Topic : Nutrition animals.
1. Name the following:
a) The mode of nutrition in animals.
b) The structures helps in taking in of food in amoeba.
c) The structures helps in detecting taste of food in humans.
2. Fill in the blanks:
a) Digestion starts in __________.
b) The inner wall of ________ has many finger –like projections called villi.
c) In amoeba digestion takes place in _________.
d) ________ secretes bile juice that helps to digest ______.
e) _______ is a sac-like muscular organ in the alimentary canal.
3. Describe the steps that the food undergoes during the process of digestion.
4. What are villi ? What is the function of villi?
5. Describe the function of saliva.
6. Draw and label the human digestive system.
7. Why does bread or chapatti taste a little sweet after it is chewed for
Sometime?
8. An athlete drinks a glucose drink just after a race. Why?
9. How does amoeba engulfs food?
10. Discuss the role of tongue in our digestive tract.
Answers
Answer:
1. a) Hetrotrophic
b) Pseudopodia or false feet
c) Taste buds
2.a) Mouth
b) Small intestine
c) Cell
d) Liver, Fats
e) Stomach
3.Steps of Food Digestion
Digestion is the process in which the body breaks down food into molecules that can be used for nourishment. The stomach is not the only organ involved in the digestion process. ...
Mouth. ...
Esophagus. ...
Stomach. ...
Small Intestine. ...
Liver, Gallbladder and Pancreas. ...
Large Intestine.
4. Villi, in anatomy any of the small, slender, vascular projections that increase the surface area of a membrane. Important villous membranes include the placenta and the mucous-membrane coating of the small intestine.
The Function of Villi in the Small Intestine. Background information: The structure of the small intestine is designed for absorption of nutrients. The inside of the small intestine is lined with villi that absorb nutrients from the liquid mixture called chyme produced in the stomach from the food we eat.
5. The digestive functions of saliva include moistening food, and helping to create a food bolus, so it can be swallowed easily. Saliva contains the enzyme amylase that breaks some starches down into maltose and dextrin. Thus, digestion of food occurs within the mouth, even before food reaches the stomach.
7. When chapati is chewed for some time it taste sweeter because, as you know chapati is carbohydrates and it presents starch. When salivary gland secrets saliva, then it breaks carbohydrates into simple glucose that is heroes. It is generally food in our body by hydrolysis of starch.
8. During exercise glycogen is broken down in the muscles and provides energy. Usually there is enough glycogen in muscles to provide fuel for 90-120 minutes of exercise. ... But for some athletes, eating or drinking carbohydrates during exercise helps maintain their blood glucose and energy levels.
9. In Amoeba, cell membrane help in engulfing the food during the process called as endocytosis. Amoeba engulfs food particles with the help of pseudopodia which are the projections of cell membranes. ... Amoeba then secrets digestive enzymes that break down the food particle and digest it.
10. Your tongue helps out, pushing the food around while you chew with your teeth. When you're ready to swallow, the tongue pushes a tiny bit of mushed-up food called a bolus (say: BO-luss) toward the back of your throat and into the opening of your esophagus, the second part of the digestive tract.
Answer:
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