DENDROLOGY

Previous
Next

TREE PHYSIOLOGY

PHOTOSYNTHESIS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Scientists detect a distant planet very similar to Earth. It orbits a single star and has one moon. They have also detected oxygen in the planet’s atmosphere. The scientists think the oxygen in the atmosphere came from the same reaction as the oxygen in Earth’s atmosphere. What do the scientists think provided the energy for this reaction?
A
light from the star
B
heat from the planet’s core
C
magnetic field around the planet
D
gravitational pull from the planet’s moon
Explanation: 

Detailed explanation-1: -The vast majority of planets around other stars have been found through the transit method so far. This technique involves monitoring the amount of light that a star gives off over time, and looking for dips in brightness that may indicate an orbiting planet passing in front of the star.

Detailed explanation-2: -NASA’s Curiosity rover has found rocks on Mars that suggest the planet’s atmosphere may once have been more oxygen-rich than now. High levels of manganese oxides, combined with the mounting evidence of the abundance of ancient lakes, paint a picture of a very Earth-like planet.

Detailed explanation-3: -Problem 3 – Which planet has the atmosphere with the greatest percentage of Oxygen? Answer: From the table we see that Mercury has the greatest percentage of oxygen in its atmosphere.

Detailed explanation-4: -It’s a technique known as “transit spectroscopy, ‘’ when light from a star travels through the atmosphere of an orbiting planet and reaches our telescopes – in space or on the ground – and tells about where it’s been.

There is 1 question to complete.
Previous
Next