Echinodermata

Q. Question 35
Would a Planaria cut vertically into two halves regenerate into two individuals? Complete Figure D and E by indicating the regenerated regions.

Q. What is the mode of reproduction in Planaria?

1. Budding
2. Fragmentation
3. Regeneration
4. Fission

Q. What happens when: a) planaria gets into two pieces, b) a mature spirogyra filament attains considerable length (2)
Ans. a) When planaria gets cut into two pieces, each of the pieces regenerate to produce individual organisms.
b) When a mature spirogyra filament attains considerable length, it splits into two or more parts. Each part grows substantially.
(I got only 1 out of 2 marks, 1/2 each)
What should I add?

Q.

Why do more complex organisms cannot give rise to new individuals through regeneration? [3 MARKS]

Q.

Describe regeneration.

Q.

Which of the following organism can show regeneration of whole new organism from a cut part of its body?

1. Lizard

2. Tapeworm

3. Planaria

4. Starfish

Q. Explain the term "Regeneration" as used in relation to reproduction of organisms. Describe briefly how regeneration is carried out in multicellular organisms like Hydra.

Q. What is regeneration? State a reason why a more complex organism cannot give rise to new individuals through this method

Q.

Annelids and Nematodes are bilaterally symmetrical, cylindrical in shape and triploblastic. Yet, these are divided into two groups because of the difference(s) in

1. Due to different type of coelom
2. Due to presence of body segmentation
3. Due to presence of well developed circulatory system
4. All of these

Q. What is body symmetry? Explain.

Q.

Peculiar water driven tube system is the unique feature of the following group:

1. Echinodermata

2. Arthropoda

3. Annelida

4. Platyhelminthes

Q.

What are the two types of regeneration?

Q. What is the difference between regeneration and fragmentation ?

Q. Why regeneration is mechanism for reproduction in lower organisms but not in higher organisms

​​

Q. Why is regeneration not true for all multicellular organisma? Explain.

Q. What is the difference between fragmentation and regeneration,
give any 2 differences ?

Q.

Question 3
Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?

Q. Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?

Q. Which one of the following animal is not deuterostome?

1. Ambystoma
2. Amphilina
3. Amphiuma
4. Anguilla

Q. Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?

Q. Choose the correct answer.
A. Organisms with two germ layers are called:
B. Innermost germ layer in triploblastic organisms is called:
C. Jellyfish is a triploblastic organism.

Diploblastic
Mesoderm
Triploblastic
True
Endoderm
False

Q. include spiny-skinned organisms.

1. Mollusca
2. Protochordata
3. Echinodermata

Q. Power of regeneration is found in:

1. Planaria
2. Hydra
3. Both A and B
4. None of the above

Q. What is the difference between regeneration and fragmentation?

Q. Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?

Q.

Question 28
Hard calcium carbonate structures are used as skeleton by

(a) Echinodermata
(b) Protochordata
(c) Arthropoda
(d) Nematoda

Q.

Solve the puzzle.

Across:

1. In leech, excretion takes place by segmentally arranged paired tubules called _________.

2. Leech has anterior and posterior ________.

Down:

3. _________ are absent in the leech.

4. _________ are absent in the leech.

Q. Identify Me. [Textbook Question No.1 Pg no. 75]

• I am diploblastic & acoelomate. Which phylum do I belong to?
• My body is radially symmetrical. Water vascular system is present in my body. I am referred as fish though I am not. What is my name?
• I live in your small intestine. Pseudocoelom is present in my thread like body. In which phylum will you include me?
• Though I am multicellular, there are no tissues in my body. What is the name of my phylum?

Q.

Which of the following characteristic feature is unique to Phylum Echinodermata?

1. They are triploblastic

2. They have true coelom

3. They have spiny skin

4. They are found only in marine condition.

Q. Starfish and sea urchin belong to the phylum ___.

1. Mollusca
2. Arthropoda
3. Coelenterata
4. Echinodermata