Tag: zoology

Questions Related to zoology

Spermathecae of Earthworm

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Store sperms

  2. Produce sperms

  3. Activate sperms

  4. Bring about fertilization

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Correct Option: A
Explanation:

In Earthworm there are four pairs of spermathecae which are located in the 6th - 9th segments one pair in each segment. They receive and store spermatazoa during copulation. One pair of ovaries is attached at the inter-segmental septum of the 12th and 13th segments.

So the correct answer is 'Store sperms'.

In Earthworm male genital apertures are present ventrally in the segment

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. 14th

  2. 15th

  3. 17th

  4. 18th

Show answer
Correct Option: D
Explanation:

A pair of male genital pores is present on the ventrolateral sides of the 18th segment. Numerous minute pores called nephridiopores open on the surface of the body. In each body segment, except the first, last and clitellum, there are rows of S-shaped setae, embedded in the epidermal pits in the middle of each segment.

So the correct answer is '18th'.

The animal which does not show any metamorphosis or larval stage is

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Pheretima posthuma

  2. Asterias

  3. Musca domestica

  4. Butterfly

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Correct Option: A
Explanation:

Asterias, Musca domestica and butterfly include a larval stage in their life cycle. Whereas in the case of Pheretima, there is no larval stage involved and the development is direct mode of development.

So, the correct answer is 'Pheretima posthuma'.

Copulation period of Earthworm is

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. One hour

  2. Two hours

  3. Four hours

  4. About one week

Show answer
Correct Option: A
Explanation:

Answer is option A i.e. "One hour"
Copulation lasts for about an hour. Then the worms separate and later (after some day) they lay their eggs in cocoon. Cocoon formation takes place after copulation, when ovaries mature.

Spermathecae of earthworm take part in

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Collection of sperms of other animal

  2. Collection of sperms of the same animal

  3. Sperm maturation

  4. Fertilisation

Show answer
Correct Option: A
Explanation:

Spermathecae, which are four pairs are arranged one each in 6,7,8 and 9 th segments. Spermathecae are also called as seminal receptacles as they store spermatozoa from another worm  in the diverticular region during copultion. The ampulla of spermathecae nourish the sperms.

So, the correct answer is 'Collection of sperms of other animal'. 

Choose the wrongly matched pair regarding the position of reproductive structures in earthworm.

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Testes 10th and 11th segments

  2. Spermathecae 6th to 9th segments

  3. Male genital pore 9th segment

  4. Female genital pore 14th segment

  5. Ovaries intersegmental septum of 12th and 13th segment

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Correct Option: C

Female genital aperture in earthworm is found in 

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. 10$^{th}$ segment

  2. 12$^{th}$ segment

  3. 14$^{th}$segment

  4. 18$^{th}$segment

Show answer
Correct Option: C
Explanation:

The oviduct funnel located below ovary opens into a short conical tube called oviduct. Two oviducts fuse together and open outside through female genital aperture located in the 14$^{th}$ segment.

So, the correct option is '14$^{th}$ segment.'.

Earthworms are hermaphrodite and reproduce primarily by

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Self-fertilization

  2. Cross-fertilization

  3. Asexualy

  4. All of the above

Show answer
Correct Option: B
Explanation:

Earthworms are hermaphrodites but they cannot fertilize their own eggs because of their relative position of male and female genital aperture and they are protrandous (i.e. male sex mature earlier than female gametes). So, cross-fertilization takes place instead of self-fertilization.

So, the correct option is 'Cross-fertilization'.

Nutritive substance for cocoon secreted by

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Mucous cells

  2. Albuminous cells

  3. Yellow cells

  4. All of these

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Correct Option: A
Explanation:

The clitellum plays an important role in reproduction. Its glands produce mucous which becomes a sheath containing nutritive material. The sheath slides forwards, collecting eggs and sperm from the genital openings of the worm. The sheath finally slides off from the head of the worm. As it separates from the worm, its ends are sealed. It now becomes a cocoon.

So, the correct option is 'Mucous cells'.

In Pheretima, the dorsal surfaces is marked by a mid dorsal line, whereas the ventral surface is distinguish the present of

zoology earthworm earthworm - reproductive system reproduction in earthworm introduction to reproduction

  1. Dorsal blood vessels

  2. Genital pores

  3. Absence of setae

  4. Parapodia

Show answer
Correct Option: B
Explanation:

Genital pores for both male and female organs are present on the ventral side of the earthworm. Also, setae are present on the ventral side.

So, the correct option is 'Genital pores'.