Tag: the living world: adaptations and classification

Questions Related to the living world: adaptations and classification

An animals phylum is defined on the basis of 

biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

  1. Number of germ layers

  2. the uniqueness of its body plan

  3.  type of body symmetry

  4. All the above

Show answer
Correct Option: D
Explanation:
An animal phylum is defined on the basis of 6 parameters of which three are - number of germ layers - diploblastic or triploblastic. Type of body plan i.e blind sac pattern, tube within tube pattern and body symmetry - asymmetry, radial symmetry and bilateral symmetry
So, the correct answer is 'All the above'

Animals of class ciliata

biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

  1. Have two nuclei

  2. Are autotrophs

  3. Reproduce sexually

  4. Possess cilia

Show answer
Correct Option: A,D
Explanation:
Animals of class ciliata are characterised by the presence of hair-like organelles called cilia. They have two types of nuclei: a tiny, diploid micronucleus (generative nucleus) which carries the germline of the cell, and a large, polyploid macronucleus (vegetative nucleus) which takes care of general cell regulation, expressing the phenotype of the organism. Most ciliates are heterotrophs. Ciliates reproduce asexually, by various kinds of fission.
So, the correct options are 'Have two nuclei and possess cilia'.

A cell placed in hypotonic solution will 

biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

  1. Shrink

  2. Swell up

  3. Retain its size

  4. Be plasmolysed

Show answer
Correct Option: B
Explanation:

If the medium surrounding the cell has a higher water concentration than the cell,i.e., it is very dilute (hypotonic solution), then the cell will gain water by osmosis and will swell up.

Identify the molluscs without shell.

biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

  1. Snail

  2. Oyster

  3. Slug

  4. Lobster

Show answer
Correct Option: C
Explanation:

Lobsters, snails and oysters all have significantly visible shells on their bodies.

Slugs do not have any shell
So the correct answer is 'Slug'. 

Which of the following worms are categorized as thread worms?

biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

  1. Tapeworm

  2. Earthworm

  3. Roundworm

  4. None of the above

Show answer
Correct Option: C
Explanation:

Threadworms are a type of roundworms.

Common characteristics of roundworms that confirm this are:
1. First organisms with organ level classification
2. They are often parasitic
3. Triploblastic
4. Bilaterally symmetrical
So the correct answer is 'Roundworms'.

Which of the following animal phylum includes segmented worms?

biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

  1. Annelida

  2. Arthropoda

  3. Mollusca

  4. None of the above

Show answer
Correct Option: A
Explanation:

Molluscs do not have segmentation in their bodies.

Arthropoda has segmentation as a character but it does not include worms.
Annelids is the phylum of the segmented worms.
Some characteristics of Annelids are:
1. Segmented bodies.
2. Bilaterally symmetrical.
3. First organisms with organ level classification.
So the correct answer is 'Annelida'.

Sea cucumber belongs to phylum 

biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

  1. Porifera

  2. Mollusca

  3. Echinodermata

  4. None of the above

Show answer
Correct Option: C
Explanation:

Sea cucumber belongs to Echinodermata.

Some characteristics of Echinodermata are:
1. Radial symmetry
2. Triploblastic
3. Exclusively marine
4. Presence of Exoskeleton
So the correct answer is 'Echinodermata'.

Animals do not show diversity in ______.

biology the living world: adaptations and classification animal classification and its benefits criteria for new system of classification five kingdoms of living organisms

  1. Volume

  2. Life style

  3. Shape

  4. Cell

Show answer
Correct Option: A
Explanation:

The animal kingdom is incredibly diverse, most animals limits on animal size and shape and lifestyle.

So, the correct option is 'Volume'.