2021-22 GRD 7 A,B,C SCIENCE CH-NUTRITION IN ANIMALS (NOTEBOOK AND WORKBOOK EXERCISE)

 

2021-22 GRD 7 A SCIENCE CH-NUTRITION IN ANIMALS (NOTEBOOK AND WORKBOOK EXERCISE)

SCIENCE NOTEBOOK FORMAT VIDEO

CH 2 NUTRITION IN ANIMALS

(NOTEBOOK EXERCISE AND WORKBOOK EXERCISE)

FOR GRADE 7 A MAIL ID (podarinshiya5980@gmail.com)

GRADE 7 B MAIL ID ( Nikul.senghani@podar.org)

GRADE 7 C MAIL ID ( sunayana.sonawane@podar.org)

NOTEBOOK WORK  

NOTE: CAN DRAW DIAGRAMS AS AND WHERE NEEDED

DIAGNOSTIC TEST- GOOGLE FORM

KWL CHART

NEW WORDS

1. engulf

2. villi

3. peristalsis

4. psedopodia

5. chyme

NEW TERMS

1. Engulf: sweep over (something) so as to surround it or cover it completely

2. Mastication: the mechanical grinding of food into smaller pieces by teeth

Answer the following in one word or one sentence. 

 a. Which enzyme present in saliva acts on starch?

ANS.  An enzyme amylase present in the saliva breaks down the starch present in food into simpler forms.

 b. Where is bile stored? 

ANS. Bile  is stored in the gall bladder before it is released into the small intestine.

 c. Which glands present in the mouth help in the breakdown of food? 

ANS. The Salivary glands present in the mouth help in the breakdown of the food.

 d. Which group of animals have a four-chambered stomach?

ANS. The Ruminants have a four chambered stomach. 

 e. Which finger-like projections are found on the inner lining of the small intestine? 

ANS. Villi are finger like projections that are found on the inner lining of the small intestine.

 Answer the following questions in brief. 

a. What is Phagocytosis? 

• ANS. The pseudopodia surround the food particle and engulf it into the body. 
•  Food particle is digested with help of hydrolytic enzymes in the food vacuole and then assimilated. 
• This process of engulfing a food particle and breaking it down inside a cell is known as phagocytosis.

b. What is holozoic nutrition? 

ANS. HOLOZOIC NUTRITION: The animal consumes the whole solid or liquid food which is then broken down or digested into simpler substances.

 • The useful substances are absorbed by the body. 

 • The undigested and harmful substances are thrown out of the body. 

 • Example - All herbivores, carnivores and omnivores

c. What are the different chambers of a ruminant’s stomach?

ANS. The stomach of animals that digest cellulose is divided into four chambers – rumen, reticulum, omasum and abomasum.  

d. Name the glands which help in the digestion of food in the small intestine of humans. 

ANS. The chyme from the stomach that enters the small intestine is mixed with the pancreatic juice secreted by the pancreas, bile secreted by the liver and the intestinal juice secreted by the small intestine.

 Give reason. 

a. Hydrochloric acid does not corrode the lining of the stomach. 

ANS. The mucous lining of the stomach protects it from the corrosive effects of the acids.

b. It is advisable to brush our teeth twice a day. 

ANS. The sugar and starch in the food items are converted to acids by the plaque. These acids corrode the enamel and may cause tooth decay and cavities. In order to prevent the formation of plaque and tooth decay, we must brush our teeth twice a day to remove all residual food particles.

 Answer the following questions in detail. 

a. Explain parasitic nutrition with examples. 

• ANS. Animals that live inside or outside the body of other animals and obtain nutrition from there are called parasites. This mode of nutrition is called parasitic nutrition and the animal in/on which the parasite lives is harmed in this process. 
• For example, a leech is a parasite that feeds on human and animal blood. A tapeworm is a parasite that lives in the intestines of other animals.

 b. Write a note on the small intestine and its role in digestion of food. 

ANS. Small intestine 

•  The secretions from the liver, gall bladder and pancreas are released into the small intestine through a duct known as the common bile duct.
•  The small intestine is 6-7m long with a diameter of about 3-4 cm and is accommodated inside the body in a highly coiled manner. 
• It is the longest organ of the digestive tract. It is divided into three segments- duodenum, jejunum, and ileum. 
• The small intestine is the main organ of the digestive tract where the complete digestion of food and absorption of nutrients takes place. 
• The chyme from the stomach that enters the small intestine is mixed with the pancreatic juice secreted by the pancreas, bile secreted by the liver and the intestinal juice secreted by the small intestine.

 c. Explain the steps in nutrition. 

• ANS. There are five steps of nutrition in animals – ingestion, digestion, absorption, assimilation and egestion.
•  Ingestion The process of consuming food is known as ingestion. Some ways in which animals ingest food are:  
• Humans and other animals ingest food through the mouth. --
•  • Paramoecium has hair-like cilia that pushes food into the cell. • Frogs and chameleons have long sticky tongues to catch their prey. 
•  • Butterflies suck nectar from flowers with a long tube called proboscis. 
•  Digestion The food eaten by an animal is broken down further into smaller parts so that it can be absorbed by the body. This process of breaking down food into small and simple compounds to be absorbed by the body is known as digestion. 
• Absorption The digested food contains nutrients and has to be transported to all parts of the body. The process of extracting nutrients from the digested food and carrying them to all parts of the body is known as absorption. 
• Assimilation The nutrients absorbed from the food are utilised for growth, repair and maintenance of the body. This process is known as assimilation. 
• Egestion After absorbing nutrients and useful substances from the food, the undigested food along with waste material is excreted from the body. This process is known as egestion.

d. What is the function of the large intestine in the digestion of food in human beings?

• ANS. The main function of the large intestine is the absorption of water from the undigested food. 
•  The excess water and salts are absorbed in the large intestine and the remaining undigested food is stored in the rectum before it is passed out of the body. 
• The food is stored in the rectum as semi-solid faeces.

Q. DRAW A LABELLED DIAGRAM OF STRUCTURE OF TOOTH(CAN COLOR TOO) AND WRITE ITS FUNCTION

ANS. Structure of a Tooth Each tooth consists of the following parts: 

 • Crown - The part of the tooth that is visible above the gums.

 • Root - The unseen portion that supports and holds the tooth in place. 

 • Pulp – The soft core richly supplied with blood vessels and nerves. A tooth is made up of a bone-like hard structure called dentine. The dentine is covered with a hard, shiny covering known as the enamel. Enamel is the hardest substance in our body.

DRAW DIAGRAM FROM TB PG NO.23

9. Diagram based question

PLEASE COMPLETE Q.9 a,b in N.B

Q.9 A. ALSO HAVE TO DRAW FIGURE LABEL IT

Q.9 B. HAVE TO DRAW THE FLOW CHART

HOTS (Higher Order Thinking Skills) 

Why is it recommended to include green leafy vegetables and salads in our diet?

ANS. TO BE DONE BY YOURSELF

LINK TO WORKBOOK EXE3RCISE👇👇

WORKBOOK EXERCISE- CH NUTRITION IN ANIMALS

NOTE:PLEASE SUBMIT NOTEBOOK AND WORKBOOK WORK TILL 29/6/2021