Le Hw4.1.13

The graph below shows photosynthetic activity in an ecosystem over a 24-hour period. Data for a study on respiration in this ecosystem should be collected during

• Interval A, from only the producers in the ecosystem

• Intervals A and B, from only the consumers in the ecosystem

• Intervals A and B, from both the producers and consumers in the ecosystem

• Interval A only, from abiotic but not biotic components of the ecosystem

Maple trees and tulips are classified as autotrophs because they both

• Produce gametes by the process of mitosis

• Produce carbon dioxide and water as metabolic wastes

• Are able to obtain complex organic materials from the environment

• Are able to synthesize organic molecules from inorganic raw materials

The diagram below represents a plant cell. Which process takes place in structure A?

• Cellular respiration

• Heterotrophic nutrition

• Digestion of fats

• Protein synthesis

The diagram below represents a process that occurs in a structure of a specialized cell. Which group below correctly identifies the letters in the diagram?

• A: ribososme B: oxygen C: carbon dioxide D: water

• A: mitochondrion B: water C: oxygen D: protein

• A: nucleus B: nitrogen C: carbon D: starch

• A: chloroplast B: carbon dioxide C: water D: glucose

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

• Vacuole

• Ribosome

• Nucleus

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

• A: enzymes B: oxygen C: carbon dioxide D: glucose

• A: carbon dioxide B: glucose C: oxygen D: enzymes

• A: glucose B: enzymes C: oxygen D: carbon dioxide

• A: oxygen B: glucose C: carbon dioxide D: enzymes

The diagram below represents an autotrophic cell. For the process of autotrophic nutrition, the arrow labeled A would most likely represent the direction of movement of

• Carbon dioxide, water, and solar energy

• Oxygen, glucose, and solar energy

• Carbon dioxide, oxygen, and heat energy

• Glucose, water, and heat energy

Base your answer on the information below and on your knowledge of biology. The Control of Transpiration Plants normally lose water from openings (stomates) in their leaves. The water loss typically occurs during daylight hours when plants are exposed to the Sun. This water loss, known as transpiration, is both beneficial and harmful to plants. Scientists believe wind and high temperatures increase the rate of transpiration, but the size of each stomate opening can be regulated. Reducing the size of the openings during drought conditions may help reduce the dehydration and wilting that would otherwise occur. A leaf may lose more than its own weight in water each day. Transpiration also lowers the internal temperature of the leaf as water evaporates. On hot days, temperatures in the leaves may be from 3° to 15°C cooler than the outside air. With stomates open, vital gases may be exchanged between the leaf tissues and the outside environment. Researchers have also found many plants that use another response when leaf temperatures rise. Special molecules known as heat shock proteins are produced by plant cells and help to hold enzymes in their functional shapes. Identify one of the “vital gases” that are exchanged between leaf tissues and the outside environment. [1]

Base your answer on the information below and on your knowledge of biology. The Control of Transpiration Plants normally lose water from openings (stomates) in their leaves. The water loss typically occurs during daylight hours when plants are exposed to the Sun. This water loss, known as transpiration, is both beneficial and harmful to plants. Scientists believe wind and high temperatures increase the rate of transpiration, but the size of each stomate opening can be regulated. Reducing the size of the openings during drought conditions may help reduce the dehydration and wilting that would otherwise occur. A leaf may lose more than its own weight in water each day. Transpiration also lowers the internal temperature of the leaf as water evaporates. On hot days, temperatures in the leaves may be from 3° to 15°C cooler than the outside air. With stomates open, vital gases may be exchanged between the leaf tissues and the outside environment. Researchers have also found many plants that use another response when leaf temperatures rise. Special molecules known as heat shock proteins are produced by plant cells and help to hold enzymes in their functional shapes. Identify the specific leaf structures that regulate the opening and closing of stomates. [1]

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