Structures and Germination of Seed

Seed Germination

By: Reema Singh

​Can you identify the picture given below?

Open Ended

K- What do you already know?

How much do you know about the requirements for seed germination?

Time for a video

https://youtu.be/TE6xptjgNR0

Germination of seed

​CONDITIONS REQUIRED FOR SEED GERMINATION

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What are the conditions required for seed germination?

• Water: Provides moisture and avoids dryness of the seeds. Some seeds are extremely dry and need to take a considerable amount of water.

• Air: It is an important and essential source of energy required for seed growth. 

​How do these factors affect germination?

• Temperature: For a seed to germinate, it requires a moderate temperature of around 25-30°C. Quite obviously different seeds require different optimum/favorable temperatures.

• Light: This can act as an environmental trigger. Many seeds do not germinate until sunlight falls on them.

https://www.youtube.com/watch?v=oDBX2gCXxYw

​​TIME LAPSE VIDEO ON SEED GERMINATION

Process of Germination

1. During the beginning stage of germination, the seeds take up water rapidly and this results in swelling and softening of the seed coat at an optimum temperature. It starts the growth process through the activation of enzymes.

2. Seeds wait to germinate until these needs are met: water, correct temperature (warmth), and a good location (such as in soil).

3. During its early stages of growth, the seedling relies upon the food supplies stored with it in the seed until it is large enough for its own leaves to begin making food through photosynthesis.

4. By rupturing the seed coat, a radicle emerges to form a primary root. The seed starts absorbing underground water. After the emergence of the radicle and the plumule, the shoot starts growing upwards.

5. In the final stage of seed germination, the cell of the seeds become metabolically active, elongate, and divide to give rise to the seedling.

Multiple Choice

What is seed germination?

• The process by which a plant produces a new seed.

• The process by which a seed produces a new plant.

• The process by which a seed is harvested/removed from a plant.

• The process by which a seed becomes dormant/inactive.

Multiple Choice

Which of the following is necessary for seed germination?

• soil

• space

• sunlight

• water

Multiple Choice

Which of the following statements is true about seed germination?

• Seed germination is not affected by temperature.

• Seeds always germinate within a few days of being planted.

• Seeds need oxygen to germinate.

• Seeds can only germinate in soil.

Multiple Choice

What is the first stage of seed germination?

• The seed absorbs water

• The seed sends out a root

• The seed grows leaves

• The seed becomes dormant/inactive.