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

Earthworm has around ............ segments on its body.

  1. 60 to 100

  2. 100 to 120

  3. 120 to 140

  4. More than 140
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Earthworm (Pheretima) belongs to order Haplotaxiada of class Oligochaeta under the phylum Annelida. The body of earthworm is rounded and divided into a number of segments. There are around 100 to 120 segments on the body of earthworm.
So, the correct answer is '100 to 120'.
Multiple choice zoology earthworm structure of earthworm earthworm - morphology, integumentary system , respiration and nervous system adaptations

Earthworm is

  1. Ureotelic

  2. Ammoneotelic

  3. Uricotelic

  4. Both (1) and (2)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Ureotelic organisms are those that excrete nitrogenous waste in the form of urea. Earthworms are ureotelic since their nitrogenous waste composition consists of 40% urea and 20% ammonia. 

So, the correct answer is 'Ureotelic'.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Colloblast (adhesive) cells are the characteristic of 

  1. Hydra

  2. Comb jelly

  3. Obelia

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

Tentacles are the organs which are used to catch the prey. These are present at the opening of the gastrovascular cavity. Colloblasts are a cell type found in ctenophores. They are widespread in the tentacles of these animals and are used to capture prey. These are found in all ctenophores except those of the order Beroida, as they lack tentacles. So, the correct answer is option B.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

Which is absent in ctenophores?

  1. Epidermis

  2. Intercellular and intracellular digestion

  3. Cnidoblasts

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

Ctenophores have colloblast in their tentacles to capture/ disarm their prey as opposed to cnidarians like jelly fish having Cnidoblasts doing the same function.

So, the correct answer is 'Cnidoblasts'.

Multiple choice zoology animal diversity - i (inverterbrate phyla) ctenophora phylum ctenophora cnidaria

What is present in mesoglea of ctenophores which makes it a loose layer of cells?

  1. Amoebocytes

  2. Elastic cells

  3. Nerve cells and muscle cells

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

The loose layer of jelly-like substance in Ctenophores is mesoglea which are composed of muscle bundles and nerve fibres that lie under the epethelial cells. They are hydrostatic and have elastic cells along with amoebocytes that have a role in phagocytosis, 

So, the correct answer is 'All the above'.

Multiple choice

What is the largest, heaviest spider in the world?

  1. black widow

  2. orb-weaver spider

  3. goliath spider

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

The Goliath birdeater (often called the goliath spider) is the largest spider in the world by mass and size. Black widows and wolf spiders are much smaller.

Multiple choice zoology excretory system of human structure of nephron excretory system nephron

A Malpighian tubule empties urine into the

  1. Gut

  2. Coelom

  3. Lymph

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

Malpighian tubule, in insects, any of the excretory organs that lie in the abdominal body cavity and empty into the junction between midgut and hindgut. The tubule cells actively transport initial urine constituents (potassium ions, water, urate ions, sugar, amino acids) into the tubule. In some species urine is acidified in the distal end of the tubule and an aqueous suspension of uric acid crystals is conducted into the rectum, where water and nutrients are reabsorbed. In other species the urine is acidified in the rectum. Certain tubule cells may have special functions, as in the secretion of the sticky substance that surrounds eggs of certain leaf beetles or in the secretion of silk by certain immature beetles. Thus, option A is correct.

Multiple choice zoology excretory system of human structure of nephron excretory system nephron

A malpighian tubule empties its content into the

  1. Gut

  2. Coelom

  3. Lymph

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

A malpighian tubule empties its content into the gut. Malpighian tubule, in insects, any of the excretory organs that lie in the abdominal body cavity and empty into the junction between midgut and hindgut. In species having few malpighian tubules, they are long and coiled; in species with numerous (up to 150) tubules, they are short. The tubule cells actively transport initial urine constituents (potassium ions, water, urate ions, sugar, amino acids) into the tubule. In some species urine is acidified in the distal end of the tubule and an aqueous suspension of uric acid crystals is conducted into the rectum, where water and nutrients are reabsorbed. In other species the urine is acidified in the rectum. Certain tubule cells may have special functions, as in the secretion of the sticky substance that surrounds eggs of certain leaf beetles or in the secretion of silk by certain immature beetles.

Multiple choice zoology excretory system of human structure of nephron excretory system nephron

Malphigian tubules remove excretory products from

  1. Kidney

  2. Haemolymph

  3. Alimentary canal

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Malpighian tubules are excretory organs present in the cockroach. They lie freely in haemolymph. They remove excretory products from the haemolymph and open in the alimentary canal at the junction of the midgut and hindgut. In each cockroach, they are about 150 in number.
So, the correct answer is 'Haemolymph'.
Multiple choice bio-chemistry nucleic acids central dogma transcription and gene expression molecular biology

Which of the following is correctly matched?

  1. Ligase- Breaking DNA strand

  2. Flame cells- Roundworms

  3. Rous Sarcoma- Reverse transcriptase

  4. Thyroxine- Adrenal
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
a)  Restriction enzyme causes breaking DNA strand. Ligase helps in joining two DNA fragments.
b) Flame cells are absent in roundworms. 
c) Rous sarcoma virus (RSV) is a retrovirus causes sarcoma in chickens. The virus contains a reverse transcriptase which is a DNA polymerase that uses RNA as its template. This enzyme reverse transcribes RNA into cDNA and incorporation into the host genome.
d) Thyroxine is produced by the thyroid gland. 
So, the correct answer is 'Rous Sarcoma- Reverse transcriptase'.
Multiple choice bio-chemistry cell biology cytoplasm the components in a cell component of the cell

The main features of Cnidarians is their specialized cells called ________.

  1. Epithelial

  2. Cnidocytes

  3. Coenocytes

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

Cnidocytes contain stinging structure known as nematocysts. Cnidocytes in tentacular region help in capturing the larger prey as their nematocytes discharge toxins into their prey.

Multiple choice biology reproduction in living organisms regeneration asexual modes of reproduction reproduction in animals

Accumulation of cells and formation of a bud at the site of amputation is

  1. Morphallaxis

  2. Reparative bud

  3. Blastema

  4. Both A and B
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A.Morphallaxis - The reconstruction of an entire animal from a small fragment by reorganizing the existing cells, is called Morphallaxis.

B.Reparative bud - Regeneration of buds  in multicellular organisms is called reparative bud.

C.Blastema – A stumpy outgrowth or bulge or formed, by the accumulation of cells, during regeneration of injured part is called Blastema. It is one of the important step in the process of regeneration.

So, the correct option is ‘Blastema’.