Question

1. according to the law of conservation of energy, when energy appears to be “lost,” it actually:

a) becomes mass
b) transforms into a less useful form like heat
c) disappears completely
d) turns into potential energy permanently

1. which statement correctly connects photosynthesis and respiration?

a) photosynthesis stores energy; respiration releases it.
b) respiration stores sunlight energy; photosynthesis releases atp.
c) both create energy from nothing.
d) both occur only in plant cells.

Explanation:

Question 9

The Law of Conservation of Energy states that energy cannot be created or destroyed, only transformed. When energy seems "lost", it is often transformed into less useful forms like heat (thermal energy). Option a is incorrect as mass - energy equivalence (E = mc²) is a different concept (from relativity) and not directly related to the common "lost" energy in most energy transformation scenarios. Option c violates the conservation law. Option d is wrong because energy transformation is not permanent in that sense and potential energy can be further transformed.

Photosynthesis uses light energy to convert carbon dioxide and water into glucose (stores chemical energy). Respiration breaks down glucose (or other organic molecules) to release energy (in the form of ATP). Option b is incorrect because respiration does not store sunlight energy (photosynthesis does) and photosynthesis produces glucose (which can be used to make ATP later, but not directly releasing ATP in the sense described). Option c violates the law of conservation of energy (energy cannot be created from nothing). Option d is wrong because respiration occurs in both plant and animal cells (plants also respire, not just photosynthesize).

Answer:

B. Transforms into a less useful form like heat

Question 10