Tag: life

Questions Related to life

In a biological community, Gauze's principle explains.

botany taxonomy and systematic botany life introduction to plant kingdom classification of organisms

  1. Competition among different species under unlimited resources

  2. Competitive exclusion of an inferior species due to the limited natural resources

  3. Coexistence of closely related species due to resource partitioning

  4. Intra specific competition due to limited natural resources

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Correct Option: A

Which one of the following statements is incorrect about the occurrence of notochord?

botany taxonomy and systematic botany life introduction to plant kingdom classification of organisms

  1. It is present only in larval tail in ascidian.

  2. It is replaced by a vertebral column in adult frog.

  3. It is absent throughout life in humans from the very beginning.

  4. It is present throughout life in Amphioxus.

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Correct Option: C
Explanation:

Humans belong to the Phylum Chordate. Animals belonging to the Phylum Chordata possess a notochord either during early embryonic life or throughout the embryonic life. In some, it Is replaced by vertebral column. In humans, notochord is present only In the embryonic stage, it is replaced by vertebral column in the adult form.

The term Classification was coined by

biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

  1. Theophrastus

  2. A.P.de candolle

  3. Aristotle

  4. Linnaeus

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Correct Option: A
Explanation:
  • The classification term was coined by 'Theophrastus'.
  • The term taxonomy was coined by A. P. de Candolle.
  • Aristotle divided animals into two groups based on whether they have red blood or not.
  • Linnaeus proposed a binomial system of nomenclature.
  • So, the correct option is 'Theophrastus'.

Classification deals with 

biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

  1. Identification of organisms

  2. Arranging organisms into groups

  3. Arranging organisms in herbaria and museums.

  4. Naming, identification and grouping of organisms

Show answer
Correct Option: B
Explanation:
Classification deals with the arrangement of animals and plants in taxonomic groups according to their observed similarities and differences (including at least kingdom and phylum in animals, division in plants, and class, order, family, genus, and species).

Term vertebrate and invertebrate are given by 

biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

  1. John Ray

  2. Linneaus

  3. Lamark

  4. Leucart

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Correct Option: C
Explanation:

Lamarck, the French naturalist was the one who introduced the taxonomic distinction between vertebrates and invertebrates.
John ray was the first to give the definition of 'species'.
Carl Linnaeus gave the 'binomial nomenclature' for living beings.

Leuckart is remembered for his work in parasitology, particularly research regarding tapeworm and trichinosis. 
So, the correct answer is option C.

Nerve cord is in ............ position in invertebrates.

biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

  1. Dorsal

  2. Lateral

  3. Ventral

  4. Absent

Show answer
Correct Option: C
Explanation:
The ventral nerve cord is a bundle of nerve fibers, typically a solid double strand (pair) of nerve cords, that runs along the longitudinal axis of some phyla of elongate invertebrates, and forms part of the invertebrate central nervous system. In most cases, this nerve cords runs ventrally, below the gut, and connects to the cerebral ganglia. Among the phyla exhibiting ventral nerve cords are nematodes (roundworms), annelids (such as earthworms, and arthropods (such as insects and crayfish).
The ventral nerve cord usually consists of a pair of partially fused nerve trunks running longitudinally along the ventral plane of the animals, from the anterior to posterior (the thoracic and abdominal tagma in the arthropods).

So, the correct answer is option A.

Which of the following are not the trends observed in the evolution of the central nervous system in invertebrates?

biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

  1. Increased size of cerebral ganglia and formation of a 'brain'

  2. Reduction in the number of nerve cords

  3. Replacement of nerve cords by nerve nets

  4. Dominance of the ventral pair of nerve cords

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Correct Option: C
Explanation:

The nervous system of animals has evolved a lot from metazoans to mammals. Cnidarians happen to have the simplest nervous system comprising mainly nerve nets. It is assumed that this is the group of animals that the modern nervous system has evolved from. Hence, it can be said that nerve nets have been replaced by nerve nets and not the other way around.

So, the correct answer is 'Replacement of nerve cords by nerve nets'.

Valveless single chambered heart is found in

biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

  1. Herdmania

  2. Scoliodon

  3. Catla

  4. Amphioxus

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Correct Option: A

.......... are called as moss animals.

biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

  1. Loricifera

  2. Ectoprocta

  3. Acanthocephala

  4. Gastrotricha

Show answer
Correct Option: B
Explanation:

The Bryozoa, also known as Polyzoa, Ectoprocta or commonly as moss animals, are a phylum of aquatic invertebrate animals. They are filter feeders that sieve food particles out of the water using a retractable lophophore a "crown" of tentacles lined with cilia. Most marine species live in tropical waters, but a few occur in oceanic trenches, and others are found in polar waters. 

Therefore, the correct answer is option B.

Larva occurs in

biology biodiversity and its classifications life introduction to plant kingdom classification of organisms

  1. Invertebrates

  2. Vertebrates

  3. Both A and B

  4. None of the above

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Correct Option: C