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Living Creatures: Exploring their Characteristics - Life Cycle of a Plant

Grade 6CBSE

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

🔑Concepts

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A plant's life cycle describes the stages it goes through from a seed to a mature plant that produces its own seeds.

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The process starts with Germination, where a seed develops into a seedling. Germination requires three essential conditions: H2OH_2O (Water), O2O_2 (Oxygen), and optimum temperature (Warmth).

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Photosynthesis is the process by which green plants prepare their food (Glucose) using Sunlight, Chlorophyll, CO2CO_2, and H2OH_2O.

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The reproductive part of a plant is the Flower. It contains the male part (Stamen) and the female part (Pistil/Carpel).

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Pollination is the transfer of pollen grains from the anther to the stigma. This is followed by Fertilization, leading to the formation of seeds and fruits.

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Seed Dispersal is the movement of seeds away from the parent plant to avoid competition for resources. Common agents include wind, water, animals, and explosion mechanisms.

📐Formulae

6CO2+6H2O→ChlorophyllSunlightC6H12O6+6O26CO_2 + 6H_2O \xrightarrow[\text{Chlorophyll}]{\text{Sunlight}} C_6H_{12}O_6 + 6O_2

Germination Percentage=(Total seeds germinatedTotal seeds sown)×100\text{Germination Percentage} = \left( \frac{\text{Total seeds germinated}}{\text{Total seeds sown}} \right) \times 100

💡Examples

Problem 1:

A student planted 50 bean seeds in a tray. After 10 days, 42 seeds had sprouted into seedlings. Calculate the germination percentage.

Solution:

4250×100=84%\frac{42}{50} \times 100 = 84\%

Explanation:

To find the germination percentage, we divide the number of germinated seeds (42) by the total number of seeds sown (50) and multiply by 100.

Problem 2:

Calculate the total number of seeds produced by a sunflower farm if there are 250 sunflowers and each flower produces an average of 1,200 seeds. Use vertical multiplication.

Solution:

1200×250000060000240000300000\begin{array}{r} 1200 \\ \times 250 \\ \hline 0000 \\ 60000 \\ 240000 \\ \hline 300000 \end{array}

Explanation:

The total seed production is calculated by multiplying the number of plants by the seeds per plant: 250×1200=3,00,000250 \times 1200 = 3,00,000 seeds.

Problem 3:

Identify the chemical substances involved in the process of photosynthesis represented by CO2CO_2 and C6H12O6C_6H_{12}O_6.

Solution:

CO2=Carbon DioxideCO_2 = \text{Carbon Dioxide}, C6H12O6=GlucoseC_6H_{12}O_6 = \text{Glucose}

Explanation:

In the photosynthesis equation, CO2CO_2 is the gas absorbed from the atmosphere, and C6H12O6C_6H_{12}O_6 is the simple sugar (food) produced by the plant.