Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

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

Spermathecae of Earthworm

  1. Store sperms

  2. Produce sperms

  3. Activate sperms

  4. Bring about fertilization
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

In Earthworm male genital apertures are present ventrally in the segment

  1. 14th

  2. 15th

  3. 17th

  4. 18th
Reveal answer Fill a bubble to check yourself
D Correct answer
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'.

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

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

  1. Pheretima posthuma

  2. Asterias

  3. Musca domestica

  4. Butterfly
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

Spermathecae of earthworm take part in

  1. Collection of sperms of other animal

  2. Collection of sperms of the same animal

  3. Sperm maturation

  4. Fertilisation
Reveal answer Fill a bubble to check yourself
A Correct answer
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'. 

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

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In earthworms, the male genital pores are located on the 18th segment, not the 9th segment.

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

Female genital aperture in earthworm is found in 

  1. 10$^{th}$ segment
  2. 12$^{th}$ segment
  3. 14$^{th}$segment
  4. 18$^{th}$segment
Reveal answer Fill a bubble to check yourself
C Correct answer
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.'.

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

Earthworms are hermaphrodite and reproduce primarily by

  1. Self-fertilization

  2. Cross-fertilization

  3. Asexualy

  4. All of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

Nutritive substance for cocoon secreted by

  1. Mucous cells

  2. Albuminous cells

  3. Yellow cells

  4. All of these
Reveal answer Fill a bubble to check yourself
A Correct answer
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'.

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

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

  1. Dorsal blood vessels

  2. Genital pores

  3. Absence of setae

  4. Parapodia
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.