Question

spanish test here multiple choice questions answer on your answer sheet

1. which of the following best describes the biosphere?

a) all living organisms and ecosystems on earth
b) all land on earth
c) all water bodies on earth
d) the layer of gases surrounding earth

1. which of these biogeochemical cycles involves the process of nitrogen fixation?

a) carbon cycle
b) nitrogen cycle
c) water cycle
d) oxygen cycle

1. which of the following is an example of an autotroph?

a) fungi
b) bacteria
c) human
d) plant

1. what is the primary function of stomata?

a) to absorb sunlight
b) to allow water absorption
c) to exchange gases ($\text{co}_2$ and $\text{o}_2$)
d) to prevent water loss

1. where are stomata mostly located on plant leaves?

a) on the top of the leaf
b) on the underside of the leaf
c) on the stem
d) in the roots

1. where do land plants primarily get the nitrogen they need for growth?

a) soil
b) water
c) air
d) sunlight

Explanation:

1. The biosphere encompasses all living things and their ecosystems on Earth.
2. Nitrogen fixation is the key process that defines the nitrogen cycle.
3. Autotrophs produce their own food; plants do this via photosynthesis.
4. Stomata primarily open and close to facilitate the exchange of carbon dioxide and oxygen for photosynthesis and respiration.
5. Most plant leaves have stomata concentrated on their underside to reduce water loss from direct sunlight.
6. Land plants absorb nitrogen in usable forms from the soil, as they cannot directly use atmospheric nitrogen.

Answer:

1. a) All living organisms and ecosystems on Earth
2. b) Nitrogen cycle
3. d) Plant
4. c) To exchange gases (CO₂ and O₂)
5. b) On the underside of the leaf
6. a) Soil