FEEDING MECHANISMS IN HOLOZOIC ORGANISMS
FEEDING MECHANISMS IN HOLOZOIC ORGANISMS
There are three popular organisms which exhibits sucking mechanism. These organisms are mosquito, butterfly and housefly. They insects have different modifications of mouth marts adapted for feeding on food through the mechanism of sucking.
So let’s treat them one after the other
i. Mosquito as an example of sucking insect: the mosquito possesses a piercing mouth part called the proboscis. The proboscis is used for sucking the blood of man and other animals
ii. The mouth parts altogether form a strong stylet capable of penetrating into the skin to suck
iii. The stylet except the labium is sharp and pointed to ease penetration into the skin
iv. The mouth of a typical mosquito can produce saliva to prevent clotting of blood while it is being sucked in
v. The mosquito has the ability to fold back the labium easily so as to allow the stylet to perform its work of penetration of the skin to suck blood
SUCKING MECHANISM OF THE BUTTERFLY
i. The butterfly possesses a long coiled proboscis used for sucking nectars of flowers
ii. The butterfly as an insect is capable of recoiling the long proboscis under its head when not in use.
iii. There is a nonfunctioning of the other mouth parts due to the type of food taken by the insect
SUCKING MECHANISM OF THE HOUSEFLYThe housefly mainly feds on liquid food materials. It has mouth parts modified for sucking in food in the following ways
i. The housefly possesses enlarged labella which are sucking structures for sucking liquid food
ii. The housefly has the ability to feed on solid food like SUGAR by pouring out its saliva to change the food to a liquid state.
iii. The housefly has a sucking mechanism called SPONGING in which the mouth is placed on the liquid food and it will start to rush into the mouth
iv. The labella of the housefly have fine channels which aid rapid absorption of liquid food into the mouth
THE GRINDING MECHANISMSGrinding mechanism is common among mammals e.g. man, goat, sheep, lion etc. these animals are capable of grinding the food before swallowing. The grinding of food is aided by the presence of hard and strong teeth made of enamel and dentine.
The animals are adapted to the grinding mechanisms by the following
ii. The teeth are strong and hard to withstand biting, chewing or grinding and cracking of solid food like bones
iii. The possess incisors which have sharp and flat edged used for biting off bits of food
iv. Animals have pointed canine teeth used for tearing solid food
v. There is the presence of pre-molars and molars with undulating and wide surface to enable grinding of food
vi. The absence of front teeth or incisors in herbivores like sheep is a special adaptation as it helps to grip the grasses during feeding by the animal.
TRAPPING AND ABSORBING MECHANISM
The trapping and absorbing mechanism are common among insectivorous or carnivorous plants such as bladderwort and sundew.
The bladderwort and sundew have structures which enable them to adapt to this mode of feeding or nutrition
i. Sundew for example is capable of trapping insect by undergoing nastic movement in response to touch from the body of the insect
ii. The sundew leaf has long hairs which carry digestive glands
iii. Insect landing on these hairs causes other hairs to coil over it
iv. The sundew is capable of secreting a fluid rich in enzymes to digest the insect externally
v. The protein so synthesized is easily absorbed by the carnivorous plant into its body
Here are some related post on the subject of nutrition and modes of feeding in living organisms1. Modes of nutrition in animals
2. Saprophytic nutrition
3. Parasitic nutrition
4. Forages and farm animal nutrition
5. Water as a food substance
6. Carnivorous nutrition in plants
7. Endoparasites and Ectoparasites feeding modes
8. Holozoic mode of nutrition
9. Heterotrophic mode of nutrition
10. Autotrophic nutrition
11. Chemosynthetic nutrition
12. Importance of balance diet
13. What is Kwashiokor?
14. How to test for food
15. Vitamin deficiency symptoms
16. Mineral deficiency symptoms
17. Types of carbohydrates
18. Food substances
19. Classification of food substances
20. Growth in living organisms
21. Types joints
22. The human skeleton
23. The skeletal system
24. The vertebrates and invertebrates
26. Appendicular skeleton
27. Topical index of all pages
31. The cell and its environment
32. Mitosis and meiosis
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Fabian has B.Sc in agriculture and biology. has taught in various schools and colleges. Certified computer technician and a trained auto mechanic, and I took to writing online in order to reach millions of people who would want to learn using their electronic gadgets to enhance their knowledge. I have major on Agricultural science, biology, health sciences and home economics
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