Phylum Platyhelminthes

Q. Read the following statements.

(a) Metagenesis is observed in helminths.

(b) Echinoderms are triploblastic and coelomate animals.

(c) Roundworms have an organ-system level of body organization.

(d) Comb plates present in ctenophores help in digestion.

(e) Water vascular system is characteristic of echinoderms.

Choose the correct answer from the options given below:

1. (b), (c) and (e) are correct
2. (c), (d) and (e) are correct
3. (a), (b) and (c) are correct
4. (a), (d) and (e) are correct

Q.

Explain the term guanotelic?

Q.

What are the peculiar features that you find in parasitic platyhelminthes?

Q. Hooks and suckers are present in:

1. Tapeworm
2. Earthworm
3. Hydra
4. Pleurobrachia

Q. Which among the following organisms have an incomplete digestive system?

1. Fasciola
2. Octopus
3. Asterias
4. Ascidia

Q.

Where can an incomplete digestive system be seen?

Q. The digestive system in platyhelminthes has

1. one opening
2. two opening
3. three opening
4. four opening

Q. First animals that were triploblastic and showed bilateral symmetry and organ level of organisation were a part of:

1. Phylum Aschelminthes
2. Phylum Ctenophores
3. Phylum Platyhelminthes
4. Phylum Cnidaria

Q. One example of animals having a single opening to the outside that serves both as mouth and as the anus is:

1. Asterians
2. Ascidia
3. Octopus
4. Fasciola

Q.

What is meant by uricotelism?

Q.

Which phylum of animals is also called flatworms?

Q. Match the following and choose the correct options:

Column I	Column II
A. Organ level	I. Pheretima
B. Cellular aggregate level	II. Fasciola
C. Tissue level	III. Spongilla
D. Organ system level	IV. Obelia

1. A-IV, B-II, C-III, D-I
2. A-IV, B-III, C-I, D-II
3. A-II, B-IV, C-III, D-I
4. A-II, B-III, C-IV, D-I

Q.

Do all triploblastic animals have a coelom?

Q. Choose the incorrect statement regarding regeneration and fragmentation.

1. Fragmentation occurs in multicellular species with simple body organization while regeneration can occur in multicellular species with complex body plans.
2. In fragmentation, an organism splits into fragments each of which can give rise to new organisms. In regeneration, a part of the body may be regenerated and not necessarily a whole organism.
   
3. Fragmentation is exhibited by invertebrates while regeneration is exhibited by both vertebrates and invertebrates.
   
4. Fragmentation involves specialised cells and complex differentiation processes to generate a whole organism while regeneration does not.

Q. Which of the following statements are true/false?
I. In higher phyla cellular level of organisation is seen.
II. Phylum Platyhelminthes have cellular level of organisation.
III. Cellular level of organisation is seen when the cells are not arranged as loose cell aggregates.
IV. Molluscs exhibit tissue level of organisation.

1. I and II are true, but Ill and IV are false
2. All statements are false
3. All statements are true
4. Ill and IV are true, but I and II are false

Q.

Which of the following statements are incorrect about Phylum Platyhelminthes?

1. Mesoglea is present in between ectoderm and endoderm in Obelia

2. Radial symmetry is found in Asterias

3. Fasciola is a pseudocoelomate animal

4. Taenia is a triploblastic animal

Q. In contrast to annelids the Platyhelminthes show

1. Bilateral symmetry
2. Presence of pseudocoel
3. Absence of body cavity
4. Radial symmetry

Q. Planaria possess high capacity of:

1. metamorphosis
2. bioluminescence
3. alternation of generation
4. regeneration

Q.

Prepare a list of some animals that are found parasitic on human beings.

Q.

Write the functions of excretory organs in animals?

Q. Total number of cells involved in double fertilisation is

1. 4
2. 5
3. 2
4. 3

Q. Which one of the following is a common feature of Taenia solium and Fasciola hepatica?

1. Presence of flame cells
2. Both are coelomates
3. Both belong to the class Trematoda
4. Both carry out external fertilization

Q. In Platyhelminthes,

1. nerve cords are present
2. nerve cords are absent
3. nerve nets are present
4. nerve nets and nerve cords are present

Q.

Is earthworm diploblastic or triploblastic?

Q.

Animals in which phylum show triploblasty, bilateral symmetry and cephalisation for the first time?

1. Porifera

2. Ctenophora

3. Cnidaria

4. Platyhelminthes

Q. Name the phylum to which liver fluke belongs.

Q. Platyhelminthes is the first phylum to show

1. bilateral symmetry
2. organ level of organisation
3. triploblastic development
4. all the above

Q. Which of the following does not belong to Phylum Platyhelminthes?

1. Planaria
2. Pheretima
3. Fasciola
4. Taenia

Q.

Which one of the following belongs to Phylum Platyhelminthes?

1. Wuchereria

2. Trypanosoma

3. Plasmodium

4. Fascioloa

Q.

Is hydra a diploblastic?