Tag: zoology

Quizzes (289) Questions (5869)

Questions Related to zoology

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

A biology student has to distinguish the anterior and posterior end of Pheretima morphologically. For it, he can observe/ locate

  1. Parapodia

  2. Eyes

  3. Clitellum

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

The anterior region of Pheretima consists of a thick, saddle-like ring found in the epidermis known as Clitellum This structure is easily visible with naked eyes hence a person can easily distinguish the anterior and posterior end of pheretima.

So the correct answer is 'Clitellum'.

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

Which of the following statements is not correct regarding sexuality in organisms?

  1. When both male and female flowers are present on the same plant, the condition is said to be monoecious and is present in cucurbits and coconuts

  2. When both male and female flowers are present on the separate plants, the condition is said to be dioecious and is present in papaya and date palms

  3. In earthworm, both male and female sex organs are present in the same individual and therefore, self-fertilisation occurs in them

  4. Cockroach is an unisexual animal and exhibit sexual dimorphism
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cross-fertilization occurs in many hermaphrodite animals as in earthworm. It is due to the fact that their male and female reproductive organs mature at different times.

Thus, the correct answer is 'In earthworm, both male and female sex organs are present in the same individual and therefore, self-fertilization occurs in them.'

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

One of the following is wrong about male reproductive organs of earthworm

  1. Two fluid-filled testis sacs with pair of spermiducal funnel attached to vasa differentia

  2. Two pairs of seminal vesicles

  3. Four pairs of spermathecae

  4. One pair of prostate gland

  5. All of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation
Earthworm is a hermaphrodite i.e. ovaries and testes are present in the same individual. There are two pairs of testes present in the 10th and 11thsegments. Testes are enclosed by a fluid-filled sac called testes sac. Testis sec with the pair of a funnel attached to the vasa deferentia, which run up to the 18th  segment where they join the prostatic duct. In the earthworm reproductive system, four pairs of spermathecae, two pairs of seminal vesicles and one pair of the prostate gland are present.
So, 'All of the above'

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

Larva is not found in the life of 

  1. Pheretima

  2. Taenia

  3. Musca

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

In Pheretima, a cocoon contains many fertilised eggs but only one embryo completes development, while other ova serve as nurse cells. The development is direct without a free larval stage. After the development of 2-3 weeks, the young worm crawls out of the cocoon. So, the correct answer is option A.

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

In earthworm, the process of spermatogenesis takes place in 

  1. Spermatheca

  2. Testis

  3. Testis sac

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

There are two pairs of testes, which are situated in the 10$^{th}$ and 11$^{th}$ segments on each side of the alimentary canal. The germinal epithelium of the testis gives rise to the sperm cells by spermatogenesis. So, the correct answer is option B.

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

Which of the following is marine leech?

  1. Haemadipsa

  2. Bonellia

  3. Hirudinaria

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Leech belongs to phylum Annelida. The 'green spoonworm' (Bonellia viridis) lives in a marine habitat. It shows sexual dimorphism. It is also known as the biocidal properties of a pigment in its skin. It is found in the north-eastern Atlantic, Indian and Pacific Oceans and the Mediterranean and Red seas. It is pale- to dark-green in colour, with a 15 cm long, round or sausage-shaped body. Hence, option B is correct.

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

In Earthworm, ovary is situated in segment

  1. 13

  2. 9

  3. 10

  4. 26
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Earthworms are hermaphrodites; that is, they have both male and female sexual organs.  The two or four pairs of seminal vesicles produce, store and release the sperm via the male pores. Ovaries and oviducts are in segment 13 release eggs. Ovarian funnels are present beneath the ovaries which continue into the oviduct, join together.

So the correct answer is '13'.

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

Spermathecae occur in earthworm in

  1. 6th-9thsegments

  2. 6th-10th segments

  3. 6th-11th segments

  4. 5th-8th segments
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The spermathacae are also called as receptaculum seminis. species of earthworms have four pairs of spermathecae one pair each in the 6th, 7th, 8th, and 9th segments. The spermathecae receive and store the spermatozoa of another earthworm during copulation. They are lined with epithelium and are variable in shape: some are thin, heavily coiled tubes.

So the correct answer is '6th - 9th segments'.

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

Which one correctly describes the location of body parts in Pheretima?

  1. Two pairs of accessory glands in 1618 segments

  2. Two pairs of testes in 10th and 11th segments

  3. Four pairs of spemathecae in 47 segments

  4. One pair of ovaries attached over septum 1415 segments
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Two pairs of accessory glands are present in 17th and 19th segments. 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.

Two pairs of testes are present on the 10th and 11th segments.
So the correct answer is 'Two pairs of testes in 10th and 11th segments'.

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

Choose the correct answers from the alternatives given.
Flukes and tapeworms:

  1. show cephalization

  2. have well-developed reproductive systems

  3. have well-developed nervous systems

  4. have a tube-within-a-tube body plan
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Tapeworm and fluke worms belong to class Platyhelminthes. They both are having well developed reproductive systems.

So the correct answer is "have well-developed reproductive systems".