Botany MCQs for NEET — Practice Questions with Answers

Crassulacean Acid Metabolism (CAM) is a specific adaptation found in xerophytes which allows them to fix CO2 at night, reducing water loss during the day. Other cycles like TCA, Hatch-Slack (C4), and C3 are not exclusive to xerophytes.

In ecology, the term 'ecosystem' refers to a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. Hence, the correct match for Ecology (X) is Ecosystem.

The size of a population in any particular area is influenced by multiple factors, including the availability of food, predation, and environmental pressure. All three factors interact to determine how a population grows or shrinks over time. Therefore, the correct answer is 'All three'.

The term 'carrying capacity' refers to the maximum number of individuals of a particular species that an environment can support sustainably. In this context, the number 500 represents the carrying capacity of the lion population in the forest.

In an ecosystem, humans can occupy different trophic levels. They can be primary consumers when they consume plants and secondary consumers when they consume animals. Therefore, humans can be both primary and secondary consumers, making the correct answer '1 & 3'.

An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. The Earth can be viewed as a large ecosystem where all living and non-living entities interact.

Producers, such as plants and algae, accept the nutrients released into the environment by decomposers. These nutrients are used for their growth and development, which in turn supports the entire food web.

The number of herbivores alone cannot determine the total number of trophic layers in a food chain. The complete structure of the food chain, including primary producers and various levels of consumers, needs to be known to predict the number of trophic layers.