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 types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

Which ones have open circulatory system
1. Ascidia 2. Cockroach 3. Earthworm 4. Prawn 5. Silver Fish 6. Snail 7. Squid.

  1. 2, 4, 6

  2. 1, 2, 4, 6

  3. 3, 4, 5, 7

  4. 2, 4, 5, 6

  5. 1, 2, 4, 6, 7.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Open circulatory systems are characteristic of arthropods (cockroach, prawn, silver fish) and most molluscs (snail). Ascidia (tunicates) and squid (cephalopods) have closed systems.

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

An open circulatory system occurs in the

  1. Reptiles

  2. Birds

  3. Insects

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

An open circulatory system describes a system where blood and interstitial fluid (fluid found between cells in the body) are allowed to mix in an organism. Organisms that have an open circulatory system don't have true blood since it is mixed with other fluids. The blood in these organisms is defined as haemolymph. Two of the largest phyla in the world, arthropoda and mollusca, have an open circulatory system. Arthropods include most insects and sea organisms like crabs and lobsters. Molluscs are organisms with two shells that are hinged together. Examples include clams and oysters. However, not all molluscs have an open circulatory system. Two major members of the mollusc family, octopus and squid, have a closed circulatory system. 

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

Circulatory system in cockroach is 

  1. Open

  2. Closed

  3. Semi-open

  4. Sometimes open and sometimes closed
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Insects have an open circulatory system, which differs in both structure and function from the closed circulatory system found in humans and other vertebrates. In an open system, blood (usually called haemolymph) flows freely within body cavities, where it makes direct contact with all internal tissues and organs.

Multiple choice botany plant breeding plant breeding for disease resistance and insect resistance method of plant breeding for crop improvement plant breeding for food production

Any organism that damages the economic and physical well-being of humans is called

  1. Exoparasite

  2. Commensal

  3. Parasite

  4. Pest
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

competes with humans, domestic animals, or desirable plants for food or An organism should not be considered a pest until it is proven to be one. The economic losses caused by pest damage, if the pest population continued to or component sharing the site usually affect the actions and well-being of many others. So, the correct option is "D" (Pest).

Multiple choice general knowledge our skeletal system and the skin other systems in the body introduction to skeletal system busy at work - our internal organs

Which one of the following carries out the function in human being similar to the one which Malpighian tubules perform in cookroach and other insects ?

  1. Lung

  2. Kidneys

  3. Heart

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

Malpighian tubules are the primary excretory organs in insects, serving a function analogous to the kidneys in humans, which filter waste from the blood.

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

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'.

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

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'