Question

homework

1. which of the follow molecules are reactants of photosynthesis?

(a) o₂ + co₂
(b) glucose + h₂o
(c) co₂ + h₂o
(d) glucose + o₂

1. **a new plant is discovered in the amazon rainforest. its leaves are bright orange. which of the following colors is least absorbed/reflected from the plant?

(a) green
(b) blue
(c) red
(d) orange

1. **explain your answer choice to question 2.

Explanation:

Question 1

Step1: Recall photosynthesis reactants

Photosynthesis reactants are \( \text{CO}_2 \) and \( \text{H}_2\text{O} \), products are glucose and \( \text{O}_2 \).

Step2: Analyze options

• (A): \( \text{O}_2 + \text{CO}_2 \) – \( \text{O}_2 \) is a product, wrong.
• (B): Glucose \( + \text{H}_2\text{O} \) – Glucose is a product, wrong.
• (C): \( \text{CO}_2 + \text{H}_2\text{O} \) – Correct reactants.
• (D): Glucose \( + \text{O}_2 \) – Both are products (respiration reactants), wrong.

Step1: Recall pigment absorption

Plant pigments (like chlorophyll) absorb light for photosynthesis. The color we see is reflected (not absorbed).

Step2: Analyze the plant’s color

The plant is bright orange, so it reflects orange light. Thus, orange light is least absorbed (since it’s reflected).

Plants appear a color because they reflect that color (and absorb other colors for photosynthesis). A bright orange plant reflects orange light, so orange light is the least absorbed (as it is reflected instead of being used for energy capture).

Answer:

C. \( \text{CO}_2 + \text{H}_2\text{O} \)

Question 2