Question

Which are the external conditions required for seed germination?
A. Oxygen, carbon dioxide, and suitable temperature
B. Oxygen, light, and suitable temperature
C. Light, moisture, and suitable temperature
D. Oxygen, moisture, and suitable temperature

Answer 1

Hint: Every organism arises from seed in this nature, whether it be a plant or an organism. The conditions in which a seed develops matters a lot. It will need a particular environment to grow, this will vary for each organism. The excess of everything is harmful so the optimum conditions are important.

Complete answer:
- Seed germination is a process that occurs naturally when rootlets and shoots start to arise from the seed when provided the optimum conditions.
- Water is necessary for them as the food in the seed in the dried form. They cannot utilize it as such, it needs to be converted into liquid form. For this, water is required.
- The oxygen is required for the oxidation of the energy which is required for the cell division in the seed.
- The low temperature will slow down the germination process. High temperatures will destroy the embryo tissue. So the optimum temperature matters.

> Option A: Oxygen, carbon dioxide, and suitable temperature: oxygen and temperature are a must. Carbon dioxide is not an important requirement.

> Option B: Oxygen, light, and suitable temperature: oxygen and temperature are important. The light is not initially required as the seed germinates in the dormant and dark state in the soil.

> Option C: Light, moisture, and suitable temperature: light is not an important requirement.

> Option D: Oxygen, moisture, and suitable temperature: the oxygen, moisture that is water, and temperature are the most critical requirements.

Hence, the correct answer is option (D).

Note: The main root is the first structure to grow from seed. They need a damp, dark, and warm environment. Planting the seeds at the wrong time will also affect their growth. Germinating a 20-year-old seed can also produce a healthy plant.