Tag: zoology

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Questions Related to zoology

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

A suctorial mouth is present in 

  1. Leech

  2. Ascaris

  3. Tapeworm

  4. Earthworm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Leeches are ectoparasites and they mostly live on the blood of vertebrate animals, like - humans, cattle, etc. They have a sanguivorous i.e. blood-sucking feeding habit. The blood-sucking habit of Leeches is supported by a special adaptation in their mouth.
  • Their mouth is a narrow triradiate aperture that sits at the center of the pre-oral chamber of the oral sucker. The oral sucker (or anterior sucker) is a tiny hollow muscular organ present at the anterior end of the animal body. 
  • The pre-oral chamber is actually a cup-like depression at the ventral surface of the oral sucker. One ray of the mouth is in medio-dorsal position, while the other two are placed ventro-laterally. 
  • This specially modified mouth of the Leeches is called suctorial mouth. When a feeding leech firmly adheres to the host body, its suctorial mouth moves like a saw and makes a triradiate (i.e. Y-shaped) painless incision in the victim's skin. Then the oozing blood of the host is sucked by the Leech. 
Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

Match the locomotory organs given with the phylum, in which they are seen. Choose the answer which gives the correct combination of the alphabets of the two columns:

Locomotory organ Phylum
A. Pseudopodia p. Mollusca
B. Parapodia q. Chondrichthyes
C. Muscular foot r. Protozoa
D. Fins s. Annelida


  1. A- r, B- p, C- s, D- q

  2. A- p, B- r, C- s, D- q

  3. A- s, B- r, C- q, D- p

  4. A- r, B- s, C- p, D- q
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pseudopodia are the temporary extensions of the cytoplasm. These are used in locomotion and feeding. These are used by the protozoans and some of the flagellate protozoans. Polychaete worms  are the group of worms which belong to the phylum of Annelids. They are characterized by an elongated and segmented body. They bear a pair of appendages called parapodia on each metamere. These are used for locomotion. The organisms which are mollusc and belongs to the class of Gastropoda, have a flattened muscular foot for locomotion. They have a head that bears stalked eyes. Chondrichthyans are the group of cartilagenous fishes. Many chondrichthyans possess two dorsal fins, one anterior (just behind the head) and another posterior (in front of the tail).

Thus, the correct answer is option D. 

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

Which one of the following is a matching pair of a body feature and the animal possessing it?

  1. Ventral heart - Scorpion

  2. Post anal tail - Octopus

  3. Ventral central nervous system - Leech

  4. Pharyngeal gill slits absent in embryo- Chamaeleon
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The scorpion heart is a strong, muscular organ extending along the dorsal mid-line of the heart.
Octopus has four pairs of arms, like all cephalopods.
Chamaeleon has pharyngeal gill slits in the embryo stage.
The central nervous system in leech is ventral.

Thus, the correct answer is option (C).

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

'Skate sucker' is the common name of 

  1. Hirudo

  2. Hirudinaria

  3. Pontobdella

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

Pontobdella is the type of leech. They are also known as skate sucker. It is the genus of leeches which includes bilaterally symmetrical animals. They belong to the class of Clitellata. It is marine leech. They are parasitic worms and attack skates and rays. They attach to the rock and wait to attack the skate. They also attack certain plaice. 

Thus, the correct answer is option C. 

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

External segmentation is absent but internal segmentation is present in

  1. Polychaeta

  2. Oligochaeta

  3. Archiannelida

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

Archiannelids are a group of annelids that show internal segmentation by septa, but lack the external segmentation (annuli) characteristic of other annelid classes.

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

Waste laden cells of oligochaetes and polychaetes are

  1. Thesocytes

  2. Eleocytes

  3. Follicular cells

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

Yellow cells (chloragogen cells) in oligochaetes and polychaetes are specialized cells found in the coelomic fluid that accumulate waste products, functioning similarly to a liver.

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

Larva of Bonellia settling near proboscis of adult female develops into male due to.

  1. Substances secreted by proboscis

  2. Electrolytes in water

  3. Oxygen in environment

  4. Carbon dioxide in environment
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Baltzer showed that if a Bonellia larva settles on the seafloor, it becomes a female. However, should a larva land on a female's proboscis (which apparently emits chemical signals that attract the larva), it enters the female's mouth, migrates into her uterus, and differentiates into a male. Thus, if a larva lands on the seafloor, it becomes female; if it settles on a proboscis, it becomes male.

So, the correct answer is 'Substances secreted by proboscis'.
Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

Presence of Tubifex in water body indicates its

  1. Purity

  2. High salt content

  3. Toxic metals

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

#Answer is option D.


#Tubifex worms mainly like nutrient-rich water, where bacterial growth is highest. Worms feed on bacteria and sludge.
#Bacterial growth takes place in water which has high organic loading. like, household organic waste, industrial organic waste, and agricultural waste.
#At this kind of places worms get food and places to hide from predators.

Multiple choice zoology structural organization of animals structural organization of leech phylum annelida annelida structural organization of rabbit

Choose the correct answers from the alternatives given.


Earthworms differ from most of the marine annelids as in that earthworms:

  1. Lack setae that marine annelids have

  2. Lack paddle-like parapodia that marine annelids have

  3. Have segments, whereas marine annelids do not

  4. Have well-developed brains and sensory organs in the head region, whereas marine annelids do not
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In polychaetes (or marine annelids) parapodia are present that help in gaseous exchange and in movement. Parapodia is absent in earthworm and in earthworms respiration is through skin. So, the correct answer is 'lack paddle-like parapodia that marine annelids have'.