Autotroph are organism that make their own food.

All living things need food. Most organisms cannot make their own food. They must eat or consume their food. These organisms are called consumers.

A heterotroph (/ˈhɛtərəˌtroʊf, -ˌtrɒf/; from Ancient Greek ἕτερος héteros “other” and τροφή trophḗ “nutrition”) is an organism that cannot produce its own food, instead taking nutrition from other sources of organic carbon, mainly plant or animal matter.

Autotrophic organisms make their own food by a process called photosynthesis. Green plants, for example, manufacture sugar and starch from carbon dioxide and water using the energy of sunlight to drive the necessary chemical reactions. Heterotrophic organisms obtain their food from the bodies of other organisms.

An autotroph (or producer) is an organism that makes its own food from light energy or chemical energy without eating. Most green plants, many protists (one-celled organisms like slime molds) and most bacteria are autotrophs.

Therefore, human beings can be considered as primary consumers when they feed on plants and their products and they can also be considered as secondary consumers when they feed on animals, which are primary consumers. Hence, human beings can occupy second as well as third trophic level of a particular food chain.

Level 1: Plants and algae make their own food and are called producers. Level 2: Herbivores eat plants and are called primary consumers. Level 3: Carnivores that eat herbivores are called secondary consumers. Level 4: Carnivores that eat other carnivores are called tertiary consumers.

2.2

(Entry 1 of 2) 1 : of or relating to nutrition : nutritional trophic disorders. 2 : tropic entry 3. 3 : promoting cellular growth, differentiation, and survival.

Trophic, from Ancient Greek τροφικός (trophikos) “pertaining to food or nourishment”, may refer to: Trophic cascade.

four trophic levels

The trophic effects in the stomach are manifested as an increased weight and thickness of the oxyntic mucosa and can be induced by both exogenous and endogenous gastrin–that is, in situations of long-lasting hypergastrinemia (treatment with effective antisecretagogues, partial fundectomy, or antrum exclusion).

vertebrates produce essentially the same tropic hormones: thyrotropin (TSH), corticotropin (ACTH), melanotropin (MSH), prolactin (PRL), growth hormone (GH), and one or two gonadotropins (usually FSH-like and LH-like hormones).

These AL tropic hormones are regulated by the hypothalamic releasing and inhibiting hormones corticotropin-releasing hormone (CRH), thyrotropin-releasing hormone (TRH), prolactin-inhibiting hormone (PIH or dopamine), prolactin-releasing factor (PRF), gonadotropin-releasing hormone (GnRH), growth hormone-releasing …

cortisol

Growth hormone’s major tropic effect is to stimulate the release of insulin-like growth factors (IGFs) from the liver, which causes bone growth. Growth hormone also stimulates a number of tissues through non-tropic mechanisms to affect metabolism and raise blood glucose levels.