Tag: biology

Questions Related to biology

Which one of the following is not a bone of the human leg?

biology body movements basics of joints joints and type of joints skeleton, joints and muscles

  1. Fibula

  2. Femur

  3. Humerus

  4. Tibia

Show answer
Correct Option: C
Explanation:

The humerus is the long bone in the upper arm. It is located between the elbow joint and the shoulder. So, the correct option is C.( Humerus )

 Ribs protect the 

biology body movements basics of joints joints and type of joints skeleton, joints and muscles

  1. Lungs

  2. Brain

  3. None of the above

  4. All of the above

Show answer
Correct Option: A
Explanation:

Ribs serve to protect the lungs, heart, and other internal organs of the thorax. In some animals, especially snakes, ribs may provide support and protection for the entire body.

Therefore, the correct answer is option A.

Major functions of skeleton are

biology body movements basics of joints joints and type of joints skeleton, joints and muscles

  1. Support

  2. Protection

  3. Storage of ions

  4. All of the above

Show answer
Correct Option: D
Explanation:

The skeleton serves a number of functions in vertebrates:

(1) The skeleton forms a rigid framework, which gives support to the body against gravity.
(2) The skeleton encloses the more vital organs of the body to protect them from injury.
(3) Bones contain deposits of calcium phosphate and calcium carbonate. These may be released into the blood if needed for use elsewhere in the body, but are later replaced. This helps in regulating calcium and phosphorus level of blood. 
So, the correct answer is option D.

The brain is protected by the 

biology body movements basics of joints joints and type of joints skeleton, joints and muscles

  1. Vertebrae

  2. Cranium

  3. Ribs

  4. Sternum

Show answer
Correct Option: B
Explanation:

  • The skull is composed of two parts: the cranium and the mandible.
  •  In the human, cranium has two parts the neurocranium and the viscerocranium. 
  • The neurocranium forms the cranial cavity that surrounds and protects the brain and brainstem. 
  • The neurocranium consists of the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid, and frontal bones—all are joined together with sutures. Hence, The brain is protected by the Cranium.
So, the correct answer is 'Cranium'.

The method of reproduction in unicellular organisms like amoeba and bacteria in which they split into two equal halves and produce new ones is called ............

biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

  1. Fragmentation

  2. Binary fission

  3. Budding

  4. Spore formation

Show answer
Correct Option: B
Explanation:

In binary fission, parent cell divides into two equal halves called daughter cells. Daughter cells are identical to each other and to their parent cell. Organisms like the amoeba, bacteria, euglena, etc. exhibit binary fission. During multiple fission, the organism divides itself into numerous daughter cells.

So, B is the correct option.

In animal cells, cytokinesis involves 

biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

  1. Separation of sister chromatids

  2. Contraction of ring of microfilaments

  3. Depolymerisation of kinetochore microtubules

  4. Protein kinase that phosphorylates other enzymes

Show answer
Correct Option: A

In animal cytokinesis, cleavage occurs with the help of

biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

  1. Microtubules

  2. Spindle fibres

  3. Microfibrils

  4. Microfilaments

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Correct Option: D

Cytochalasin B is a drug isolated from moulds. It blocks the formation of contractile microfilaments. Which of the following aspects of the cell cycle would be most disrupted due to this ?

biology structure of chromosome, cell cycle and cell division cell division in embryo development mitosis division for growth and reproduction

  1. Cleavage furrow formation

  2. Attachment of kinetochore to spindle fibres

  3. Spindle fibre formation

  4. Cell elongation during anaphase

Show answer
Correct Option: C
Explanation:

Spindle formation is mainly done by centrioles. It helps in separation of chromosomes during cell division. Cytochalasin B is a cell-permeable mycotoxin. It inhibits cytoplasmic division by blocking the formation of contractile microfilaments due to which cell is unable to maintain the desired number of chromosomes and leads to numerical abberations.

The bats are able to fly in dark since their mouth produce?

biology environmental science plant adaptation adaptation in plants plant habitat

  1. Sound waves

  2. Ultrasonic waves

  3. Infrared rays

  4. Ultraviolet rays

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Correct Option: A

The bats are able to fly in dark since their mouth produce

biology environmental science plant adaptation adaptation in plants plant habitat

  1. Sound waves

  2. Ultrasonic waves

  3. Infrared rays

  4. Ultraviolet rays

Show answer
Correct Option: B
Explanation:
Every night a bat puts in 600-700 kilometres of airtime. Flying low, the animals catch insects at speeds of around 40 metres per second. At night the bat uses its hearing to navigate its way to prey. Bats catch insects continuously using echolocation, an advanced navigation system. The bat emits ultrasonic waves with very high frequencies. Its calls are pitched at 20-100 kilohertz, a frequency that is too high-pitched for humans to hear naturally. Their sounds are reflected in the environment, hitting various objects and returning to the bat as echoes. The echo signals enable the bat to form a mental map of its surroundings.
So the correct option is 'ultrasonic waves'.