Nutrition in Animals Class 7 Extra Questions and Answers Science Chapter 2 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.
Class 7 Science Chapter 2 Extra Questions and Answers Nutrition in Animals
Extra Questions for Class 7 Science Chapter 2 Nutrition in Animals with Answers
Nutrition in Animals Class 7 Extra Questions Very Short Answer Type
Question 1.
What does animal nutrition include?
Answer:
Animal nutrition includes nutrient requirement, mode of intake of food and its utilisation in the body.
Question 2.
Name the largest gland of the human body.
Answer:
Liver.
Question 3.
What is digestive system?
Answer:
The digestive tract and the associated glands together constitute the digestive system.
Question 4.
Name the four types of teeth.
Answer:
Incisor, canine, premolar and molar.
Question 5.
What is the function of saliva?
Answer:
It breaks down starch into simple sugar.
Question 6.
What is cud?
Answer:
The partially digested food stored in rumen is called cud.
Nutrition in Animals Class 7 Extra Questions Short Answer Type 1
Question 1.
Write the arrangement of teeth in mouth.
Answer:
The arrangement of teeth from left to right is as follows:
3 molars + 2 premolars + 1 canine + 4 incisors + 1 canines + 2 premolars + 3 molars.
Question 2.
What should one do to keep teeth healthy?
Answer:
- One should clean the teeth with a brush or dantun.
- One should use dental floss (a special strong thread which is moved between two teeth to take out trapped food particles) at least twice a day.
- One should rinse the mouth properly after every maeal.
- Also, one should not put dirty fingers or any unwashed object into the mouth.
Question 3.
Draw a diagram to show movement of food in the oesophagus of alimentary canal.
Answer:
Question 4.
What is stomach?
Answer:
The stomach is a thick-walled bag. Its shape is like a flattened U and it is the widest part of the alimentary canal.
Question 5.
What is amoeba?
Answer:
Amoeba is a microscopic single-celled organism usually found in pond water. Amoeba has a cell membrane, a rounded, dense nucleus and many small bubble-like vacuoles in its cytoplasm.
Question 6.
What is alimentary canal?
Answer:
The complete track from mouth to anus through which food is taken, digested, absorbed and undigested food or waste passes out is called alimentary canal.
Nutrition in Animals Class 7 Extra Questions Short Answer Type 2
Question 1.
Name all the parts of alimentary canal.
Answer:
- The buccal cavity
- oesophagus
- stomach
- small intestine
- large intestine and
- the anus.
Question 2.
Draw a diagram of arrangement of teeth in mouth.
Answer:
Question 3.
What is tooth decay?
Answer:
If we do not clean our teeth and mouth after eating, many harmful bacteria also begin to live and grow in it. These bacteria break down the sugars present in the leftover food and release acids. The acids gradually damage the teeth. This is called tooth decay.
Question 4.
Draw a figure of amoeba and show its various parts.
Answer:
Nutrition in Animals Class 7 Extra Questions Long Answer Type
Question 1.
Write the functions of stomach.
Answer:
It receives food from the food pipe or oesophagus at one end and opens into the small intestine at the other.
The inner lining of the stomach secretes mucous, hydrochloric acid and digestive juices. The mucous protects the lining of the stomach. The acid kills many bacteria that enter along with the food and makes the medium in the stomach acidic. The digestive juices break down the proteins into simpler substances called amino acids.
Question 2.
Write briefly about the large intestine.
Answer:
The large intestine is wider and shorter than small intestine. It is about 1.5 metre in length. Its function is to absorb water and some salts fro‘m the undigested food material. The remaining waste passes into the rectum and remains there as semi-solid faeces. The faecal matter is removed through the anus from time- to-time. This is called egestion.
Question 3.
How does nutrition occurs in amoeba?
Answer:
Amoeba feeds on some microscopic organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it. The food becomes trapped in a food vacuole.
Digestive juices are secreted into the food vacuole. They act on the food and break it down into simpler substances. Gradually the digested food is absorbed. The absorbed substances are used for growth, maintenance and multiplication. The undigested residue of the food is expelled outside by the vacuole.
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