Question

u1l9-13 lions assess. #2 study guide unit 1 africa - assessment #1 individual (paper) review for midpoint assessment on tues 09.09.25 lesson & movie: energy in organisms? (chart: columns - blank, organism a, organism b; rows - amount ingested, amount needed to maintain, amount egested, whats missing? organism a: amount ingested 10.7, amount needed to maintain 63.0, amount egested 30.4; organism b: amount ingested 24.3, amount needed to maintain 84.0, amount egested 42.1; whats missing? blank) 1. what is \missing\ from each organism? what does the \missing\ energy get used for in the organism? 2. if organism b eats organism a, what energy is directly available to organism b from organism a? 3. provide evidence to back up your claim in question #2 (use what we learned in lesson 8 to help you!)

Explanation:

Question 1: What is "missing" from each organism? What does the "missing" energy get used for in the organism?

The "missing" energy in each organism is the energy used for life processes like growth, movement, reproduction, and maintaining homeostasis (like respiration, digestion, cell repair). For Organism A: Let's calculate the total input (assuming "Amount Ingested" + "Amount Needed to Maintain" or using the given numbers. Wait, looking at the table: Organism A has Amount Ingested = 10.7? Wait, no, maybe the columns are: Amount Ingested, Amount Needed to Maintain, Amount Egested, What’s “missing”? Wait, the table for Organism A: first column (maybe Amount Ingested) 10.7? No, maybe the columns are: Organism A: 10.7 (maybe Amount Ingested), 63.0 (Amount Needed to Maintain?), 30.4 (Amount Egested). Wait, no, the energy flow: Ingested energy = energy used for maintenance + energy for growth/reproduction + egested energy. Wait, maybe the "missing" is the energy used for cellular respiration (metabolic processes) and growth. Wait, actually, in a food chain, when an organism eats another, the energy not egested (excreted) or used for maintenance is used for growth (which is available to the next trophic level). But the "missing" energy here is likely the energy used in metabolic processes (like respiration) and for the organism's life functions (movement, growth, repair, reproduction). For example, for Organism A: If we sum the "Amount Needed to Maintain" (63.0) and "Amount Egested" (30.4), that's 93.4, but "Amount Ingested" is 10.7? Wait, maybe the numbers are misread. Wait, Organism B: Amount Ingested 24.3, Amount Needed to Maintain 84.0? No, that can't be, because ingested can't be less than maintenance. Wait, maybe the columns are reversed. Maybe "Amount Ingested" is higher. Wait, maybe the table is:

	Organism A	Organism B
Amount Needed to Maintain	10.7	24.3
Amount Egested	30.4	42.1
What’s “missing”?	?	?

Ah, that makes sense. So Ingested energy = energy for maintenance + energy for growth (missing) + egested energy. So for Organism A: Missing energy = Ingested - Maintenance - Egested = 63.0 - 10.7 - 30.4 = 21.9. For Organism B: 84.0 - 24.3 - 42.1 = 17.6. The "missing" energy is used for the organism's growth, reproduction, movement, cellular respiration (to produce ATP for life processes), and repair of cells.

When one organism eats another, the energy available to the consumer (Organism B) is the energy stored in the biomass of the prey (Organism A) that is not egested (excreted) or used by Organism A for its own maintenance. From Question 1, the "missing" energy in Organism A is the energy used for growth (which becomes its biomass). So the energy available to Organism B is the growth energy (missing energy) of Organism A, because that's the energy stored in its body that can be transferred. From Question 1, Organism A's missing energy (growth energy) is 21.9 (from the corrected calculation). Alternatively, the energy available is the ingested energy of Organism A minus what it used for maintenance and egested, which is the growth energy (since that's the biomass available to the next trophic level).

In ecological energy flow (Lesson 8 likely covers trophic levels, energy transfer, and the 10% rule or energy allocation in organisms), when an organism (prey, Organism A) is consumed by another (predator, Organism B), only the energy stored in the prey’s biomass (from growth) is available to the predator. The prey uses energy for: 1) Maintenance (respiration, keeping alive), 2) Egestion (waste, undigested food), and 3) Growth (biomass increase). The growth energy is the only part that becomes part of the prey’s body and can be eaten by the predator. From the table, Organism A’s ingested energy (63.0) is allocated to maintenance (10.7), egestion (30.4), and growth (21.9). When Organism B eats Organism A, it can only access the energy in Organism A’s body (the growth energy), as the maintenance energy was already used (converted to heat/ATP for life processes) and egested energy is waste. This follows the principle that energy transfer between trophic levels is inefficient, with only the biomass (growth energy) of the lower trophic level being available to the higher one.

Answer:

The "missing" energy is the energy used for the organism’s life processes (growth, reproduction, movement, cellular respiration, cell repair, etc.). For Organism A: Missing energy = \( 63.0 - 10.7 - 30.4 = 21.9 \) (units of energy). For Organism B: Missing energy = \( 84.0 - 24.3 - 42.1 = 17.6 \) (units of energy). This energy is used for growth, reproduction, metabolic activities (like respiration), movement, and maintaining cellular functions.

Question 2: If Organism B eats Organism A, what energy is directly available to Organism B from Organism A?