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Our School—A Happy Place - Greenery Around Us: Plants and Trees

Grade 5CBSE

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

🔑Concepts

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Plants are known as the primary producers of the ecosystem because they prepare their own food through a process called photosynthesis.

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Classification of plants based on growth habits: Herbs (green, tender stems), Shrubs (woody stems, branched near the base), Trees (thick, hard trunk), Climbers (need support to climb), and Creepers (spread on the ground).

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Photosynthesis is the chemical process where plants use Carbon Dioxide (CO2CO_2), Water (H2OH_2O), and Sunlight in the presence of Chlorophyll to produce Glucose (C6H12O6C_6H_{12}O_6) and Oxygen (O2O_2).

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The root system consists of two main types: Taproots (one thick main root with lateral branches) and Fibrous roots (a cluster of thin, similar-sized roots).

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Stomata are tiny pores found mostly on the underside of leaves that facilitate the exchange of gases like O2O_2 and CO2CO_2 and the process of transpiration.

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Germination is the process by which a seed develops into a seedling. The necessary conditions for germination are AirAir, WaterWater, and WarmthWarmth (suitable temperature).

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Chlorophyll is the green pigment in leaves that absorbs solar energy, which is essential for making food.

📐Formulae

6CO2+6H2O→Sunlight, ChlorophyllC6H12O6+6O26CO_2 + 6H_2O \xrightarrow{\text{Sunlight, Chlorophyll}} C_6H_{12}O_6 + 6O_2

Starch+Iodine→Blue-black color (indicates presence of food)\text{Starch} + \text{Iodine} \rightarrow \text{Blue-black color (indicates presence of food)}

💡Examples

Problem 1:

Identify the process and the gas released when a plant is kept in sunlight. Also, calculate the total number of trees if a school garden has 12 rows with 15 trees in each row.

Solution:

The process is Photosynthesis, and the gas released is Oxygen (O2O_2). Total trees = 12×15=18012 \times 15 = 180.

Explanation:

Plants perform photosynthesis in sunlight to produce food and release O2O_2 as a byproduct. To find the total number of trees, we multiply the number of rows by the number of trees per row.

Problem 2:

A student observed that a plant's stem was growing towards the window. What is this phenomenon called?

Solution:

PhototropismPhototropism

Explanation:

Plants exhibit movements in response to light. The growth of a plant part (usually the stem) towards a light source is called phototropism.

Problem 3:

If a school decides to plant trees around a rectangular playground of length l=50 ml = 50\text{ m} and breadth b=30 mb = 30\text{ m} at intervals of 5 m5\text{ m}, how many trees are needed for the perimeter?

Solution:

Perimeter P=2×(50+30)=160 mP = 2 \times (50 + 30) = 160\text{ m}. Total trees = 1605=32\frac{160}{5} = 32.

Explanation:

First, calculate the perimeter of the playground using the formula 2×(l+b)2 \times (l + b). Then, divide the total perimeter by the distance between each tree to find the number of trees.