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NEET Exam  >  NEET Test  >  Biology Class 11  >  20-Minute Test: Algae - NEET MCQ

Algae - NEET Biology Class 11 Free MCQ Practice Test with solutions


MCQ Practice Test & Solutions: 20-Minute Test: Algae (20 Questions)

You can prepare effectively for NEET Biology Class 11 with this dedicated MCQ Practice Test (available with solutions) on the important topic of "20-Minute Test: Algae". These 20 questions have been designed by the experts with the latest curriculum of NEET 2026, to help you master the concept.

Test Highlights:

  • - Format: Multiple Choice Questions (MCQ)
  • - Duration: 20 minutes
  • - Number of Questions: 20

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20-Minute Test: Algae - Question 1
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Plants which are not differentiated into roots, stem and leaves are grouped under

Detailed Solution: Question 1

Thalloids have thallus(body) is not differentiated into leaves, or stem, etc. They do not have a vascular bundles also.

Topic in NCERT: Pteridophytes

Line in NCERT: "the main plant body is a sporophyte which is differentiated into true root, stem and leaves."

20-Minute Test: Algae - Question 2
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Identify the incorrectly matched pair:

Detailed Solution: Question 2

Let's analyze each pair to identify the incorrectly matched one:

  1. Chlamydomonas: Microscopic unicellular algae

    • This is correct. Chlamydomonas is indeed a microscopic unicellular alga.

  2. Volvox: Colonial algae

    • This is correct. Volvox forms colonial structures, making it a colonial alga.

  3. Ulothrix: Filamentous algae

    • This is correct. Ulothrix is a filamentous green alga.

  4. Fucus: Isogamous algae

    • This is incorrect. Fucus is a type of brown alga that reproduces via oogamous reproduction, not isogamous. Isogamous algae have gametes of similar shape and size, whereas Fucus has distinct male and female gametes.

So the incorrectly matched pair is:

4 Fucus: Isogamous algae

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20-Minute Test: Algae - Question 3
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 The storage bodies present in chloroplasts of chlorophyceae are called as ________

Detailed Solution: Question 3

In chlorophyceae, chloroplasts contain storage bodies called Pyrenoids. Pyrenoids consists of proteins and starch. Chlorophyceae sometimes store food as oil droplets.
Hence the correct option is "A" 

Topic in NCERT: Chlorophyceae

Line in NCERT: "most of the members have one or more storage bodies called pyrenoids located in the chloroplasts."

20-Minute Test: Algae - Question 4
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Study the figure and find out incorrect statement.

                

Detailed Solution: Question 4

The given diagram if of Brown Algae ( Fucus)

et’s examine each statement about brown algae Fucus to determine which one is incorrect:

  1. Contains laminarin or mannitol as reserve food.

    • This is correct. Brown algae like Fucus store reserve food in the form of laminarin and mannitol.

  2. They possess chlorophyll a, c, carotenoids and xanthophylls.
    This is correct phaeophyceace possess all these pigments.

  3. Union of gametes may take place in water or within the oogonium.

    • This is correct. In Fucus, fertilization can occur either in the water or within the oogonium (the female reproductive structure).

  4. Gametes with two apically inserted flagella.

    • This is incorrect. In Fucus, the gametes (sperm) have two laterally inserted flagella, not apically inserted.

So, the incorrect statement about Fucus is:

4. Gametes with two apically inserted flagella.

Topic in NCERT: Plant kingdom

Line in NCERT: "union of gametes may take place in water or within the oogonium."

20-Minute Test: Algae - Question 5
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The incorrect match for chlorophyll type is

Detailed Solution: Question 5

Option B is incorrect 

Chlorophyll a and b is found in green algae.

Topic in NCERT: Chlorophyceae

Line in NCERT: "chlorophyceae green algae chlorophyll a, b"

20-Minute Test: Algae - Question 6
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Which of the following is rich in protein used as food supplement by space travellers?

Detailed Solution: Question 6

The correct option is Chlorella.

Chlorella is a unicellular alga that is notably rich in proteins. It serves as a valuable food supplement, especially for space travellers. Here are some key points about Chlorella:

  • It is a type of green algae.
  • Chlorella is known for its high nutritional value.
  • It is often used in health supplements due to its protein content.
  • Its ability to thrive in various environments makes it a versatile food source.

Topic in NCERT: Algae

Line in NCERT: "chlorella a unicellular alga rich in proteins is used as food supplement even by space travellers."

20-Minute Test: Algae - Question 7
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What is a, b, c, and d in the given table for algae?

Detailed Solution: Question 7

1. Chlorophyceae:

  • Pigment: Chlorophyll a, b
  • Stored food: Starch
  • Flagella: 2-8 equal

2. Phaeophyceae (not Pheophyceae):

  • Pigment: Chlorophyll a, c, Fucoxanthin
  • Stored food: Laminarin
  • Flagella: 2, lateral unequal

3. Rhodophyceae:

  • Pigment: Chlorophyll a, d, Phycoerythrin
  • Stored food: Floridean starch
  • Flagella: Absent

Based on these points:

  1. a (Stored food for Chlorophyceae) is Starch.
  2. b (Class for the given pigments and stored food) is Phaeophyceae.
  3. c (Flagella for Phaeophyceae) is 2, lateral unequal.
  4. d (Stored food for Rhodophyceae) is Floridean starch.

So, the correct option is:

4. a : Starch; b : Phaeophyceae; c : 2 lateral unequal; d : Floridean starch

Topic in NCERT: Rhodophyceae

Line in NCERT: "food is stored as floridean starch which is very similar to amylopectin and glycogen in structure."

20-Minute Test: Algae - Question 8
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Why are algae considered useful?

Detailed Solution: Question 8

Algae are useful to man in a variety of ways. At least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis. Being photosynthetic they increase the level of dissolved oxygen in their immediate environment. They are of paramount importance as primary producers of energy-rich compounds which form the basis of the food cycles of all aquatic animals

Topic in NCERT: Algae

Line in NCERT: "algae are useful to man in a variety of ways. at least a half of the total carbon dioxide fixation on earth is carried out by algae through photosynthesis. being photosynthetic they increase the level of dissolved oxygen in their immediate environment. they are of paramount importance as primary producers of energy-rich compounds which form the basis of the food cycles of all aquatic animals."

20-Minute Test: Algae - Question 9
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Stipe, holdfast, and frond are the terms associated with:

Detailed Solution: Question 9

Correct answer: C. Laminaria (brown algae)

Explanation:
Laminaria, a type of brown algae, has a body structure divided into three parts: the holdfast (which anchors the algae to the substrate), the stipe (a stem-like structure), and the frond (the leaf-like structure).

Topic in NCERT: Pteridophytes

Line in NCERT: "the plant body is usually attached to the substratum by a holdfast, and has a stalk, the stipe and leaf like photosynthetic organ - the frond."

20-Minute Test: Algae - Question 10
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Leaf like photosynthetic organ is associated with algal group

Detailed Solution: Question 10

The members of phaeophyceae or brown algae are found primarily in marine habitats. They show great variation in size and form. They range from simple branched, filamentous forms (Ectocarpus) to profusely branched forms as represented by kelps, which may reach a height of 100 metres.They possess chlorophyll a, c, carotenoids and xanthophylls. They vary in colour from olive green to various shades of brown depending upon the amount of the xanthophyll pigment, fucoxanthin present in them. Food is stored as complex carbohydrates, which may be in the form of laminarin or mannitol. The vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of algin. The protoplast contains, in addition to plastids, a centrally located vacuole and nucleus. The plant body is usually attached to the substratum by a holdfast, and has a stalk, the stipe and leaf like photosynthetic organ – the frond.

20-Minute Test: Algae - Question 11
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Consider the following statements regarding brown algae:

I. The pigments are chlorophyll a, c, and xanthophylls, including fucoxanthin.
II. Storage food is laminarin and mannitol.
III. The cellulosic cell wall is covered with algin.
IV. They do not have a centrally located vacuole.
V. Their photosynthetic organs are called fronds, which are leaf-like structures.
VI. They have pear-shaped biflagellate zoospores.
VII. They have two unequal laterally attached flagella.

The number of correct statements is:

Detailed Solution: Question 11

Correct answer: B. 6

Explanation:

The correct statements are:

I. True. Brown algae contain chlorophyll a, c, and fucoxanthin, which give them their characteristic color.
II. True. Laminarin and mannitol are the storage products in brown algae.
III. True. The cell wall of brown algae is composed of cellulose and is covered with algin, a gelatinous substance.
IV. False. Brown algae have a centrally located vacuole and nucleus.(correction of false statement.
V. True. The photosynthetic organs of brown algae are called fronds, which are leaf-like structures.
VI. True. Brown algae produce pear-shaped biflagellate zoospores.
VII. True. The zoospores have two unequal, laterally attached flagella.

So, the number of correct statements is 6.

Topic in NCERT: Phaeophyceae

Line in NCERT: "they possess chlorophyll a, c, carotenoids and xanthophylls. food is stored as complex carbohydrates, which may be in the form of laminarin or mannitol. the vegetative cells have a cellulosic wall usually covered on the outside by a gelatinous coating of algin. asexual reproduction in most brown algae is by biflagellate zoospores that are pear-shaped and have two unequal laterally attached flagella."

20-Minute Test: Algae - Question 12
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Which one of the following statements is wrong?

Detailed Solution: Question 12

Certain marine brown and red algae produce large amounts of hydrocolloids (water holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially. Agar, one of the commercial products obtained from Gelidium and Gracilaria are used to grow microbes and in preparations of ice-creams and jellies. Chlorella a unicellular alga rich in proteins is used as food supplement even by space travellers

Topic in NCERT: Algae

Line in NCERT: "agar, one of the commercial products obtained from gelidium and gracilaria are used to grow microbes and in preparations of ice-creams and jellies."

20-Minute Test: Algae - Question 13
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What is the primary pigment responsible for the red color in most red algae?

Detailed Solution: Question 13

The primary pigment responsible for the red color in most red algae is R-phycoerythrin. This pigment gives the red algae their characteristic color. Red algae are commonly found in marine habitats, and R-phycoerythrin is the dominant pigment in their bodies.

Topic in NCERT: Rhodophyceae

Line in NCERT: "the members of rhodophyceae are commonly called red algae because of the predominance of the red pigment, r-phycoerythrin in their body."

20-Minute Test: Algae - Question 14
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What is the primary function of pyrenoids in some green algae?

Detailed Solution: Question 14

Most of the members of green algae have one or more storage bodies called pyrenoids located in the chloroplasts. Pyrenoids contain protein besides starch. Some algae may store food in the form of oil droplets.

Topic in NCERT: Chlorophyceae

Line in NCERT: "most of the members have one or more storage bodies called pyrenoids located in the chloroplasts. pyrenoids contain protein besides starch."

20-Minute Test: Algae - Question 15
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Kelps are

Detailed Solution: Question 15

According to the NCERT reference, kelps are large, brown seaweeds found in marine environments. They are classified as marine algae, specifically within the group of brown algae.

Topic in NCERT: Phaeophyceae

Line in NCERT: "the members of phaeophyceae or brown algae are found primarily in marine habitats."

20-Minute Test: Algae - Question 16
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An example of colonial alga is

Detailed Solution: Question 16

The form and size of algae is highly variable, ranging from colonial forms like Volvox.

Topic in NCERT: Chlorophyceae

Line in NCERT: "some commonly found green algae are: chlamydomonas, volvox, ulothrix, spirogyra and chara."

20-Minute Test: Algae - Question 17
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Photosynthetic pigments common to all algae :-

Detailed Solution: Question 17

Chlorophyll a is the only common pigment found in all types of algae.

20-Minute Test: Algae - Question 18
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Sexual reproduction by non-flagellated but similar-sized gametes is seen in:

Detailed Solution: Question 18

Sexual reproduction takes place through fusion of two gametes. These gametes can be flagellated and similar in size (as in Ulothrix) or non-flagellated (non-motile) but similar in size (as in Spirogyra). Such reproduction is called isogamous

Topic in NCERT: Sexual reproduction in algae

Line in NCERT: "sexual reproduction takes place through fusion of two gametes. these gametes can be flagellated and similar in size (as in ulothrix) or non-flagellated (non-motile) but similar in size (as in spirogyra). such reproduction is called isogamous."

20-Minute Test: Algae - Question 19
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Which of the following is an example of anisogamous reproduction in algae?

Detailed Solution: Question 19

Fusion of two gametes dissimilar in size, as in species of Eudorina is termed as anisogamous. Fusion between one large, nonmotile (static) female gamete and a smaller, motile male gamete is termed oogamous, e.g., Volvox, Fucus.

Topic in NCERT: Sexual reproduction in algae

Line in NCERT: "fusion of two gametes dissimilar in size, as in species of eudorina is termed as anisogamous."

20-Minute Test: Algae - Question 20
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If you are asked to classify the various algae into distinct groups, which of the following characters should you choose?
1 Types of pigments present in the cell
2 Nature of stored food materials in the cell
3 Structural organization of thallus
4 Chemical composition of the cell wall

Detailed Solution: Question 20

Option A is correct.

The primary characters used for the basic classification of algae at this level are the types of pigments present and the nature of stored food. These two characters distinguish the major algal groups: for example, Chlorophyceae (green algae) contain chlorophyll and store starch; Phaeophyceae (brown algae) contain fucoxanthin and store laminarin; Rhodophyceae (red algae) contain phycobilins and store floridean starch.

Structural organization of the thallus and the chemical composition of the cell wall can help in more detailed or advanced divisions, but the basic grouping here is based on pigments and stored food.

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This test contains 20 MCQs on 20-Minute Test: Algae with detailed solutions for each question. It is part of the Biology Class 11 course on EduRev, designed to align with the current NEET syllabus. Each solution explains not just the correct answer but also gives you an understanding of the topic — not just to attempt the question but also help you prepare for the exam with practice.

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