Tag: earthworm - reproductive system

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Questions Related to earthworm - reproductive system

Multiple choice evs seed becomes plant introduction to reproduction vegetative reproduction budding, vegetative propagation and spore formation earthworm - reproductive system reproduction in earthworm other modes of vegetative propagation the journey of seeds

Read the assertion (A) and reason (R) carefully to mark the correct option out of the options given below:
A. There are some plants which have in their life-cycles neither the process of fertilization nor they have meiosis.
R. In these plants, the vegetative or somatic plant body helps in the propagation of the plant.

  1. Both the Assertion and the Reason are true and the reason is a correct explanation of the assertion.

  2. Both the Assertion and Reason are true but the reason is not a correct explanation of the assertion.

  3. The Assertion is true but the Reason false.

  4. Both the Assertion and Reason are false.

  5. The assertion is false but reason is true.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Organisms reproduce for perpetuation of species because individuals have a limited life span. Organisms may reproduce sexually as well as asexually. The sexual reproduction involves formation of haploid gametes through the process of reduction division or meiosis. The haploid gametes fuse during fertilization to form diploid zygote. Thus, restoring the normal ploidy. The asexual reproduction does not involves gamete formation through meiosis or their fertilization. The vegetative propagation in plants is a type of asexual reproduction in which plant body is propagated directly from some vegetative part of adult plant.

Therefore, the correct answer is option A.

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

Number of ovaries present in earthworm is

  1. One

  2. Two

  3. Four

  4. Eight
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The number of ovaries present in Earthworm is one pair of ovaries. One pair of ovaries is attached at the intersegmental septum of the 12th and 13th segments. Ovarian funnels are present beneath the ovaries which continue into the oviduct and open on the ventral side.

So the correct answer is "Two".

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

In earthworms, self fertilization does not occur due to 

  1. Protandry

  2. Protogyny

  3. Both A and B

  4. Dichogamy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Earthworms are monoecious or hermaphrodite (have both male and female sex organs) but are protandrous. The testes mature earlier than ovaries and hence, self-fertilisation is avoided.
Thus, the correct answer is option A.

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

Number of testes in Earthworm is

  1. One

  2. Two

  3. Four

  4. Eight
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Earthworm is hermaphrodite. There are two pairs of testes present in the 10th and 11th segments. Their vasa deferentia run up to the 18th segment where they join the prostratic duct. The prostate and spermatic duct open to the exterior by a pair of male genital pores on the ventrolateral side of the 18th segment. 

So the correct answer is "Four".

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

The female genital aperture, in earthworm is present ventrally on the segment

  1. 10th

  2. 12th

  3. 14th

  4. 18th
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Four pairs of spermathecae are located in 6th-9th segments. They receive and store spermatozoa during copulation. One pair of ovaries is attached at the inter-segmental septum of the 12th and 13th segments. Ovarian funnels are present beneath the ovaries which continue into the oviduct, join together and open on the ventral side as a single median female genital pore on the 14th segment.

So the correct answer is '14th'.

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'.