Answer: Option C. -> Do not produce cellulose digesting enzymes.
:
C
Humans cannot digest high fibre containing substances like grass. It won't kill you, but it isn't advisable to snack on it. Human stomachs cannot digest hard raw leaves and grass easily, but cows can. This is because humans do not produce cellulose-digesting enzymes. Having a longer or a shorter alimentary canal is not a deciding factor in this.

Answer: Option B. -> Biomagnification
:
B
Biological magnification or biomagnification is the accumulation of non-biodegradable substances in the food chain. It is found in all types of ecosystems. It leads to higher toxicity in organisms occupying higher trophic levels. E.g., successive increase in the concentration of a pesticide, DDT in an aquatic food chain.

Answer: Option A. -> True
:
A
Biodegradationis a chemical process in which materials are decomposed by bacteria or other biological elements. If a material isbiodegradable, it means that it can be consumed by microorganismsand can be turned into compounds that are natural. It is an important process in ecology and waste management.

Answer: Option C. -> Changes in packaging.
:
C
Improvements in our lifestyle have resulted in greater amounts of waste material generation. Changes in attitude also havea role to play, with more and more things we use becoming disposable.
Changes in packaging have resulted in much of our waste becoming non-biodegradable.Non-biodegradable wastes are materials that will not be decomposed by natural processes. Non-biodegradable waste products have long-lasting effects on land fills, where toxic pollutants often contaminate ground water. Non-biodegradable plastics can also lead to out-gassing.

Answer: Option B. -> Grass, Goat and Human
:
B
Food chain is a series of organisms feeding on one another. From the given options, 'grass, goat and human' forms a food chain. Here, grass prepares its food during photosynthesis and becomes food for a goat, which in turn becomes food for humans. This food chain starts with producers (i.e.,grass) and ends in tertiary consumer (i.e. human).

Answer: Option A. -> True
:
A
Solar energy is captured by autotrophs i.e. green plants. They are then eaten by herbivores and herbivores in turn by carnivores. The energy flows from autotrophs to carnivores. Energy never reverts to the lower trophic levels. Thus, the energy flow is unidirectional.

Answer: Option A. -> producers
:
A
Autotrophs are also known as producers. They occupy the first trophic level. They convert the solar energy into chemical energy making it available for the successive trophic levels.

Answer: Option A. -> True
:
A

Ozone is a deadly poisonous gas though it protects the Earth from harmful UV radiations. In other words, when ozone forms at the surface of our planet as a result of pollutants from cars reacting with UV rays, it turns out to be a lethal pollutant itself.
In its pure form or when mixed with other substances, ozone causes many health hazards in humans. Inhalation of low amounts of ozone causes chest pain, coughing, shortness of breath, throat irritation, lung irritation etc. Ozone can also damage forests and crops. 

Answer: Option C. -> UNEP
:
C

UNEP(United Nations Environment Programme) played an important role in forging an agreement to freeze CFC production to protect the ozone layer from depletion. UNEP uses its expertise to strengthen environmental standards and practices while helping implement environmental obligations at the country, regional and global levels.

Answer: Option B. -> Plastics cannot be decomposed by microbes.
:
B

Plastics are synthetic polymers and are derived from the by-products of petroleum. The monomers derived from petroleum are combined together (polymerization) to make plastic. These polymeric substances cannot be digested or decomposed by any micro-organism and hence plastics are non-biodegradable.