Which statement is correct with respect to the food chain?

Every component of food chain forms trophic level

Inter-relation between different food chains is known as a food web

All the chains formed by nutritional relations is used to understand energy flow.

“The pyramid of energy is always upright” states that

The energy conversion efficiency of herbivores is better than carnivores

The energy conversion efficiency of carnivores is better than herbivores

Producers have the lowest energy conversion efficiency

Energy conversion efficiency is the same in all trophic levels

Environmental Asiignment No 1

1.

The natural place of an organism or community is known as
- A.
  
  Habit
- B.
  
  Habitat
- C.
  
  Biome
- D.
  
  Niche
Correct Answer
B. Habitat

Explanation
Habitat refers to the natural place where an organism or community lives. It includes the physical environment such as the climate, soil, and other abiotic factors, as well as the biotic factors like other species that coexist in the same area. A habitat provides the necessary resources and conditions for an organism to survive, reproduce, and carry out its normal activities. It is the specific location or area that is suitable for a particular species or community to thrive and fulfill their ecological roles.

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2.

Which is the renewable exhaustible natural energy resource?
- A.
  
  Coal
- B.
  
  Petroleum
- C.
  
  Kerosene
- D.
  
  Biomass
Correct Answer
D. Biomass

Explanation
Biomass is considered a renewable exhaustible natural energy resource because it is derived from organic matter such as plants, crop residues, and animal waste, which can be replenished through natural processes. It can be used for heating, electricity generation, and transportation fuel. Unlike coal, petroleum, and kerosene, which are fossil fuels and take millions of years to form, biomass can be continuously produced and utilized without depleting finite resources. Therefore, biomass is a sustainable and renewable energy option.

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3.

An orchid living on a tree exhibit
- A.
  
  Predator
- B.
  
  Parasite
- C.
  
  Commensalism
- D.
  
  Heterocytes
Correct Answer
C. Commensalism

Explanation
Commensalism is a type of relationship where one organism benefits while the other is neither harmed nor benefited. In the case of an orchid living on a tree, the orchid benefits by using the tree as a support structure to grow and access sunlight, while the tree is not affected by the presence of the orchid. Therefore, this relationship can be classified as commensalism.

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4.

Which statement is correct with respect to the food chain?
- A.
  
  Every component of food chain forms trophic level
- B.
  
  Inter-relation between different food chains is known as a food web
- C.
  
  All the chains formed by nutritional relations is used to understand energy flow.
- D.
  
  All of the above
Correct Answer
D. All of the above

Explanation
The statement "Every component of food chain forms trophic level" is correct because each organism in a food chain occupies a specific trophic level based on its position in the chain. The statement "Inter-relation between different food chains is known as a food web" is also correct because a food web is a network of interconnected food chains that shows the relationships between different organisms and their sources of food. Finally, the statement "All the chains formed by nutritional relations are used to understand energy flow" is correct because studying all the food chains helps in understanding how energy is transferred from one organism to another in an ecosystem.

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5.

Which of the following requires maximum energy?
- A.
  
  Secondary consumer
- B.
  
  Primary producer
- C.
  
  Primary consumer
- D.
  
  Decomposer
Correct Answer
B. Primary producer

Explanation
Primary producers require the maximum energy because they are able to convert sunlight into chemical energy through the process of photosynthesis. They are at the bottom of the food chain and provide energy for all other organisms in the ecosystem. Secondary consumers, primary consumers, and decomposers obtain their energy from consuming other organisms, making them dependent on the energy stored in the primary producers.

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6.

Which is not the characteristic of a population?
- A.
  
  Natality
- B.
  
  Mortality
- C.
  
  Stratification
- D.
  
  Sex retio
Correct Answer
C. Stratification

Explanation
Stratification is not a characteristic of a population. Stratification refers to the division of a population into different social or economic levels or classes. It is a concept related to social sciences and not directly related to the characteristics of a population, such as natality (birth rate), mortality (death rate), or sex ratio (proportion of males to females in a population).

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7.

The ability of a population to increase under ideal environmental conditions is called
- A.
  
  Natality
- B.
  
  Biotic potential
- C.
  
  Carrying capacity
- D.
  
  Absolute natality
Correct Answer
A. Natality

Explanation
Natality refers to the birth rate or the number of births in a population over a specific period of time. It represents the potential of a population to increase in numbers under ideal environmental conditions. This includes factors such as the availability of resources, absence of predators or diseases, and favorable climatic conditions. Natality is an important factor in determining the growth and expansion of a population.

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8.

In an ecosystem, the energy flow is always
- A.
  
  Always unidirectional
- B.
  
  Always Bidirectional
- C.
  
  In any Direction
- D.
  
  Always down direction
Correct Answer
A. Always unidirectional

Explanation
In an ecosystem, the energy flow is always unidirectional. This means that energy flows from the producers, such as plants, to the consumers, such as animals, and then to decomposers, such as bacteria and fungi. This flow is unidirectional because energy is transferred from one trophic level to the next and is not recycled back to the previous level. This is due to the second law of thermodynamics, which states that energy tends to flow from areas of higher concentration to areas of lower concentration. Therefore, energy flow in an ecosystem is always unidirectional.

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9.

“The pyramid of energy is always upright” states that
- A.
  
  The energy conversion efficiency of herbivores is better than carnivores
- B.
  
  The energy conversion efficiency of carnivores is better than herbivores
- C.
  
  Producers have the lowest energy conversion efficiency
- D.
  
  Energy conversion efficiency is the same in all trophic levels
Correct Answer
A. The energy conversion efficiency of herbivores is better than carnivores
10.

Plant species with a wide range of genetic distribution evolve into a local population known as
- A.
  
  Ecotype
- B.
  
  Population
- C.
  
  Ecosystem
- D.
  
  Biomass
Correct Answer
A. Ecotype

Explanation
Ecotype refers to a local population of a plant species that has evolved and adapted to specific environmental conditions within a particular geographic area. These populations develop distinct genetic characteristics, allowing them to thrive and survive in their specific habitat. The wide genetic distribution of plant species allows for the development of different ecotypes in various regions, each with unique traits suited to their local environment. Therefore, ecotype is the correct answer in this context.

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Environmental Asiignment No 1

The natural place of an organism or community is known as

Which is the renewable exhaustible natural energy resource?

An orchid living on a tree exhibit

Which statement is correct with respect to the food chain?

Which of the following requires maximum energy?

Which is not the characteristic of a population?

The ability of a population to increase under ideal environmental conditions is called

In an ecosystem, the energy flow is always

“The pyramid of energy is always upright” states that

Plant species with a wide range of genetic distribution evolve into a local population known as