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Plant Anatomy & Functions — Homi Bhabha Class 6 Biology MCQs with Solutions
Free Homi Bhabha Class 6 Biology Plant Anatomy & Functions MCQs with step-by-step solutions covering Roots & Stems, Leaves & Photosynthesis, Transpiration, Flowers & Pollination, Seeds: Dispersal & Germination. Practise online on Prepizo — no login needed.
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Sample questions with solutions
Q1 — Roots & Stems · easy · theory
Which part of a plant is usually found under the ground and holds the plant firmly in the soil?
A. Leaf
B. Fruit
C. Flower
D. Root ✓ Correct
Solution: Roots grow down into the soil and grip it tightly, so they anchor the plant and hold it firmly in place.
Q2 — Roots & Stems · easy · theory
Apart from holding a plant in place, what do the roots take in from the soil?
A. Water and minerals ✓ Correct
B. Sound
C. Carbon dioxide
D. Sunlight
Solution: Roots soak up water and dissolved minerals from the soil and pass them to the rest of the plant.
Q3 — Roots & Stems · easy · theory
Which part of the plant carries water from the roots up to the leaves?
A. Root
B. Petal
C. Flower
D. Stem ✓ Correct
Solution: The stem has tiny tubes inside it that carry water up from the roots to the leaves, flowers and fruits.
Q4 — Leaves & Photosynthesis · easy · theory
In which part of a green plant does most of the food-making (photosynthesis) take place?
A. Leaves ✓ Correct
B. Roots
C. Bark
D. Flowers
Solution: Leaves are flat and green and catch plenty of sunlight, so they are the main part where the plant makes its food.
Q5 — Leaves & Photosynthesis · easy · theory
What is the green colouring matter in leaves that helps them make food called?
A. Nectar
B. Starch
C. Chloroform
D. Chlorophyll ✓ Correct
Solution: The green colour of leaves comes from chlorophyll, which traps sunlight energy needed to make food.
Q6 — Leaves & Photosynthesis · easy · theory
Which gas do leaves take in from the air to make their food?
A. Oxygen (O₂)
B. Carbon dioxide (CO₂) ✓ Correct
C. Nitrogen
D. Hydrogen
Solution: Plants use carbon dioxide (CO₂) from the air, along with water and sunlight, to make food during photosynthesis.
Q7 — Transpiration · easy · theory
The loss of extra water from a plant in the form of water vapour is called …
A. Photosynthesis
B. Germination
C. Pollination
D. Transpiration ✓ Correct
Solution: When a plant gives out its extra water as vapour into the air, this process is called transpiration.
Q8 — Transpiration · easy · theory
Most of the water lost by a plant during transpiration escapes from its …
A. Roots
B. Flowers
C. Leaves ✓ Correct
D. Woody stem
Solution: Leaves have many tiny pores (stomata), so most of the plant’s water vapour is lost from the leaves.
Q9 — Transpiration · easy · theory
On which day would a plant usually lose water by transpiration the fastest?
A. A cool, cloudy day
B. A hot, sunny day ✓ Correct
C. A rainy day
D. A cold winter night
Solution: Heat and sunshine make water evaporate faster, so a plant transpires most quickly on a hot, sunny day.
Q10 — Flowers & Pollination · easy · theory
The brightly coloured parts of a flower that help to attract insects are the …
A. Thorns
B. Petals ✓ Correct
C. Seeds
D. Roots
Solution: Petals are the colourful parts of a flower, and their colour helps attract insects that carry pollen.
Q11 — Flowers & Pollination · easy · theory
The part of a flower that makes pollen grains is called the …
A. Root
B. Sepal
C. Petal
D. Stamen ✓ Correct
Solution: The stamen is the male part of the flower, and it produces the powdery pollen grains.
Q12 — Flowers & Pollination · easy · theory
The transfer of pollen grains from one part of a flower to another is called …
A. Germination
B. Digestion
C. Transpiration
D. Pollination ✓ Correct
Solution: When pollen moves from the stamen to the female part of a flower, the process is called pollination.
Q13 — Seeds: Dispersal & Germination · easy · theory
The growing of a tiny new plant out of a seed is called …
A. Pollination
B. Transpiration
C. Respiration
D. Germination ✓ Correct
Solution: When a seed sprouts and a baby plant begins to grow from it, the process is called germination.
Q14 — Seeds: Dispersal & Germination · easy · theory
The scattering of seeds away from the parent plant to new places is called seed …
A. Melting
B. Dispersal ✓ Correct
C. Breathing
D. Digestion
Solution: Spreading seeds to new places, away from the parent plant, is called seed dispersal.
Q15 — Seeds: Dispersal & Germination · easy · theory
Which of these does a seed most need to start growing (germinating)?
A. Water ✓ Correct
B. Sand
C. Ice
D. Salt
Solution: A seed must take in water to soften and swell before it can sprout, so water is needed for germination.
Q16 — Roots & Stems · hard · theory
The thick roots that grow downward from the branches of a banyan tree to support it are called …
A. Leaf veins
B. Prop roots ✓ Correct
C. Taproots
D. Fibrous roots
Solution: A banyan tree grows special aerial roots from its branches down to the ground; these prop roots support the heavy spreading branches.
Q17 — Roots & Stems · hard · theory
A white flower is kept in a glass of red-coloured water. After some hours its petals turn reddish. This shows that the stem …
A. Turns red only in sunlight
B. Eats the water
C. Carries water up to the flower ✓ Correct
D. Makes its own red colour
Solution: The coloured water rises through the tubes in the stem and reaches the petals, showing that the stem carries water upward to all parts of the plant.
Q18 — Leaves & Photosynthesis · hard · theory
Green plants can make their own food but animals cannot. The main reason is that plants have …
A. Chlorophyll to trap sunlight ✓ Correct
B. More water inside them
C. Bigger bodies
D. No need for food
Solution: Only plants have chlorophyll, which captures sunlight to make food. Animals have no chlorophyll, so they must eat plants or other animals.
Q19 — Leaves & Photosynthesis · hard · theory
A healthy green plant is kept inside a completely dark cupboard for many days. What is most likely to happen?
A. It gives out more oxygen
B. It makes much more food
C. It grows greener and stronger
D. It cannot make food and becomes pale and weak ✓ Correct
Solution: Without sunlight the plant cannot carry out photosynthesis, so it makes no food and slowly turns pale and weak.
Q20 — Transpiration · hard · theory
Why does a plant transpire much more on a hot and windy day than on a still, cool day?
A. Cold makes water leave faster
B. Heat and wind make water evaporate faster from the leaves ✓ Correct
C. The leaves drink extra water
D. The wind pushes water into the roots
Solution: Warmth speeds up evaporation and wind carries the water vapour away quickly, so both make the plant transpire faster.
Q21 — Transpiration · hard · theory
Besides removing extra water, transpiration also helps the plant by …
A. Cooling it down, just as sweating cools our body ✓ Correct
B. Colouring the leaves green
C. Stopping water from reaching the roots
D. Making the plant heavier
Solution: As water vapour escapes it carries away heat, so transpiration cools the plant much like sweating cools our skin.
Q22 — Flowers & Pollination · hard · theory
A flower that is dull in colour, has no scent, and produces light, dry pollen is most likely pollinated by …
A. Wind ✓ Correct
B. Birds
C. Butterflies
D. Bees
Solution: Flowers pollinated by wind do not need bright colours or scent to attract insects; instead they make light pollen that the wind blows away.
Q23 — Flowers & Pollination · hard · theory
Why do many farmers and gardeners like to have bees near their crops?
A. Bees help pollinate the flowers, so more fruits and seeds form ✓ Correct
B. Bees pull out the weeds
C. Bees give shade to the crops
D. Bees water the plants
Solution: As bees visit flowers they spread pollen from flower to flower, and good pollination leads to more fruits and seeds.
Q24 — Seeds: Dispersal & Germination · hard · theory
A coconut has a light, spongy husk and can float. This mainly helps the coconut to be carried to new places by …
A. Water ✓ Correct
B. Bees
C. Wind
D. Ants
Solution: Because the coconut floats, rivers and sea water can carry it far away, so it is dispersed by water.
Q25 — Seeds: Dispersal & Germination · hard · theory
Some seeds have tiny hooks or spines that catch onto the fur of animals and onto our clothes. How are such seeds mostly spread?
A. By floating on rivers
B. By flying with their own wings
C. By being eaten by fish
D. By sticking to animals and people who carry them away ✓ Correct
Solution: The hooks make the seeds stick to passing animals and to clothes, and they are carried to new places before dropping off.
Q26 — Roots & Stems · medium · theory
When we eat a carrot or a radish, which part of the plant are we eating?
A. Flower
B. Root ✓ Correct
C. Stem
D. Leaf
Solution: A carrot and a radish are swollen roots that store food, so we are eating the root of the plant.
Q27 — Roots & Stems · medium · theory
A potato may look like a root, but it is really an underground …
A. Stem ✓ Correct
B. Leaf
C. Flower
D. Root
Solution: A potato is a swollen underground stem that stores food. You can tell because it has "eyes" (buds) that grow into new shoots.
Q28 — Roots & Stems · medium · theory
A grass plant has many thin roots of nearly the same size instead of one main root. This kind of root is called a …
A. Storage root
B. Prop root
C. Fibrous root ✓ Correct
D. Taproot
Solution: When there is no single main root and many thin roots grow together, it is called a fibrous root, as seen in grass and wheat.
Q29 — Leaves & Photosynthesis · medium · theory
While making food in sunlight, green plants give out a gas that we need for breathing. Which gas is it?
A. Carbon dioxide (CO₂)
B. Nitrogen
C. Oxygen (O₂) ✓ Correct
D. Smoke
Solution: During photosynthesis plants release oxygen (O₂), the gas that humans and animals need to breathe.
Q30 — Leaves & Photosynthesis · medium · theory
The tiny pores on the surface of a leaf through which gases go in and out are called …
A. Veins
B. Petals
C. Roots
D. Stomata ✓ Correct
Solution: Stomata are the small openings on a leaf that let carbon dioxide in and oxygen out during food-making.