Question

Which process in photosynthesis uses energy from the sun?(1 point)
Responses

splitting water into hydrogen and oxygen
splitting water into hydrogen and oxygen

combining carbon dioxide and hydrogen
combining carbon dioxide and hydrogen

absorbing carbon dioxide
absorbing carbon dioxide

releasing oxygen

Pls answer with letters

Answer 1

A scientist fills a glass container with water and places an aquatic plant inside the container, then closes the lid and places the container in direct sunlight. The scientist observes small bubbles on the surfaces of the plant’s leaves on days 1 and 2, but no bubbles on day 3. The scientist concludes that the bubbles were caused by photosynthesis. Which substance should be added to the water in order for the bubbles to reappear?(1 point)
Responses

carbon dioxide
carbon dioxide

oxygen
oxygen

hydrogen gas
hydrogen gas

glucose

Answer 2

ATP is(1 point)
Responses

released when carbon dioxide and water form glucose
released when carbon dioxide and water form glucose

a form of energy that can be used and stored
a form of energy that can be used and stored

a form of energy that cannot be stored
a form of energy that cannot be stored

stored during cellular respiration

Answer 3

ATP stores some of the energy from glucose molecules during cellular respiration. How is the remaining energy from these glucose molecules released?(1 point)
Responses

Excess heat
Excess heat

Excess carbon dioxide
Excess carbon dioxide

Excess light
Excess light

Excess water

Answer 4

Scientists exposed plants to radioactive oxygen in different forms to observe how plants recycle oxygen during photosynthesis. Which conclusion would their observations support?  (1 point)
Responses

Oxygen gas and water are recycled into glucose and carbon dioxide.
Oxygen gas and water are recycled into glucose and carbon dioxide.

Glucose and oxygen gas are recycled into carbon dioxide and water.
Glucose and oxygen gas are recycled into carbon dioxide and water.

Glucose and water are recycled into carbon dioxide and oxygen gas.
Glucose and water are recycled into carbon dioxide and oxygen gas.

Carbon dioxide and water are recycled into glucose and oxygen gas.

Answer 5

A river food chain works as follows:

Algae → insects → salmon → bears

The producers in the ecosystem produce 8,000,000 kilocalories of energy via photosynthesis. The bears need 100 kilocalories to survive. Can the ecosystem support the bears, and if so, how many individuals?

(1 point)
Responses

no, 0 individuals
no, 0 individuals

no, 0.8 individuals
no, 0.8 individuals

yes, 80 individuals
yes, 80 individuals

yes, 800 individuals

Answer 6

The correct response is:

**A** - splitting water into hydrogen and oxygen

Answer 7

The correct response is:

**A** - carbon dioxide

Answer 8

The correct response is:

**B** - a form of energy that can be used and stored.

Answer 9

The correct response is:

**A** - Excess heat.

Answer 10

The correct response is:

**D** - Carbon dioxide and water are recycled into glucose and oxygen gas.

Answer 11

To determine whether the ecosystem can support the bears and how many individuals, we need to calculate how many kilocalories are transferred through the food chain.

In general, only about 10% of the energy at one trophic level is transferred to the next level. Here's how the energy is transferred in this food chain:

1. Algae (producers) = 8,000,000 kilocalories
2. Insects (primary consumers) = 10% of 8,000,000 = 800,000 kilocalories
3. Salmon (secondary consumers) = 10% of 800,000 = 80,000 kilocalories
4. Bears (tertiary consumers) = 10% of 80,000 = 8,000 kilocalories

Now we can find out how many bears can be supported with the 8,000 kilocalories available:

Total kilocalories available for bears = 8,000 kilocalories

Energy needed per bear = 100 kilocalories

Number of bears supported = 8,000 kilocalories / 100 kilocalories per bear = 80 bears

Therefore, the ecosystem can support the bears, and the correct response is:

**C** - yes, 80 individuals.