Class 7 Science Chapter 2 MCQ for 2020-21
| Class: | 7 |
| Subject: | Science |
| Contents: | Multiple Choice Questions – MCQ Tests |
Class 7 Science Chapter 2 MCQ for Exams
Class 7 Science Chapter 2 MCQ are given below with answers and explanation. Attempt at least 5 tests to test your exam preparation based on Class 7 Science Chapter 2. There are 24 sets of MCQ tests for practice containing more than 120 questions. These test will provide a complete revision for second chapter of grade 7 science.
Q1
In which of the statements is or are incorrect, about eating habits of animals?
[A]. Animals that obtain their food by killing other animals, called scavengers.
[B]. Organisms that obtain their food from other animals either by living inside or outside their body, called parasite.
[C]. Animals that consume plants as well as other animals as their food, called omnivorous.
[D]. Animals that obtain their food only from plants, called herbivorous.
Answer: Option A
Explanation:Animals that obtain their food by killing other animals, called carnivorous and animals which feed on the remains of dead animals preyed by predators, called scavengers.
Q2
The enzymes present in the saliva convert
[A]. Fats into fatty acids and glycerol.
[B]. Starch into simple sugars.
[C]. Proteins into amino acids
[D]. Complex Sugars into simple sugars
Answer: Option B
Explanation:The salivary gland present in mouth secretes saliva. It contains the enzyme amylase (ptyalin) that breaks down into simple sugars. Only about 30% starch digestion takes place in the mouth.
Q3
Paheli wants to know the name of the teeth, which helps to “piercing and tearing” the food?
[A]. Molar
[B]. Premolar
[C]. Incisors
[D]. Canines
Answer: Option D
Explanation:The canines are situated at the ‘corners’ of the dental arches. They have a sharp, pointed biting surface. Their function is to grip and tear food. There are four canine teeth.
Q4
In which of the statements is or are incorrect, about eating habits of animals?
[A]. Animals that obtain their food by killing other animals, called scavengers.
[B]. Organisms that obtain their food from other animals either by living inside or outside their body, called parasite.
[C]. Animals that consume plants as well as other animals as their food, called omnivorous.
[D]. Animals that obtain their food only from plants, called herbivorous.
Answer: Option A
Explanation:Animals that obtain their food by killing other animals, called carnivorous and animals which feed on the remains of dead animals preyed by predators, called scavengers
Q5
Read the following sentences and choose which of the statement is or are incorrect?
[A]. The liver is situated in the upper part of the abdomen on the left side.
[B]. The stomach is situated in the middle part of the abdomen on the right side.
[C]. The pancreas is a cream coloured gland located just below the liver.
[D]. All the above
Answer: Option D
Explanation:The liver is situated in the upper part of the abdomen on the “right side”. The stomach is situated in the middle part of the abdomen on the “left side”. The pancreas is a cream coloured gland located just below the “stomach”.
Q6
What do you mean by “salivary digestion”?
[A]. When fats breakdown into fatty acids and glycerol, called salivary digestion.
[B]. When proteins breakdown into amino acids, called salivary digestion.
[C]. When cud returns to the mouth in small lumps and the animal chews it, called salivary digestion.
[D]. None of the above.
Answer: Option D
Explanation:The food enters into the buccal cavity through mouth. It is chewed by the teeth and mixed with saliva. Saliva contains and enzyme called ptyalin (salivary amylase) which converts complex carbohydrates like starch into sugars. That is why the bread taste become sweet after chewing. This type of digestion is called salivary digestion.
Q7
They are given some parts of the digestive system, choose the odd one
[A]. Oesophagus
[B]. Small intestine
[C]. Large intestine
[D]. Rectum
Answer: Option B
Explanation:Small intestine is the odd one. It releases intestinal juices and is involved in digestion. All others do not take part in the digestion process.
Q8
Boojho wants to know the name of insects which has piercing and sucking mouth parts that pierce food items to enable sucking of internal fluids?
[A]. Mosquito
[B]. Housefly
[C]. Cockroach
[D]. Ant
Answer: Option A
Explanation:The mosquito’s mouth, also called a “proboscis”, isn’t just one tiny spear. It’s a sophisticated system of six thin, needlelike mouthparts that scientists call “stylets”. Each of which pierces the skin, finds blood vessels and makes it easy for mosquitoes to suck blood. (Note: Only female mosquitoes drink blood is so that they can nourish their child-bearing bodies. Blood is full of proteins and amino acids, which makes it the perfect prenatal supplement for growing mosquito eggs, which is why only female mosquitoes drink blood)
Q9
Which of the following statements is or are incorrect, about “human digestive system”?
[A]. Food is pushed into the stomach by the peristaltic movement.
[B]. In humans, the small intestine is about 6 metre and large intestine is about 1.5 metre long.
[C]. The villi increase the surface area for absorption of the digested food.
[D]. None of the above.
Answer: Option D
Explanation:Here, all the statements are correct. Hence, your answer will be option [D].
Q10
Read the statement and choose a word for it: “Organisms which take food hurriedly and store it, in a part of the stomach. This digested food is returned to the buccal cavity for the complete process of digestion”.
[A]. Cattles
[B]. Omnivores
[C]. Beetles
[D]. Carrion feeders
Answer: Option A
Explanation:Cows, buffaloes and other grass-eating animals (cattle) chewing continuously. Actually, they quickly swallow the grass and store it, in a part of the stomach, called “rumen”. But later the partially digested food (cud) returns to the mouth in small lumps and the animal chews it. This process is called rumination and these animals are called ruminants.
What are the different parts of Human Digestive System?
Human digestive system consists of mouth, oesophagus, stomach, small intestine, large intestine, rectum and anus.
How many type of teeth are there in Human being?
There are four types of teeth found in human being. These are incisors, canines, premolars and molars.
Where is the digested food absorbed in Human being?
The digested food is absorbed at illum of small intestine by finger like structures called villi.
What is absorbed in large intestine?
In large intestine, most of the water is reabsorbed.
True or False Questions
1. Parasites are Autotrophs.
2. Amoeba ingest food by Pseudo podia.
3. Milk teeth are replaced by permanent teeth in human.
4. Nutrition is not necessary for all organisms.
5. Large intestine is the longest part of digestive system of human.
6. Digestion of food starts from mouth.
7. A butterfly uses its feeding tube to suck nector from flowers.
8. Ruminants have four chambers of stomach.
Answers of True or False Questions
1. False
2. True
3. True
4. False
5. False
6. True
7. True
8. True
