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Test: Algae (NCERT) - NEET MCQ


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20 Questions MCQ Test Biology Class 11 - Test: Algae (NCERT)

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Test: Algae (NCERT) - Question 1

What is a characteristic feature of algae?

Detailed Solution for Test: Algae (NCERT) - Question 1
  • Algae are primarily characterized by being chlorophyll-bearing, which allows them to carry out photosynthesis.
  • They are simple, thalloid (lacking differentiated stems, leaves, and roots), autotrophic (producing their own food through photosynthesis), and are commonly found in aquatic environments, including both freshwater and marine habitats.
  • Some can also thrive in various other habitats such as moist stones, soils, and wood.
  • It's important to note that algae are not heterotrophic as they produce their own food through photosynthesis.

297,800+ Algae Stock Photos, Pictures & Royalty-Free Images - iStock |  Green algae, Seaweed, Kelp

Fig: Chlorophyll bearing and mostly aquatic algae

Test: Algae (NCERT) - Question 2

Which of the following are first evolved plants with vascular tissues?

Detailed Solution for Test: Algae (NCERT) - Question 2
  • Pteridophytes are the first ever evolved plants with vascular tissue in them i.e. they contain xylem and phloem.
  • As they contain vascular tissues, they are capable of growing several meters tall.
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Test: Algae (NCERT) - Question 3

Major photosynthetic pigments in green algae are

Detailed Solution for Test: Algae (NCERT) - Question 3

The photosynthetic pigments in green algae mainly consist of two types, namely chlorophyll a and chlorophyll b. These pigments play a pivotal role in the process of photosynthesis by aiding in the absorption of light energy.

They harness the energy from sunlight and use it to power the process of photosynthesis, which is vital for the survival and growth of the algae. They do not possess other pigments like chlorophyll c, d or fucoxanthin, or phycoerythrin as indicated in the other options. Therefore, the correct answer is Option A: Chl a and b.

Test: Algae (NCERT) - Question 4

Read the given statements about algae and select the correct option.
(i) Plant body is thalloid.
(ii) largely aquatic.
(iii) Reproduction by vegetative, asexual and sexual methods.
(iv) Chlamydomonas, Volvox and Ulothrix are the multicellular algae.

Detailed Solution for Test: Algae (NCERT) - Question 4

Statement (i): Plant body is thalloid.

  • Algae, being simple plants, do not have well-differentiated plant bodies. Instead, they have a thalloid plant body, which means their bodies are not differentiated into stems, leaves, and roots like higher plants. This statement is true.


Statement (ii): Largely aquatic.

  • Algae are predominantly aquatic organisms. They are found in a variety of habitats, ranging from freshwater to marine environments, and some can even be found on moist stones, soils, or wood. Thus, this statement is also true.


Statement (iii): Reproduction by vegetative, asexual and sexual methods.

  • Algae reproduce through a variety of methods including vegetative (by fragmentation), asexual (by the formation of spores), and sexual (by the fusion of gametes) reproduction. So, this statement is accurate as well.


Statement (iv): Chlamydomonas, Volvox, and Ulothrix are the multicellular algae.

  • This statement is partially correct. Chlamydomonas is a unicellular green alga, not multicellular. On the other hand, Volvox and Ulothrix are indeed multicellular algae. Therefore, as a whole, this statement is not completely accurate.


Based on the analysis of each statement, options (i), (ii), and (iii) are true. Therefore, the correct answer is Option C: Statements (i), (ii), and (iii) are true.

Test: Algae (NCERT) - Question 5

The algae shown in figure belong to the class

Detailed Solution for Test: Algae (NCERT) - Question 5

The algae shown in figure are Chlamydomonas, Volvox and Chara respectively, belonging to class Chlorophyceae.

Class Chlorophyceae (Green Algae):

  • These algae are commonly known as green algae.
  • They are usually found in fresh water and marine environments.
  • The pigments include chlorophyll a and b, which gives them a bright green color.
  • They store food in the form of starch.
  • Most of them are unicellular, but some are multicellular.

 

Test: Algae (NCERT) - Question 6

Green algae usually have a rigid cell wall made of an inner  layer of _______ and an outer layer of ________

Detailed Solution for Test: Algae (NCERT) - Question 6

Cell wall of green algae is thin, transparent andd form and consists of outer pectic and inner cellulosic layers. It is smooth but in most of species it gets thickened at the anterior end to form an apical papilla.

Test: Algae (NCERT) - Question 7

In most green algae, pyrenoids represent the storage bodies located in _________ .

Detailed Solution for Test: Algae (NCERT) - Question 7

Pyrenoids are cellular micro-compartments, and are not membrance bound organelles. Pyrenoids are found within chloroplast. Chloroplasts generally contain one to many pyrenoids for storage of starch. 

Test: Algae (NCERT) - Question 8

Which of the following is an example of a filamentous alga?

Detailed Solution for Test: Algae (NCERT) - Question 8

Ulothrix is a filamentous form of algae. Filamentous algae are characterized by their thread-like structures composed of a chain of cells.

Fig: Ulothrix

Other examples of filamentous algae include Spirogyra and Cladophora. Volvox (Option A) is a colonial alga, Fucus (Option B) is a marine brown alga, and Porphyra (Option C) is a red alga.

Test: Algae (NCERT) - Question 9

Fusion of two gametes which are dissimilar in size is termed as

Detailed Solution for Test: Algae (NCERT) - Question 9

Fusion of two gametes dissimilar in size, as in species of Eudorina is termed as anisogamous acc. to ncert textbook.

Test: Algae (NCERT) - Question 10

Identify the given figures of algae and select the correct option.


A (a) Fucus (b) Polysiphonia
B (a) Dictyota (b) Polysiphonia
C (a) Dictyota (b) Porphyra
D (a) Porphyra (b) Polysiphonia

Detailed Solution for Test: Algae (NCERT) - Question 10

Dictyoia is a ribbon shaped dichotomously branched marine brown alga that grows in shallow waters. Its frond is flat and dichotomously branched.

Polysiphonia is a small, upright, bushy marine red alga, fixed to the substratum by rhizoids, hold fast, etc.

Test: Algae (NCERT) - Question 11

How does vegetative reproduction occur in algae?

Detailed Solution for Test: Algae (NCERT) - Question 11

Vegetative reproduction in algae occurs through fragmentation. When a part of the algal thallus breaks off, it can develop into a new individual. This method of reproduction is common in many types of algae.

Test: Algae (NCERT) - Question 12

Read the given statements and select the correct option.
Statement 1 : Volvox forms spherical colony.
Statement 2 : Volvox colony is made up of non - motile cells. 

Detailed Solution for Test: Algae (NCERT) - Question 12

Volvox is colonial green alga. The cells are like unicelled alga chlamydomonas and are definitely organized in the form of a colony called coenohimn. The coenobia of Volvox are largest, highly differentiated and well evolved among motile forms. Each coenobium is motile, the movement is brought about by the joint action of the flagella of individual call.

Test: Algae (NCERT) - Question 13

Which compounds are commercially extracted from certain red and brown algae?

Detailed Solution for Test: Algae (NCERT) - Question 13

Certain red and brown algae are sources of hydrocolloids used in various commercial applications. Algin is extracted from brown algae, while carrageen is obtained from red algae. These hydrocolloids are used in industries for their thickening, stabilizing, and gelling properties in products like food, cosmetics, and pharmaceuticals.

Test: Algae (NCERT) - Question 14

Which type of sexual reproduction is found in Volvox?

Detailed Solution for Test: Algae (NCERT) - Question 14

Volvox shows advanced oogamy which takes place by the formation of antheridia and oogonia. They may be formed on the same plant (monoeclous) or on different plants(dioecious). The sex-organs are produced fewer in number.

Test: Algae (NCERT) - Question 15

The "seaweeds" that form the under water forest are

Detailed Solution for Test: Algae (NCERT) - Question 15

The underwater forest consists of a variety of seaweed species. These "seaweeds" are not only essential for the ocean's ecosystem, but they also have a significant impact on human life. The three primary types of seaweeds that form these underwater forests include:

  • Kelps: This is a common type of seaweed. It grows in "forests" in the cold waters of the world's oceans. Kelp plays a crucial role in ocean ecosystems and is a source of food and habitat for a variety of marine species.
  • Laminaria: This is another type of kelp that forms dense, forest-like groupings underwater. Laminaria serves as a habitat for many marine species. Besides, it is used in food and medicine due to its high iodine and potassium content.
  • Macrocystis: Also known as giant kelp, Macrocystis is the largest of all algae and can grow up to 50 meters in length. It forms dense forests that provide shelter and food for a diverse range of marine species. It is also used in the food industry as a thickener and stabilizer.

Hence, the correct answer is D: All of these, as all three - Kelps, Laminaria, and Macrocystis - are types of "seaweeds" that form the underwater forest.

Test: Algae (NCERT) - Question 16

In Ulothrix, sexual reproduction is by

Detailed Solution for Test: Algae (NCERT) - Question 16

Isogamous type of sexual reproduction is found in Ulothrix and in majority, the plants are heterothallic. The gametes are found in large number, I.e. 32 to 64 in each gametangium.

Test: Algae (NCERT) - Question 17

Which one of the following cannot fix nitrogen?

Detailed Solution for Test: Algae (NCERT) - Question 17

Nostoc and Anabaena are nitrogen fixing blue-green algae, Azotobacter is free-living nitrogen fixing bacterium, while Spirogyra is a green alga which does not fix atmospheric nitrogen.

Test: Algae (NCERT) - Question 18

Agar-agar is commercially obtained from

Detailed Solution for Test: Algae (NCERT) - Question 18

Agar is dried gel-like non-nitrogenous extract obtained from red algae. It is used as a medium in the cultures of bacteria, fungi and other micro-organisms and also in numerous industrial processes, e.g., food, bakery, cosmetics, leather, textile, industries, in confectionary, etc.

Test: Algae (NCERT) - Question 19

Seaweeds are a source of

Detailed Solution for Test: Algae (NCERT) - Question 19

Seaweeds are rich in minerals such as iodine, calcium sodium, magnesium, potassium, iron, zinc, copper. Seaweeds also provide fibre, vitamins, enzyme and high quality protein.

Test: Algae (NCERT) - Question 20

The members of Phaeophyceae or brown agae are found primarily in/on

Detailed Solution for Test: Algae (NCERT) - Question 20

Phaeophyceae, commonly known as Brown Algae, predominantly inhabit marine environments. They are most commonly found in cold water regions and are especially abundant in the temperate and polar zones.

Adaptation: Brown algae are well adapted to survive in marine environments due to their strong holdfasts, which help them attach securely to rocks and other substrates, preventing them from being swept away by strong currents or waves.

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