OUR ENVIRONMENT CLASS 10 CBSE #ourenvironment

The animals which occupy the same trophic level are:

• Lion and bees

• Deer and bees

• Snakes and earth worms

• Crow and cows

• None of the above

Answer explanation

Deer and bees occupy the same trophic level as they are both primary consumers. Deer are herbivores feeding on plants, while bees pollinate flowers and also feed on nectar, placing them in the same level of the food chain.

The energy flow in an eco system is:

• energy is recycled within the ecosystem

• one-way direction from producers to consumers to decomposers

• energy flows equally among all species

• a circular flow between all organisms

Answer explanation

The correct answer is that energy flows in a one-way direction from producers to consumers to decomposers. This means energy is not recycled but rather transferred through different trophic levels in the ecosystem.

Which one of the following is an artificial eco system

[SQP,2020]

• Pond

• Crop field

• Lake

• Forest

Answer explanation

A crop field is an artificial ecosystem created by humans for agricultural purposes, unlike natural ecosystems like ponds, lakes, and forests which develop without human intervention.

ASSERTION : First trophic level in a food chain is always a green plant

REASON: Green plants are called producers

• Both are True

• Both are False

• Not applicable
• Maybe

Answer explanation

Green plants are producers and the first trophic level in a food chain is producers

Which of the following is a primary consumer in a food chain?

• Decomposer

• Fox

• Rabbit

• Grass

Answer explanation

In a food chain, primary consumers are organisms that eat producers. Grass is a producer, while the rabbit, which eats grass, is a primary consumer. The fox is a secondary consumer, and decomposers break down dead matter.

What is the role of decomposers in an ecosystem?

• To produce energy

• To compete with primary consumers

• To consume primary producers

• To break down dead organic matter

Answer explanation

Decomposers play a crucial role in ecosystems by breaking down dead organic matter, recycling nutrients back into the soil, and supporting the growth of primary producers. This process is essential for maintaining ecosystem health.

Which of the following best describes a food web?

• A diagram showing only producers

• A linear sequence of energy transfer

• A simple chain of trophic levels

• A complex network of feeding relationships

Answer explanation

A food web is best described as a complex network of feeding relationships, illustrating how various organisms interact within an ecosystem, unlike the other options which oversimplify these interactions.

Which of the following organisms is considered a secondary consumer?

• Decomposer

• Grasshopper

• Plant

• Frog

Answer explanation

A frog is a secondary consumer as it feeds on primary consumers like grasshoppers. Decomposers break down organic matter, and plants are primary producers, not consumers.

What is the primary source of energy for most ecosystems?

• Water

• Sunlight

• Wind

• Soil nutrients

Answer explanation

The primary source of energy for most ecosystems is sunlight. It drives photosynthesis in plants, which form the base of the food chain, supporting all other life forms in the ecosystem.

Which of the following statements about food chains is true?

• They always start with a carnivore

• They can have multiple starting points

• They represent a single pathway of energy flow

• They include only herbivores

Answer explanation

Food chains represent a single pathway of energy flow, illustrating how energy moves from producers to various consumers. They do not start with carnivores, have multiple starting points, or include only herbivores.