Biology

Invertebrate Zoology

799 Questions

Invertebrate zoology covers the anatomical and physiological characteristics of animals without backbones, focusing heavily on insects, earthworms, and other arthropods. These questions explore structural components like respiratory organs and excretory systems. This topic forms a crucial part of the biology section in various competitive exams.

Cockroach anatomyEarthworm organsInsect ordersRespiratory organsExcretory organs

Invertebrate Zoology Questions

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Select the correct option:

On very special feature in the earthworm is that:

  1. fertilization of eggs occurs inside the body

  2. the typhlosole greatly increases the effective absorption area of intestine

  3. the S-shaped setae embedded in the integument are the defensive weapons used against the enemies

  4. it has a long dorsal tubular heart.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

From 27th segment upt 23-25 segments in front of the anus in intestine of earthworm, lies a highly glandular and vascular part called typhosole. It greatly increases the effective absorption area for digested food in the intestine.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

The type of syngamy in Trichonympha is

  1. Hologamy

  2. Anisogamy

  3. Isogamy

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

The process of fusion between the haploid male nucleus and egg nucleus is known as amphimixis. It is also known as syngamy. It leads to the formation of a diploid zygote. The form of sexual reproduction in which the gametes are of the same size and structure as the somatic cells. Trichonympha lives in the intestine termite species and helps them to break the cellulose which they take from the wood. They produce similar haploid gametes known as zooflagellates so it is classified as hologamy.

So, the correct answer is option A.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Select the wrong statement

  1. Isogametes are similar in structure, function and behavior

  2. Anisogametes differ either in structure, function and behavior

  3. In oomycetes female gamete is smaller and motile, while male gamete is larger and non-motile

  4. Chlamydomonas exhibits both isogamy and 1, anisogamy and Fucus shows oogamy
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

  • An isogamete is a gamete that is indistinguishable in size and form from the other gametes. The sex i.e, the male and female have also exhibited no difference.  It is found in algae and fungi. 

So, the correct option is 'Isogametes are similar in structure, function, and behavior'.

Multiple choice botany modes of reproduction fertilization in organisms sexual reproduction in organisms reproduction in organisms

Select the wrong statement :

  1. Chlamydomonas exhibits both isogamy and anisogamy and Fucus shows oogamy.

  2. Isogametes are similar in structure, function and behaviour.

  3. Anisogametes differ either in structure, function or behaciour.

  4. In oomycetes, female gamete is smaller and motile while male gamete is larger and non-motile.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In oomycetes, sexual reproduction involves oogamy where the female gamete is large and non-motile (an egg), while the male gamete can be smaller and motile (flagellated). Therefore, statement D incorrectly claims that the female gamete is smaller and motile while the male gamete is larger and non-motile.

Multiple choice biology food and human health effect on general health growth and development in young people nutrient deficiency diseases

The hexacanth larva of Taenia solium occurs in a 3 layered structure referred to as _______

  1. Proglottid

  2. Onchosphere

  3. Gravid proglottid

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

Each segment in the strobila of tapeworm, containing a complete sexually mature reproductive system is proglottid.

So, the correct option is 'Proglottid'.

Multiple choice zoology environmental science structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Find out the wrongly matched pair.

  1. Nephridia - Earthworms - help to remove nitrogenous wastes and maintain ionic balance

  2. Malpighian tubules - insects including cockroaches - help in the removal of nitrogenous wastes and osmoregulation

  3. Antennal glands or green glands - excretory organ in the abdominal part of crustaceans like prawns - perform the excretory function

  4. Protonephridia - Rotifers - primarily concerned with ionic and fluid volume regulation
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Earthworm respires by

  1. Clitellum

  2. Ctenidia

  3. Moist skin

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

Respiration takes place through the moist surface of the body of an earthworm. Moist surface aids in easy diffusion of gases. Haemoglobin is the respiratory pigment that helps in transportation of oxygen to different parts of the body. 

Clitellum is the glandular and non-segmented region in the body of an earthworm and is helpful in copulation. 
Ctenidia is the respiratory organ present in molluscs and some insects. 
Typhlosole is a part of the digestive system of an earthworm and increases the absorption and digestion region in the alimentary system.
So, the correct answer is option C.

Multiple choice zoology environmental science structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

In earthworm, pharyngeal, nephridia are present as three paired tuffs in the segments.

  1. $3$rd, $4$th and $5$th
  2. $4$th, $5$th and $6$th
  3. $5$th, $6$th and $7$th
  4. $6$th, $7$th and $8$th
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In earthworms, pharyngeal nephridia are segmentally arranged excretory organs that occur as three paired tufts of nephridia situated in the 4th, 5th, and 6th segments.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Earthworm moves with the help of

  1. Muscles

  2. Setae

  3. Parapodia

  4. Setae and muscles
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Earthworm is able to move with the help of combined efforts of muscles and setae. Both of them help in longitudinal and circular movement of the muscles. The coelomic fluid acts as a hydraulic skeleton in the body of an earthworm. It helps to provide stiffness to the body and relaxation of the muscles. Thus option D is correct. 

Parapodia is the organ present in polychaetes, marine worms and is helpful in their locomotion. It is absent in earthworms. So, the correct answer is option D.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Earthworm is

  1. Nocturnal

  2. Diurnal

  3. Aquatic

  4. All the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Earthworm is a reddish brown terrestrial invertebrate that inhabits the upper layers of the moist soil rich in decaying matter. It is nocturnal and during the daytime, it lives in burrows made by boring and swallowing the soil.

So the correct answer is 'Nocturnal'.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Dorsal pores of earthworm are meant for passage of

  1. Coelomic fluid

  2. Blood

  3. Waste materials

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

Dorsal pores of Earthworm are meant for passage of coelomic fluid which is milky in color and consists of plasma and four types of nucleated corpuscles, namely, phagocytes, nucleated cells, monocytes, and chloragogen cells. When the worm burrows in soil, its posterior muscles contract, forcing the coelomic fluid towards the anterior end.  The anterior end grips the substratum and setae act as anchors on the soil and then the earthworm moves.

So the correct answer is "Coelomic fluid".

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

The segment of earthworm in which mouth is situated is called

  1. Prosoma

  2. Prostomium

  3. Peristomium

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

  • Earthworm lack distinct head. The first segment at the anterior end of the body is called peristomium or buccal segment which bears crescentic mouth.
  • Peristomium bears a fleshly lobe-like structure called prostomium which hangs over the mouth ventrally. 
So, the correct option is 'Peristomium'.

Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

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

  1. Testes - 10$^{th}$ and 11$^{th}$ segments
  2. Spermathecae - 6$^{th}$ to 9$^{th}$ segments
  3. Male genital pore - 9$^{th}$ segment
  4. Ovaries - Inter segmental septum of 12$^{th}$ and 13$^{th}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

1. Testes are in two pairs, white and lobed, located in 10th and 11th segment.

2. Spermathecae are in 4 pairs in each of 6$^{th}$, 7$^{th}$, 8$^{th}$, 9$^{th}$ segment and they store spermatozoa during copulation.
3. Male genital pore is found in one pair located in 18$^{th}$ segment. Sperm produced in the testes is pass out through male genital pore.
4. A pair of small, whitish and lobulated ovaries are located in inter segmental septum of 12$^{th}$ and 13$^{th}$ segments, on either side of ventral nerve cord.
So, the correct option is 'Male genital pore - 9$^{th}$ segment'.