Question

1. Which of these is a useful Chemical reaction? 

a) Food rancidity

b) Photosynthesis

c) Rusting

d) None

2. Which of the following statements is True?

a) Respiration is chemically the opposite of photosynthesis

b) Rusting is a rapid process

c) Complete combustion requires short supply of oxygen

d) Photosynthesis requires oxygen

Help me please, no guess work.
THANKS!.​

Answer 1

1. b
2. a

Answer:

photosynthesis is a usefull chemical reaction cause this process produces food

Cell respiration and photosynthesis are essentially opposite processes. Photosynthesis is the process by which organisms make high-energy compounds – the sugar glucose in particular – through the chemical "reduction" of carbon dioxide (CO2). ... Cellular respiration consumes oxygen and produces CO2.

Answer 2

1. b

2.a

Step-by-step explanation:

Photosynthesis is a useful reaction because it provides plants with food.... Rusting has disadvantages

Rusting is a slow process... complete combustion requires a lot of oxygen... photosynthesis requires carbon(IV) oxide and not oxygen