Tag: biology

Quizzes (1160) Questions (12174)

Questions Related to biology

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

Which of the following teeth are absent in a rat?

  1. Canines and molars

  2. Incisors and molars

  3. Incisors and premolars

  4. Canines and premolars
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rats have incisors and molars. Incisors are the foremost teeth in mammals. In rats, there are four, long, sharp front teeth, two on top and two on the bottom. They are specialized for gnawing. Molars are rearmost teeth in the mouth of rat used for grinding food prior to swallowing it. Rats have 12 molars, six on top and six on the bottom. Rats do not have canines (the conical, pointed teeth used for holding prey, defense) or premolars (grinding teeth behind the canines and in front of the molars).
Thus, the correct answer is option D.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

Premolars are absent in

  1. Rat

  2. Elephant

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Elephants have 26 teeth- 2 incisors (known as tusks), 12 deciduous premolars and 12 molars.
Rats have 8 teeth on the lower jaw and 8 on the upper jaw, a total of sixteen teeth which consists incisor, premolar and molar.
Thus, the correct answer is option D.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

In Rabbit and Hare, the incisors of upper and lower jaw halves are

  1. 1 / 1

  2. 2 / 1

  3. 2 / 2

  4. 2 / 0
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The incisors and cheek teeth of rabbits are called aradicular hypsodont teeth. This is sometimes referred to as an elodent dentition. These teeth grow or erupt continuously. The growth or eruption is held in balance by dental abrasion from chewing a diet high in fibre. The anatomic dental formula is 2( i2/1 c0/0 m3/2 )= 16  deciduous teeth.


So, the correct option is '2/1'.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

Dental formula of elephant is

  1. $ \dfrac {1,0,0,3}{0,0,0,3} $
  2. $ \dfrac {1,0,0,3}{1,0,0,3} $
  3. $ \dfrac {1,0,2,3}{1,0,1,3} $
  4. $ \dfrac {2,0,3,3}{1,0,3,3} $
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The dental formula of adult elephants for both species is I 1/0 C 0/0 PM 3/3 M 3/3, with a total number of 26 teeth. The two upper incisors are the tusks.


So, the correct option is 'Option A'.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

Read the following statements and select the correct option.


Statement 1 : Dental formula gives the number of teeth in the half of each jaw.
Statement 2 : Dental formula can be expressed for insectivorous mammals as well as for the non-mammalian vertebrates. 

  1. Both statements 1 and 2 are correct.

  2. Statement 1 is correct but statement 2 is incorrect.

  3. Statement 1 is incorrect but statement 2 is correct.

  4. Both statements 1 and 2 are incorrect.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement 1 is correct as the dental formula represents half of each jaw. Statement 2 is incorrect because dental formulas are specific to mammals and are not typically applied to non-mammalian vertebrates in the same way.

Multiple choice biology digestive system of human buccal cavity digestive system - organs coordination in the process of digestion

Dental formula refers to 

  1. The minimum number of teeth in one half of one jaw

  2. The number of each type of tooth in one half of one jaw

  3. The overall geometric shape of the jaw

  4. Maximum number of teeth in the mouth
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In each set of teeth, incisors (I) are indicated first, canines (C) second, premolars (P) third, and finally molars (M), giving I:C:P:M which is the minimum number of teeth in one half of one jaw. 

So, 'the correct option is 'The minimum number of teeth in one half of one jaw'.