The World of the Living (VI–VIII) • Topic 1 of 5

Plants: Structure & Functions

Start with the parts and their jobs, because CTET asks this as a match-the-function item almost every cycle. Roots anchor the plant and absorb water and minerals from the soil (a taproot, as in mustard or mango, has one main root; a fibrous root, as in grass or wheat, has many thin ones). The stem holds up the plant and conducts water and food — xylem carries water upward from the roots, phloem carries food made in the leaves to the rest of the plant. The leaf is the food factory: photosynthesis happens here. The green pigment chlorophyll traps sunlight, and the leaf uses carbon dioxide (taken in through tiny pores called stomata) and water (brought up from the roots) to make glucose, releasing oxygen. The flower is the reproductive part — stamen is the male part (anther + filament), the carpel/pistil is the female part (stigma, style, ovary). Pedagogy angle: this whole topic is meant to be taught through real specimens and a leaf-print or starch test, not a labelled diagram on the board — Class VI–VIII children learn structure best by handling actual plants. The misconception to hunt for: many children (and weak candidates) think plants 'take in food from the soil through the roots'. They do not — roots take in water and minerals; the plant makes its own food in the leaf by photosynthesis. How it is tested: an inputs/outputs question on photosynthesis, a 'which part does X' match, or a scenario where a teacher corrects the soil-food misconception.

✅ Solved examples

1. A Class VII teacher asks: 'Which gas does a green leaf take IN during photosynthesis, and which gas does it give OUT?' What is the correct answer?
Takes IN carbon dioxide and gives OUT oxygen. The leaf uses CO2 + water in the presence of sunlight and chlorophyll to make glucose, releasing oxygen as a by-product.
2. Water absorbed by the roots is carried upward to the leaves through which tissue?
Xylem. Xylem conducts water and minerals upward from roots to leaves; phloem carries the food (glucose) made in leaves to the rest of the plant.
3. A student says, 'Plants eat their food from the soil through their roots.' How should the teacher correct this?
Roots absorb water and minerals, not ready-made food. Plants make their own food (glucose) in the leaves by photosynthesis. Identifying this misconception and giving the correct process is the expected answer.
4. In which cell structure of a leaf does photosynthesis actually take place?
In the chloroplasts, which contain the green pigment chlorophyll that traps sunlight. Leaves look green because of chlorophyll.

✏️ Practice — try these, take hints as needed

1. Name the tiny pores on the surface of a leaf through which gases are exchanged.
They open and close.
CO2 enters and water vapour leaves through them.
Stomata
2. Mustard has one main thick root with smaller branches. What type of root system is this?
One dominant main root.
Opposite of fibrous.
Taproot system
3. Which part of a flower is the male reproductive part?
It makes pollen.
Anther + filament.
Stamen
4. List the three raw materials a green plant needs to carry out photosynthesis (besides chlorophyll).
One gas, one liquid, one form of energy.
Think inputs, not products.
Carbon dioxide, water and sunlight

📝 Topic test — 8 questions

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Animals: Nutrition & Body Systems →