Volvox is a polyphyletic genus of green algae belonging to the volvocine clade. Each mature Volvox colony contains up to thousands of cells divided into two distinct cell types: numerous flagellate somatic cells and a smaller number of germ cells lacking a soma that are embedded in the surface of a hollow sphere or coenobium containing an extracellular glycoprotein matrix.

1. Volvox contains the chlorophyll pigment .

a) Chlorophyll a

b) Chlorophyll b

c) Chlorophyll e

d) both (a) and (b)

The answer is option  (d) in conjunction with (a) and (b)

Explanation: Movement Each volvox cell is equipped with two flagella. The flagella beats in unison as the ball rolls through the water. Volvox cells contain chlorophyll and produce their own food through photosynthesis.

2. Volvox and Chlamydomonas are related in that they both .

a) are members of the Chlorophyta 

b) are both motile

c) both (a) and (b)

d) none of the above

The answer is option (c) in conjunction with (a) and (b)

3. Identify the erroneous match.

a) Laminaria – A thallus with flattened leaves

b) Volvox – A colonial, non-flagellated bacteria

c) Chlorella – A unicellular, non-flagellated bacteria

d) Chlamydomonas – A unicellular, flagellated bacteria

The answer is option  (a) Volvox – Non-flagellated colonial

4. Identify the statement about Volvox that is inaccurate.

a) Sexual reproduction is oogamous

b) there is no metamerism and no real coelom

c) non-flagellated somatic cells

d) phototaxis movement is present

The answer is option  (c) somatic cells are unflagellated

5. Coenobium is an abbreviation for .

a) a cluster of filaments

b) a palmelloid structure

c) a hollow spherical colony

d) none of the above

The answer is option (c).A colony with a hollow spherical shapeexplanation: A coenobium is a colony with a fixed number of cells that lacks or has little specialisation. They are found in several types of algae. Often embedded in a mucilaginous matrix, the cells can be motile or non-motile. Volvox and its relatives, Scenedesmus, Pediastrum, and Hydrodictyon are all examples.

6. Volvox is classified as a type of which of the following algae?

a) The Chlorophyceae

b) The Phaeophyceae

c) The Rhodophyceae

d) The Chrysophyceae.

The answer is option  (a) Chlorophyceae

7. Volvox contains ______ chloroplasts.

a) in the shape of a cup

b) in the shape of a ribbon 

c) in the shape of a girdle 

d) in the shape of a star

The answer is option  (a) cup-shaped

Explanation: Volvox are a type of green algae. They form colonies composed of numerous cells. The plant’s body is made up of a hollow sphere called coenobium.

8. Algae having motile colonies are referred to as .

a) Nostoc

b) Spirogyra

c) Chlamydomonas

d) Volvox

The answer is option  (d) volvox

9. Volvox sexual reproduction is .

a) Isogamous relationship

b) Anisogamous relationship 

c) Oogamous relationship 

d) None of the above

The answer is option  (c) Oogamous relationship

explanation: Each Volvox, as depicted in the illustration above, is a colonial organism. It is composed of between 1,000 and 3,000 photosynthetic algae arranged in a hollow sphere.

10. The structure of the protein and starch reserve in Chlorophyta is .

a) Pyrenoid

b) Conjunctivitis

c) Volutin

d) Paramylum

The answer is option  (a) Pyrenoid

11. The term “Coenobium” refers to one of the following: 

(a) a group of filaments

 (b) a palmelloid form 

(c) a hollow spherical colony

(d) None of the above.

The answer is option (c)

Explanation: coenobium (plural: coenobia) A loose association of unicellular organisms that live in colonies and may share a membrane. Often, the cells are held together by a jelly that is excreted by all colony members.

12. Algae that have a motile colony are

(a) Nostoc 

(b) Spirogyra 

(c) Chlamydomonas

(d) and Volvox 

The answer is option   (d)

Explanation: Motile colonies have been discovered in Volvox.

13. The structure of the protein and starch reserve in Chlorophyta is 

(a) Pyrenoid 

(b) Eye spot 

(c) Volutin

(d) Paramylum.

The answer is option (a)

14. Volvox and Chlamydomonas are similar in that they both 

(a) belong to the Chlorophyta 

(b) are motile 

(c) both (a) and (b)

(d) neither of the above.

The answer is option (c)

15. Volvox is classified as which of the following algae?

(a) Chlorophyceae

(b) Phaeophyceae 

(c) Rhodophyceae

(d) Chrysophyceae 

The answer is option (a)

Explanation: Volvox is a genus of green algae that contains approximately 20 freshwater species. Colonies are made up of thousands of cells. Each volvox colony contains between 500 and 60,000 cells.

16. Volvox’s chloroplasts are

 (a) cup-shaped

 (b) ribbon-shaped

 (c) girdle-shaped

 (d) star-shaped.

The answer is option (a)

Explanation: Volvox forms spherical or oval hollow colonies that contain between 500 and 60,000 cells embedded in a gelatinous wall and are frequently visible only to the naked eye.

17. Sexual reproduction in Volvox is one of the following: 

(a) isogamous 

(b) anisogamous 

(c) oogamous

(d) none of the above.

The answer is option (c)

18. Identify an erroneous match 

(a) Laminaria – A thallus with flattened leaves 

(b) Volvox – A colonial, non-flagellated genus 

(c) Chlorella – Single-celled, non-flagellated 

(d) Chlamydomonas – Single-celled, flagellated

The answer is option (b)

19. Volvox contains the chlorophyll pigments

 (a) Chlorophyll a

 (b) Chlorophyll b 

(c) Chlorophyll e

 (d) both (a) and (b) (b)

The answer is option (d)

explanation: Chlorophyll pigments a,b, and pyrenoids are found in members of the Chlorophyceae, such as Volvox, as stored food.

20. Determine which of the following statements regarding Volvox is incorrect:

 (a) Sexual reproduction is oogamous

 (b) real coelom and no metamerism

 (c) somatic cells are not flagellated 

(d) phototaxis movement occurs

The answer is option (c)

21. Motile algae are algae that have a motile colony.

(a) Nostoc

(b) Spirogyra

(c) Chlamydomonas sp.

(d) Volvox 

The correct option is d

22. In Chlorophyta, the protein and starch reserve structure is

(a) Pseudo

(b) Spot on the eye

(c) Volutin

(d) Pseudomylum 

The correct option is a

23. Volvox and Chlamydomonas are related due to their

(a) are members of the Chlorophyta

(b) they are both motile

(c) a combination of (a) and (b) 

(d) none of the preceding

The correct option is c

24. Volvox is classified as which of the following algae?

(a) Chlorophyceae 

(b) Phaeophyceae 

(c) Rhodophyceae 

(d) Chrysophyceae 

The correct option is a

25. Volvox contains chloroplasts.

(a) formed like a cup

(b) in the shape of a ribbon

(c) in the shape of a girdle

(d) shaped like a star

The correct option is a

26. Sexual reproduction is asexual in Volvox.

(a) Monogamous

(b) Monogamous

(c) Sexually oogamous

(d) None of the preceding

The correct option is c

27. Identify an erroneous match

(a) Laminaria – Thallus with flattened leaves

(b) Volvox – Non-flagellated colonial

(c) Chlorella — A single-celled, non-flagellated organism

(d) Chlamydomonas – Flagellated unicellular bacterium

The correct option is b

28. Identify the erroneous remark about Volvox

(a) Sexual reproduction occurs exclusively through oogamy.

(b) genuine coelom without metamerism

(c) somatic cells do not contain flagella

(d) the presence of phototaxis

The correct option is c