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Living Creatures: Exploring their Characteristics - Essential Conditions for Germination

Grade 6CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

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Germination is the process by which a seed grows into a young plant or a seedling.

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Water (H2OH_2O) is a primary requirement; it softens the seed coat, making it burst, and activates enzymes that convert stored food into a usable form.

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Air (specifically Oxygen or O2O_2) is essential for the process of respiration, which provides the energy required for the growth of the embryo.

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Warmth (Optimum Temperature) is necessary because the chemical reactions inside the seed occur most efficiently at temperatures between 25∘C25^{\circ}C and 35∘C35^{\circ}C.

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The seed consists of an embryo, which has two main parts: the Radicle (which grows into the root) and the Plumule (which grows into the shoot).

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Cotyledons are the 'seed leaves' that store food for the developing embryo until it can perform photosynthesis.

📐Formulae

Germination Condition=Moisture+Oxygen+Warmth\text{Germination Condition} = \text{Moisture} + \text{Oxygen} + \text{Warmth}

Germination Percentage=Total Seeds GerminatedTotal Seeds Sown×100\text{Germination Percentage} = \frac{\text{Total Seeds Germinated}}{\text{Total Seeds Sown}} \times 100

Respiration during Germination: Glucose+O2→Energy+CO2+H2O\text{Respiration during Germination: } \text{Glucose} + O_2 \rightarrow \text{Energy} + CO_2 + H_2O

💡Examples

Problem 1:

A farmer sowed 250250 seeds in a field. After a week, he observed that 215215 seeds had successfully developed into seedlings. Calculate the germination percentage of the seeds.

Solution:

Germination Percentage=215250×100=86%\text{Germination Percentage} = \frac{215}{250} \times 100 = 86\%

Explanation:

Using the formula for germination percentage, we divide the successful seedlings (215215) by the total seeds (250250) and multiply by 100100 to get the efficiency of the seed batch.

Problem 2:

In an experiment, three beakers were set up: Beaker A (Seeds + Dry Cotton), Beaker B (Seeds + Wet Cotton + Fridge at 0∘C0^{\circ}C), and Beaker C (Seeds + Wet Cotton + Room Temperature at 30∘C30^{\circ}C). In which beaker will germination occur?

Solution:

Germination will occur only in Beaker C.

Explanation:

Beaker A lacks Water (H2OH_2O). Beaker B lacks the required Warmth (Temperature ≈0∘C\approx 0^{\circ}C is too low). Beaker C provides all three essential conditions: Water, Air, and optimum Warmth (30∘C30^{\circ}C).