Tag: locomotion and reproduction

Questions Related to locomotion and reproduction

Doublet fibrils of a cilium or flagellum are tilted at an angle of

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. $5^o$

  2. $10^o$

  3. $15^o$

  4. $20^o$

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Correct Option: B

Flagella occur in

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Eukaryotic cell

  2. Prokaryotic cell

  3. Viruses

  4. Both A and B.

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Correct Option: D

Axoneme with 9+2 microtubular arrangement occurs in

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Cilia

  2. Flagella

  3. Both A and B

  4. Centriole

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Correct Option: C
Explanation:
  • Axoneme with 9+2 microtubular arrangement occurs in both cilia and flagella.
  • Cilia and flagella are cellular projections which are covered by an extension of the plasma membrane. 
  • They both have similar internal structures and are made up of microtubules.
  • The microtubule arrangement within cilia and flagella is 9 + 2 arrangement of microtubules.
  • It contains nine fused pairs of microtubules on the outer side of a cylinder and the two unfused microtubules at the centre.
  • So, the correct answer is 'Both A and B'.

Tubulin occurs in

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Microtubules

  2. Cilia and flagella

  3. Microvilli

  4. Both (A) and (B)

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Correct Option: D
Explanation:

Tubulin belongs to the protein superfamily of globular proteins.Alpha and beta tubulins polymerize into microtubules. Microtubules function in many processes like structural support, intracellular transport, and DNA segregation. Microtubules emerge from microtubule organizing center in eukaryotic cells.

Cilia and flagella contain the motor protein dynein and microtubules, in the form of two central and nine doublets surrounding it.Cilia and flagella help in locomotion in unicellular eukaryotes.
Microvilli are cellular membrane protrusions that increase the surface area for diffusion.
Therefore option D is correct.

Calcium dependent kinases can control _______________.

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Cell cycle activities

  2. DNA replication

  3. Cell surface receptors

  4. Mambrane structure

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Correct Option: A

Cilia are

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Short, 5-10 $\mu m$

  2. Numerous

  3. With sweeping or pendular movement

  4. All the above.

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Correct Option: D

A flagellum beats

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Independently, undulatory and asymmetrically

  2. Independently, undulatory and symmetrically

  3. Coordinated, pendular and symmetric

  4. Coordinated, pendular and asymmetric.

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Correct Option: B

A cilium beats

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Asymmetrically by sweeping action

  2. Symmetrically by sweeping action

  3. Symmetrically by undulatory action

  4. Asymmetrically by undulatory action

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Correct Option: A
Explanation:
  • Cilia can be defined as the tiny hair-like projections on the surface of the cell.
  • These hair-like projections help in sweeping mucus, trapped dust and bacteria in the respiratory tracts.
  • It beats asymmetrically by the sweeping action
  • The asymmetrical beating pattern consists of two strokes- effective stroke and recovery stroke.
  • In an effective stroke, the cilia are straight and generate flow in the same direction as its motion.
  • Whereas, in recovery stroke, the cilia bend parallel to the surface and creates relatively weaker backward flow.
  • So, the correct answer is 'Asymmetrically by sweeping action'.

Axoneme is a structure associated with

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Golgi bodies

  2. Only cilia

  3. Only flagella

  4. Both cilia and flagella

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Correct Option: D
Explanation:
Axoneme is the central strand of a cilium or flagellum. It is composed of an array of microtubules, typically in nine pairs around two single central ones.Cilia and flagella is made of the axoneme which is composed of microtubules and their associated proteins.

So, the correct answer is 'D'.

Movement of cilia and flagella is due to presence of

zoology locomotion and reproduction flagella other cell components single membrane bound organelles

  1. Central sheath

  2. Dynein

  3. Radial spokes

  4. Singlet tubules.

Show answer
Correct Option: B
Explanation:

Dynein is a family of cytoskeletal motor proteins that move along microtubules in cells. They convert the chemical energy stored in ATP to mechnical work, and hence are involved in movement of cilia and flagella.

So, the correct option is 'Dyenin'.