Tag: biology

Questions Related to biology

Human skeleton has $206$ bones.

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. True

  2. False

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Correct Option: A
Explanation:

Human skeleton is divided into two types based on the planes the bones are present. They are Axial skeleton present in the central plane and Appendicular skeleton i.e., bones present in appendages. The appendicular skeleton of 126 bones and the axial skeleton of 80 bones together form the complete skeleton of 206 bones in the human body. So, the given statement is true.

Yellow bone marrow occurs in medullar cavity of

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Short bones

  2. Spongy bones

  3. Long bones

  4. All the above

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Correct Option: C
Explanation:
  • The central cavity of long bone shafts where red bone marrow and/or yellow bone marrow(adipose tissue) is stored is called the medullary cavity.
  • Hence yellow bone marrow occurs in the medullary cavity of long bones.
  • The amount of yellow bone marrow increases with age.
  • So, the correct answer is 'Long bones'.

Human skeleton altogether contains 206 bones. Some bones are fused in adults, an example of fused bones would be   

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Coccyx

  2. Ear ossicles

  3. Carpals

  4. Metacarpals

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Correct Option: A
Explanation:
  • The coccyx, commonly referred to as the tailbone, is the final segment of the vertebral column in all apes, and analogous structures in certain other mammals.
  •  Depending on an individual's development, the coccyx may consist of three to five different bones connected by fused or semi-fused joints and/or disc-like ligaments.
  •  The individual bones also fuse together to form a single coccyx throughout adulthood. Hence, Human skeleton altogether contains 206 bones. Some bones are fused in adults, an example of fused bones would be  Coccyx.
    • So, the correct answer is 'Coccyx'.

Smallest bone in the body of humans is 

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Incus

  2. Stapes

  3. Malleus

  4. Maxilla

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Correct Option: B
Explanation:

Stapes is the third bone of ear ossicles in the middle ear. It is the smallest bone measuring 3*2.5mm roughly. 

Incus and malleus are the other two ear ossicles in middle ear larger than stapes.
The maxilla is the bone that holds the upper teeth. It is bigger than Stapes.
So the correct option is B.

The parietal bone is an example of which of the following types of bones

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Short

  2. Long

  3. Flat

  4. Irregular

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Correct Option: C
Explanation:

There are flat bones in the skull, the thoracic cage, and the pelvis. The function of flat bones is to protect internal organs such as the brain, heart, and pelvic organs.

So, the correct option is 'flat'.

Which of the following bones are the longest in the body?

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Two fibulas

  2. Two femurs

  3. Two tibias

  4. Two ulnas

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Correct Option: B
Explanation:

The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the tibia and kneecap forming the knee joint. By most measures, the femur is the strongest bone in the body. The femur is also the longest bone in the human body.

So, the correct option is 'Two femurs'.

Ends of long bones are covered with

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. blood cells

  2. muscles

  3. cartilages

  4. ligaments

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Correct Option: C
Explanation:

Ends of long bones are covered with a layer of connective tissue called hyaline cartilage. So, the correct answer is (c).

Haversian canal is present in all of the following except

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Diaphysis (compact) bone of rabbit

  2. Epiphysis (spongy bone) of rabbit

  3. Diaphysis (compact) bone of frog

  4. Both (2) & (3)

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Correct Option: D
Explanation:

Haversian Canals are the features of the compact long bones of mammals. These are centrally located and supply nerves and blood vessels to the osteocytes of bones. The Epiphysis of rabbit and diaphysis of frog do not show the Haversian Canals.

Hence, the correct answer is 'Both (2) and (3)'.

Which of the following statements are incorrect regarding a normal human?
(i) The skull is dicondylic.
(ii) Metacarpals are five in numbers.
(iii) Patella is a cup-shaped bone covering the knee dorsally.
(iv) Scapula is a large triangular flat bale, situated on the ventral side of the thorax.
(v) The pelvic girdle has two coxal bones.

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. (i) and (v)

  2. (i) and (ii)

  3. (ii) and (v)

  4. (iii) and (iv)

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Correct Option: D
Explanation:

Following statements are incorrect regarding a normal human: 

(i) Patella is a cup-shaped bone covering the knee dorsally.
(ii) Scapula is a large triangular flat bone, situated on the ventral side of the thorax.
So, the correct answer (d).

In birds, 6-10 caudal vertebrae are usually fused to form

biology our skeletal system and the skin bones and movements joints in the human body joints

  1. Sesamoid bone

  2. Odontoid process

  3. Plowshare bone

  4. Synsacrum

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Correct Option: D
Explanation:

The body of the bird is adapted for flight. One of the key adaptions for this is the fusing of bones into single ossification.The compound structure present in the birds vertebral column is called the synsacrum and is formed by the fusion of 14 to 16 vertebrae. The last part of the synsacrum is formed by the fusion of the caudal vertebrae