SRS 4 - Flow of Energy and Life Processes in Ecosystems

Which of the following are the products of light-dependent reactions?

• ADP, NADP, and O₂

• C₆H₁₂O₆ and O₂

• ATP, NADPH, and O₂

• H₂O, CO₂, and C₆H₁₂O₆

Tags

NGSS.HS-LS1-5

Which of the following occurs during light-independent reactions?

• Synthesis of glucose molecules

• Harnessing light energy

• Formation of ATP and NADPH molecules

• Lysis of water molecules into H⁺ and O₂

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-6

Pyruvate, the end product of glycolysis, must be converted first before it enters the Krebs cycle. What molecule will it become that will then enter the Krebs cycle?

• Pyruvate

• Acetyl-CoA

• CO₂

• NADH

Tags

NGSS.HS-LS1-7

Match the following terms/ figure to the process they belong to.

Groups:

(a) Photosynthesis

,

(b) Cellular Respiration

• Calvin Cycle

• Glycolysis

• Light Dependent Reactions

• Electron Transport Chain

• 
• 

Tags

NGSS.HS-LS1-5

NGSS.HS-LS1-7

NGSS.HS-LS2-5

Photosynthesis can be compared to cooking using a stove. The fire provides energy for the process, generating steam as a byproduct. The energy is then used to create the final product. Analyze the analogical model of photosynthesis and label the reactants and products.

a

b

c

d

Glucose

Water

Carbon Dioxide

Oxygen

Nitrogen

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Where in the electron transport chain is the high concentration of protons (H⁺) established, which then drives the activation of ATP synthase?

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

Reorder the following steps of the light-dependent reactions in the correct sequence.

• Light is absorbed by pigments in PSII, exciting an electron in the reaction center (P680). The excited electron is transferred to an acceptor molecule, and the lost electron is replaced by splitting water, releasing O₂.

• The electron arrives at PSI, where it is re-energized by light absorbed by the P700 reaction center. This high-energy electron is then transferred to an acceptor molecule.

• The re-energized electron travels down a short electron transport chain, where it combines with NADP⁺ to form NADPH, completing the light-dependent reactions.

• The excited electron travels down the electron transport chain, releasing energy. This energy pumps H⁺ ions into the thylakoid interior, creating a proton gradient.

• H⁺ ions flow back into the stroma through ATP synthase, using the proton gradient to drive ATP production via chemiosmosis.

Tags

NGSS.HS-LS1-5

Organize the following products into the correct biological processes.

Groups:

(a) Products of Glycolysis

,

(b) Products of Krebs Cycle

,

(c) Products of Electron Transport Chain

• NADH (1st)

• CO2

• NADH (2nd)

• H2O

• FADH2

• Pyruvate

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-3

Cellular respiration can occur in two main forms: aerobic respiration and anaerobic respiration. Aerobic respiration occurs in the presence of oxygen and takes place mainly in the ​ (a)   of the cell. This process involves multiple stages, including glycolysis, the Krebs cycle, and the electron transfer chain, ultimately producing ​ (b)   (a large number of molecules) as well as carbon dioxide and ​ (c)   as byproducts. In contrast, anaerobic respiration occurs when oxygen is absent. This process primarily takes place in the ​ (d)   of the cell and leads to the production of ​ (e)   and a much smaller amount of ATP (only 2 molecules).

• mitochondria
• ATP
• lactate
• cytoplasm
• water
• oxygen

Tags

NGSS.HS-LS1-7

NGSS.HS-LS2-5

Reflect on the question below and answer in 3 sentences.

What kind of pictures, diagrams or concept maps do you draw to help you understand your learning? How does it help you learn in science?

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NGSS.HS-ESS2-3

NGSS.HS-LS1-2

NGSS.HS-PS3-2