Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What level of organization is characteristic of animals belonging to Phylum Porifera?
The NCERT states, 'These are primitive multicellular animals and have cellular level of organisation.' and also 'in sponges, the cells are arranged as loose cell aggregates, i.e., they exhibit cellular level of organisation.'.
What is the primary function of the water transport or canal system in sponges?
NCERT mentions, 'This pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste.'
Which of the following structures is responsible for the skeletal support in sponges?
As per NCERT, 'The body is supported by a skeleton made up of spicules or spongin fibres.'
Regarding reproduction in sponges, which statement is correct?
The NCERT text states, 'Sponges reproduce asexually by fragmentation and sexually by formation of gametes.'
What term describes sponges given that eggs and sperms are produced by the same individual?
The NCERT states, 'Sexes are not separate (hermaphrodite), i.e., eggs and sperms are produced by the same individual.'
Which of the following examples are representative members of Phylum Porifera?
Figure 4.5 in the NCERT book explicitly shows 'Examples of Porifera: (a) Sycon (b) Euspongia (c) Spongilla'.
Fertilization and development in sponges are described as:
The NCERT text indicates, 'Fertilisation is internal and development is indirect having a larval stage which is morphologically distinct from the adult.'
Water enters the spongocoel through which minute pores in the body wall of sponges?
The NCERT states, 'Water enters through minute pores (ostia) in the body wall into a central cavity, spongocoel.'
Which of the following features makes the larval stage of a sponge distinct from its adult form?
The NCERT mentions 'development is indirect having a larval stage which is morphologically distinct from the adult.'
What is the common term used for members of Phylum Porifera?
The first line under Phylum Porifera states, 'Members of this phylum are commonly known as sponges.'
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