproduce with seeds and pollen. Some modern seed plants are gymnosperms that produce seeds in cones. Choices: - sporozoans - bacteria - fungus - spermatophytes A:
**Answer**
spermatophytes

*Question*
Q: The three greatest proximate threats to biodiversity are habitat loss, overharvesting, and introduction of what? Read this paragraph and choose the correct option from the provided answers: 21.2 | Threats to Biodiversity By the end of this section, you will be able to: Identify significant threats to biodiversity Explain the effects of habitat loss, exotic species, and hunting on biodiversity Identify the early and predicted effects of climate change on biodiversity The core threat to biodiversity on the planet, and therefore a threat to human welfare, is the combination of human population growth and the resources used by that population. The human population requires resources to survive and grow, and those resources are being removed unsustainably from the environment. The three greatest proximate threats to biodiversity are habitat loss, overharvesting, and introduction of exotic species. The first two of these are a direct result of human population growth and resource use. The third results from increased mobility and trade. A fourth major cause of extinction, anthropogenic (human-caused) climate change, has not yet had a large impact, but it is predicted to become significant during this century. Global climate change is also a consequence of human population needs for energy and the use of fossil fuels to meet those needs (Figure 21.7). Environmental issues, such as toxic pollution, have specific targeted effects on species, but are not generally seen as threats at the magnitude of the others. Choices: - solar radiation - carbon dioxide - carbon monoxide - exotic species A:
**Answer**
exotic species