Biology Photosynthesis and Respiration

The diagram below represents a cross section of a leaf of a green plant, showing an opening (stomate) in the lower surface. A stomate in the lower surface of the leaf has a function most similar to the function of which cell structure?

Cell membrane

The diagram below represents a cell of a green plant. Solar energy is used to produce energy-rich compounds in structure

D - the little ovals

Five tanks were set up, each with euglena and a different concentration of nitrate solution: 0%, 0.5%, 1.0%, 1.5%, and 2.0%. The tanks were placed in a sunny location where each tank received the same amount of light. Which statement is a possible hypothesis for this experiment that could be supported by the results of this experiment?

If the nitrate concentration is increased, then the euglena will have a lower average number of chloroplasts.

Which phrase, if placed in box X, would correctly complete the flowchart shown below?

Increased concentration of glucose in leaf cells

Certain organisms are able to store energy from the Sun in energy-rich compounds. Which event best illustrates this activity?

Lettuce produces organic substances.

A student placed a test tube containing elodea (an aquatic plant) and pond water 10 cm from a light source. He observed that the plant gave off bubbles of a gas and counted how many bubbles were released in one minute. He moved the plant farther away from the light source to see if distance from the source made a difference. The data table below shows his results. The gas that was being produced was most likely

Oxygen as a product of the process of photosynthesis

A technique used to analyze pigments in spinach leaves is shown in the diagram below. This technique is known as

Paper chromatography

Which process uses energy to combine inorganic molecules to synthesize organic molecules?

Photosynthesis

While looking at the bottom surface of a leaf with a compound light microscope, a student notices pairs of cells with openings between them on the surface of the leaf. The main purpose of these openings and the cells that surround them is

Regulating Gas Exchange

A biological process that occurs in plants is represented below. Which row in the chart below identifies the lettered substances in this process?

Row 2

Which technique could be used to make the structures in the cells more visible when using a compound light microscope?

Staining

Which statement is a valid inference concerning structure X represented in the diagram below?

Structure X transports materials for metabolic activities.

The cells of some organisms contain both chloroplasts and mitochondria. Which statement describes what would happen in these cells if they were moved from a light environment to a dark one?

The amount of oxygen present would decrease and the amount of carbon dioxide would increase.

Plants that live in hot, dry climates have evolved mechanisms to help conserve limited water supplies. One example is the closing of leaf openings by guard cells during the day to decrease water loss from their leaves. This detection of and response to an environmental stimulus is an example of

a feedback mechanism

Which phrase is an example of autotrophic nutrition?

an apple tree making its own food

More energy can be released from a fat molecule than from a glucose molecule because the fat molecule contains more

chemical bonds

Plants are able to continue to grow and develop once the starch supply in the seed is gone, because they

have chloroplasts and use light energy to make more food

Euglena are unique single-celled organisms. Depending on the physical conditions present in their aquatic environment, Euglena can act as either producers or consumers. Euglena will most likely act as consumers when placed in an environment that has

little or no light present

Which process is most closely associated with the regulation of water loss from the leaves of trees?

movement of water through leaf openings controlled by the guard cells

Which process initially provides the link between an abiotic factor and the energy needs of an entire ecosystem?

photosynthesis

The arrows in the diagram below represent the movement of materials. This movement of materials indicated by the arrows is most directly involved in the processes of

photosynthesis and excretion

Photosynthesis and respiration are alike in that they both

require specific catalysts

Which two processes are responsible for keeping the percentage of atmospheric oxygen at relatively constant levels?

respiration and photosynthesis

Plants are green because they contain the protein chlorophyll. A bucket was left on the lawn for one week. When the bucket was removed, the grass under the bucket had turned from green to a yellowish white color. This change is due to the interaction between the grass and

the amount of sunlight, an abiotic factor

Scientists have found that although plants require light to carry on photosynthesis, very high levels of sunlight can kill some plants. This illustrates that many biochemical processes may occur

within a specific range of conditions