Food Chains and Webs - Class 6 Free MCQ Test with solutions

Producers, such as plants, use sunlight to make food through photosynthesis, forming the base of food chains. They do not consume other organisms or break down matter.

Arrows in a food chain indicate the direction of food and energy transfer from producers to consumers, showing who eats whom. They do not represent water flow or predator movement.

Food webs are more accurate because they show the complex feeding relationships and multiple food chains an organism is part of, unlike a single food chain.

Herbivores obtain their energy by eating producers (plants), which store energy from the Sun. They do not absorb sunlight directly or consume other herbivores.

When a herbivore eats plants, some energy is used to keep it alive, some is stored in its body, and some is lost as heat to the surroundings. Only the stored energy is available to carnivores.

Energy decreases along a food chain because some is lost as heat, used for survival, or not transferred, reducing the amount available to the next link.

Mercury is a toxic metal that can accumulate in food chains, harming organisms, especially predators. Oxygen, sugar, and nitrogen are not harmful in this context.

Pesticides can kill non-target organisms, such as butterflies, when they consume contaminated nectar, disrupting food webs. They do not increase energy transfer or break down instantly.

Microplastics form from the breakdown of larger plastic items by sunlight and wave action in oceans. They are not natural minerals, plant matter, or volcanic products.

The Ecobrick Project in South Africa uses non-recyclable plastics to create ecobricks for building structures, reducing plastic waste in oceans, not increasing it.