Question

Seeds placed deep inside the soil do not germinate because they are
A) Unable to get sufficient oxygen
B) Without sufficient food to bring a seedling to the surface
C) Under the pressure of overlying soil layers
D) Unable to get light

Answer 1

Hint: When an embryo forms in a seedling, this process is called germination. Germination depends on various internal and external factors like water, light, oxygen, food, longevity, dormancy, etc.

Complete Answer:
- When a seed is planted in the soil, germination occurs. Germination is a phase in which the seed transitions from a dormant state to a developing, living plant. The seed contains a small plant embryo as well as all the nutrients that the developing plant requires to begin its growth cycle.

- Water is one of the most significant factors in the germination of seed. Water is necessary for cellular respiration which is a metabolic process.

- Oxygen is also essential for cellular respiration, so it must be present to allow the seed to begin to develop under the soil. That's why it's important not to plant seeds too deep. If they can't get enough oxygen underground, they will not be able to expand. So, the air is essential for the germination of the seed. Seeds planted deep in the soil do not germinate because they are unable to get enough oxygen.

- When the seedling develops, it breaks out of the soil. After this stage, germination is complete, and the seedling can begin photosynthesis to gain energy. This will cause the developing seedling to straighten up into a tiny plant, heading for the sun.

So, the correct option is A, Unable to get sufficient oxygen.

Note: Rapid cell division takes place during germination. Energy is needed for the division of cells. This energy is created by oxidation. The oxygen that is needed for oxidation is supplied by air.