Online Test — Nutrition in Plants
25 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 25
The process of taking in food and using it for energy, growth, and repair is called:
Respiration
Nutrition
Digestion
Excretion
Explanation: Nutrition is the taking in and use of food for energy, growth, and repair.
Question 2 of 25
Organisms that make their own food are said to be:
Heterotrophic
Autotrophic
Parasitic
Saprophytic
Explanation: Autotrophs make their own food from simple raw materials.
Question 3 of 25
Green plants are called ______ in a food chain.
Consumers
Producers
Decomposers
Predators
Explanation: Green plants produce their own food (and food for others), so they are producers.
Question 4 of 25
Which of the following follows the heterotrophic mode of nutrition?
Grass
A green tree
A deer
Algae
Explanation: A deer cannot make its own food and depends on plants, so it is a heterotroph.
Question 5 of 25
The ultimate source of energy for almost all food chains is the:
Soil
Sun
Wind
Water
Explanation: Green plants capture the Sun's energy in food, on which other organisms depend.
Question 6 of 25
The process by which green plants make their own food is called:
Respiration
Photosynthesis
Digestion
Transpiration
Explanation: Photosynthesis is the making of food by green plants using light.
Question 7 of 25
The raw materials needed for photosynthesis are:
Oxygen and glucose
Carbon dioxide and water
Nitrogen and starch
Oxygen and water
Explanation: Photosynthesis uses carbon dioxide and water as its raw materials.
Question 8 of 25
The green pigment that captures sunlight is:
Haemoglobin
Chlorophyll
Starch
Glucose
Explanation: Chlorophyll is the green pigment that captures light energy for photosynthesis.
Question 9 of 25
The gas released as a by-product of photosynthesis is:
Carbon dioxide
Nitrogen
Oxygen
Hydrogen
Explanation: Photosynthesis releases oxygen as a by-product.
Question 10 of 25
A leaf that has made food turns blue-black when tested with:
Litmus
Iodine solution
Lime water
Vinegar
Explanation: Iodine turns blue-black with starch, showing the leaf has photosynthesised.
Question 11 of 25
Photosynthesis takes place mainly in the plant's:
Roots
Leaves
Stem
Flowers
Explanation: Leaves contain chlorophyll and are the main site of photosynthesis.
Question 12 of 25
The tiny pores on a leaf through which gases pass in and out are called:
Veins
Stomata
Roots
Petals
Explanation: Stomata are the tiny pores on the leaf for the exchange of gases.
Question 13 of 25
The opening and closing of a stoma is controlled by:
Veins
Guard cells
Chlorophyll
Roots
Explanation: Guard cells on either side of a stoma control its opening and closing.
Question 14 of 25
Which of the following is NOT a condition needed for photosynthesis?
Sunlight
Chlorophyll
Carbon dioxide
Darkness
Explanation: Photosynthesis needs sunlight, chlorophyll, carbon dioxide, and water — not darkness.
Question 15 of 25
The leaf is often called the plant's:
Storehouse
Food factory
Pump
Skeleton
Explanation: The leaf makes the plant's food by photosynthesis, so it is the food factory.
Question 16 of 25
Cuscuta (Amarbel) obtains its food by living as a:
Saprophyte
Parasite
Symbiont
Producer
Explanation: Cuscuta draws food from a living host plant, so it is a parasite.
Question 17 of 25
A pitcher plant traps insects mainly to obtain:
Sunlight
Nitrogen
Water
Oxygen
Explanation: Insectivorous plants trap insects for nitrogen, which is scarce in their soil.
Question 18 of 25
Plants and fungi that feed on dead and decaying matter are called:
Parasites
Saprophytes
Autotrophs
Insectivores
Explanation: Saprophytes feed on dead, decaying matter and act as decomposers.
Question 19 of 25
In a lichen, an alga and a fungus live together so that:
Only the alga benefits
Both benefit
Only the fungus benefits
Neither benefits
Explanation: A lichen is a symbiotic partnership in which both the alga and fungus benefit.
Question 20 of 25
Cuscuta cannot make its own food because it lacks:
Roots
Chlorophyll
Water
A host
Explanation: Cuscuta has no chlorophyll, so it cannot photosynthesise and lives as a parasite.
Question 21 of 25
Which mineral nutrient, needed to make proteins, is especially important for plants?
Oxygen
Nitrogen
Carbon
Chlorine
Explanation: Nitrogen is needed to make proteins and other substances vital for plant growth.
Question 22 of 25
Plants absorb water and minerals from the soil through their:
Leaves
Roots
Flowers
Stomata
Explanation: Roots absorb water and dissolved minerals from the soil.
Question 23 of 25
The bacteria that fix atmospheric nitrogen in the root nodules of legumes are:
Rhizobium
Lactobacillus
Amoeba
Chlorophyll
Explanation: Rhizobium bacteria in legume root nodules fix atmospheric nitrogen.
Question 24 of 25
Plants cannot directly use nitrogen from the:
Soil
Air
Roots
Nodules
Explanation: Plants cannot use atmospheric nitrogen directly; it must first be fixed.
Question 25 of 25
Growing a leguminous crop between other crops to restore soil nitrogen is part of:
Photosynthesis
Crop rotation
Transpiration
Germination
Explanation: Crop rotation with legumes naturally replenishes the soil's nitrogen.