Question

Insects constitute the largest animal group on earth. About 25-30% of the insect species are known to be herbivores. In spite of such huge herbivore pressure, globally, green plants have persistence. One possible reason for this persistence is:
A. Food preference of insects has tended to change with time
B. Herbivore insects have become inefficient feeders of green plants
C. Herbivore population has been kept in control by predators
D. Decline in reproduction of herbivores with time

Answer 1

The green plants are also known as photoautotrophs. They with the assistance of their chlorophyll trap the sunshine energy of the sun and alter it into the energy of an easy carbohydrate, glucose, produced by them from simple inorganic compounds namely $CO_2$ and water. The process is called photosynthesis.

Complete Answer:
From the basic organic material glucose, the plants then form complex organic compounds such as starches, proteins and lipids.
- The producers utilize the self-made organic compounds for building up their bodies and short producing energy to operate the metabolic processes. As the green plants and other green organisms prepare their own food themselves with the help of sunlight they are known as the photoautotrophs. Producers dominate the terrestrial ecosystems being the foremost abundant and large of all groups of organisms there.
- These organisms are also termed as producers. These may be herbs, shrubs, large size trees or free-floating microorganisms called phytoplankton.
- A herbivorous animal is totally dependent on vegetation such as grasses or fruits and vegetables for food and a carnivorous animal is dependent on the meat of herbivores for food. The herbivores are primary consumers and the carnivores are secondary consumers. Omnivores can survive on both plants and animals. Humans are omnivores.

So, our required option is C that is Herbivore population has been kept in control by predators.

Note: Producers that are green plants play an important role in maintaining the carbon dioxide-oxygen balance in nature. The use of $CO_2$ and oxygen during photosynthesis. Producers also are called transducers because the energy trapped in photosynthesis is the energy of the sun and is modified into energy of organic compounds synthesized by them.