Very Important questions - science - class 7 - chapter 2 - Nutrition in Animals

Very short answer type questions

 

1. What is nutrition

2. Name three glands associated with the digestive system.

3. What does the inner lining of the stomach secrete?

4. Which teeth are used for chewing and grinding?

5. Which carbohydrate is not digested in humans?

 6. Which part of the teeth is used for biting and cutting?

7. Which part of the teeth is used for piercing and tearing?

8. Where does complete digestion of food take place?

9. What does liver secrete?

10. Where is the bile produced? Which component of the food it helps in digestion?

11. What is expelled out of the body through the anus?

 

 

SHORT ANSWER TYPE QUESTIONS

 

  1. What does animal nutrition include?

   2. What is digestion?

   3. What is alimentary canal?

   4. What all constitute human digestive system?

   5. What is ingestion?

   6. What is the role of pseudopodia in nutrition in amoeba?

7. Write two functions of tongue in humans.

8. What is the role of saliva in digestion?

9. Why do we taste food sweeter after chewing it for a longer time?

10. What is the role of HCl in the stomach?

11. Your stomach contains hydrochloric acid, but you don’t experience any burning sensation. Why?

12. What is the role of villi in the intestine?

   13. What is meant by rumen and caecum in ruminants?

  14. How does amoeba ingest its food and where is it digested?

    15. What is liver?

  16. What is a gall bladder? What is its role?

   17. What happens during assimilation of food in man?

  18. Why do we get instant energy from glucose?

   19. What are villi? What are their location and function?

  20. Name the type of carbohydrate that can be digested by ruminants but  not humans. Give the reason also.

  21.Why do we start hiccupping or get choking sensation

  while eating food?

 22.What is meant by assimilation?

23.No digestion occurs in large intestine yet Its role is important. Justify the statement.

24. How do you differentiate between absorption and assimilation?

 

 

 

LONG ANSWER TYPE QUESTIONS 

 

 Q1. Briefly describe the process of  nutrition in amoeba

 Q2. Write the functions of different types of teeth.

 Q3. Briefly explain the process of digestion in ruminants

Q4. Draw a labeled diagram of human digestive system.

 Q5. Mention the various steps involved in the process of nutrition

 

 

 

 

 

Defitions - science - class 7 - chapter 2 - Nutrition in Animals

Definitions

1. Ingestion- The process of taking in food into the body is called ingestion.

2. Digestion- The process in which complex substance of food are broken down into simpler substances it is called digestion.

3. Absorption- The process in which digested food passes into the blood vessels in the walls of small intestine is called absortion.

4. Assimilation- The process by which absorbed substance are transported blood vessels to be utilized is called assimilation.

5. Egestion- The undigested and unabsorbed food residues expelled out of the body through anus is called egestion.

Important notes - science - class 7 - chapter 1 - Nutrition in Plants

1. Difference between Autotrophic nutrition and Heterotrophic nutrition?

 Autotrophic nutrition

• It is a mode of nutrients which autotrophy take in simple inorganic substances like carbon-dioxide and water from outside.
• Carbon and energy requirements are fulfilled by photosynthesis.
• This nutrition's is seen in the green organisms which have chlorophyll.  

Heterotrophic nutrition 

• It is the mode of nutrition in which heterotrophs take in complex material prepares by autotrophs.
• Heterotrophs depends directly or indirectly depend on autotrophs.
• This nutrition occurs in non green organism which do not have chlorophyll. 

2. write a short note on stomata?

• The tiny pores present on the surface of the leaves are called stomata. Theses pores are surrounded by guard cells.
• The guard cells are kidney shaped and are located on either side of the stomata.
• The guard cells regulate the opening and closing of stomata.
• Guard cells have chloroplasts.

3. Role of stomata in plants?

• Exchange of gases takes place in the leaf through stomata during photosynthesis carbon-dioxide is taken in and oxygen is given out.
• Stomata helps in breathing (in plants) oxygen enters in and carbon-dioxide exits.
• Excess of water escapes as water vapor through stomata. Transpiration helps in clotting the plant.  

4. Difference between saprotrophs and parasite.

Saprotrophs

• The organisms which drive the nutrition by decomposing and observing dead organic matter, they have enzymes which have secreted on dead organic matter like wood and leather.
• Ex- Mushroom and Bactria.

Parasite

• The organizms which depend on other organism and derived all the host organism as they cannot synthesis their own food are called parasite.
• Ex- Cuscuta,dodder.

 5.Write a short note on cell?

• Cell is a single organism.
• It can only be seen under the microscope.
• It is enclosed by a thin outer boundary called the cell membrane.
• The cell had a distinct centrally located spherical structure called nucleus.
• The nucleus is surrounded by a jelly like substance called cytoplas.

6. Write about photosynthesis?

• Photo means light and synthesis means combine.
• The energy used to synthesis from carbon-dioxide and water is obtained in this process.
• The synthesis of food takes place in the presence of sunlight.
• Chlorophyll,sunlight,carbon-dioxide and water are necessary to carry out the process of photosynthesis.
• The survival of all living things directly depends on the food made by the plant.
• During the process of photosynthesis oxygen is released and carbohydrate get converted into starch.

MCQ - Science - Class 7 - Chapter 1 - Nutrition in Plants

1. Plants prepare their food by the process of

     a.Respiration

     b.Photosynthesis

c.Transpiration

d.All of these.

  2. The organism that can prepare their own food are called

a. Heterotrophs

b. Consumers

    c. Decomposers

    d. Autotrophs

 3. Which of the following is not required by plant for

food synthesis? 

a.Water

b.Oxygen

  c.Carbon dioxide

     d.Chlorophyll

4. Which one is an insectivorous plant? 

a.Banyan tree

b.Cuscuta

   c.Pitcher plant

  d.Neem plant

5. In the process of photosynthesis, the gas given out

by green leaves is

a.Oxygen

   b.Carbon dioxide

     c.Nitrogen

d.Ozone

6.To test the presence of starch by iodine, the green

leaf is first boiled in alcohol to

     a. Dissolve chlorophyll

  b.Remove starch

 c.Make the leaf soft

 d.Make the leaf transparent

7. Which of the following is an insectivorous plant?

   a.Cuscuta

  b.Croton

  c.Nepenthes

   d.Lichen


8. Plant eating animals are called

 a.Omnivorous

 b.Carnivorous

  c.Herbivorous

 d.Insectivorous

Answer key 

1.b 

2.d

3.b

4.c

5.a

6.a

7.c

8.d

Notes - science - class 7 - chapter 1 - Nutrition in Plants

What is Nutrients?
The components of food such as carbohydrates,protein,fats,vitamins and minerals which are necessary for our body are called Nutrients.

What is Nutrition?
Nutrition is the mode of taking food by an organism and its utilisation by the body.

What is Autotrophic?
The mode of nutrition in which organism make food themselves from simple substances is called autotrophic.
Auto= self; trophos= nourishment;  Therefore.plants are called autotrophs.

What is heterotrophs?
Animals and most other organisms take in ready made food prepared by the plants. they are called heterotrophs. (heteros=other)


What are cells?
The bodies of living organisms are made of tiny units called cells.

What is cell membrane?
The cell is enclosed by a thin outer boundary called the cell membrane.

What is nucleus and cytoplasm?
Most cells have a distinct,centrally located spherical structure called the nucleus.
The nucleus is surrounded by a jelly like substance called cytoplasm.


What is stomata?
The tiny pores that is present on the surface of the leaves called stomata.

What is chlorophyll?
A green pigment, present in all green plants, which is responsible for the absorption of light to provide energy for photosynthesis.

What is photosynthesis?
The process in which plants use to make their food with the help of chlorophyll,sunlight,water and carbon-dioxide to prepare food and release carbohydrate and oxygen.

Algae?
A simple  typically aquatic plant of a large assemblage that includes the seaweeds and many single-celled forms. Algae contain chlorophyll but lack true stems, roots, leaves, and vascular tissue.

Cuscuta?
This is a plant. it does not have chlorophyll. it takes ready made food from the plant on which it is climbing.

  Host?
The plant on which it climbs is called a host.

Parasite?
An organism which lives in or on another organism (its host) and benefits by deriving nutrients from others.

What is insectivorous plant?
A plant that captures and digests insects either passively (as the common pitcher plant or the sundew) or by the movement of certain organs (as the Venus's-flytrap) — are called insectivorous plant.

What is fungi?
Fungi derive nutrition from dead and decaying matter.


What is saprotrophic nutrition?
This mode of nutrition in which organisms take in nutrients in solution form from dead and decaying matter is called saprotrophic nutrition.

Saprotrophs?
Plants which use saprotrophic made of nutrition are called saprotrophs. 

What is symbiotic relationship?
Some organisms live together and share shelter and nutrients.this is called symbiotic relationship. 

What is lichens?
A simple slow-growing plant which typically forms a low crust-like, leaf-like, or branching growth on rocks, walls, and trees.