Page 8 - Biology Form Two

Biology for Secondary Schools

manufactured by other organisms or feed Herbivorous: This is a mode of feeding
on other organisms directly. Examples of in which an organism feeds on plants.
heterotrophs include all animals, fungi, Animals that undergo this type of feeding

most bacteria, and protoctists. The mode are called herbivores because they eat
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of feeding in which an organism is unable plants or parts of plants. Examples
to make its own food but depends on of plant eaters or herbivores include
food already made by other organisms is grasshoppers, cattle, rabbits, goats,
called heterotrophic nutrition. There are antelopes, and giraffes.

various types of heterotrophic nutrition, Omnivorous: This is a mode of feeding
including holozoic, saprophytic, and in which an organism feeds on both
symbiotic nutrition. plant and animal food sources. They
also feed on other organisms including
Holozoic nutrition fungi and algae. They are also known as
This mode of nutrition involves taking opportunistic feeders because they feed
in complex food substances, digesting, on a variety of food sources. Examples
absorbing, and assimilating the nutrients of omnivorous animals include human

into the organism’s body. The undigested beings, bears, chimpanzees, birds, pigs,
and indigestible food remains are finally turtles, lizards, and certain insects such
egested as faeces. This type of nutrition as crickets, ants, and wasps.
is found in most animals. Holozoic Saprophytic nutrition

nutrition is divided into three modes of This is a mode of feeding in which an
feeding: carnivorous, herbivorous and organism feeds on decaying organic
omnivorous. matter. Such decaying matter may

Carnivorous: This is a mode of originate from plants, animals, and other
feeding in which an animal feeds on decomposing materials. Organisms
other animals. Examples of animals that obtain their food from dead and
that practise this type of feeding are decaying organic matter are called
driver ants, ground beetles, lions, saprophytes. In this mode of feeding, a
tigers, and leopards. These animals are saprophyte releases digestive enzymes
called carnivores because they eat other externally on the substrate. The released
animals, usually of different species. enzymes convert complex organic
In this kind of feeding relationship, molecules such as starch into simple
animals that hunt other animals are molecules such as glucose. The glucose
called predators, while those that are can be easily absorbed by body cells and
hunted are called preys.

Student’s Book - Form Two
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05/10/2024 15:36:17
BIOLOGY FORM 2 NEW.indd 2
BIOLOGY FORM 2 NEW.indd 2 05/10/2024 15:36:17