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Test: Algae - 1


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30 Questions MCQ Test Biology Class 11 | Test: Algae - 1

Test: Algae - 1 for NEET 2023 is part of Biology Class 11 preparation. The Test: Algae - 1 questions and answers have been prepared according to the NEET exam syllabus.The Test: Algae - 1 MCQs are made for NEET 2023 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Algae - 1 below.
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Test: Algae - 1 - Question 1

Autotrophic thallophytes are called as:

Detailed Solution for Test: Algae - 1 - Question 1
  • Autotrophs: The term "Autotrophs" refer to organisms, that can produce their own food from the inorganic substances found in the surroundings.
  • Algae: Algae which are predominantly aquatic organisms carry out photosynthesis to prepare their food.
  • These fresh water, brackish and marine water inhabitants with no differentiation of stem, roots and leaves make use of the chlorophyll and other photosynthetic pigments present in their thallus for photosynthesis.

Hence, the correct answer is Option C

Test: Algae - 1 - Question 2

Which of the following is parasitic algae:

Detailed Solution for Test: Algae - 1 - Question 2
  • Cephaleuros: Cephaleuros, genus of thalloid algae with 14 species is a parasitic algae,  that infect plants and causing red rust. This grows as a parasite on important economic plants and trees such as tea, mango, coffee and guava. 
  • Harveyella: Harveyella is a colorless red algae, which lacks photosynthetic pigments and hence live as parasites on other photosynthetic red algae.

Hence, the correct answer is Option C

Test: Algae - 1 - Question 3

Red algae is red due to the presence of:

Detailed Solution for Test: Algae - 1 - Question 3
  • R-Phycoerythrin is a protein that belongs to the phycobiliprotein family and acts as an accessory pigment for photosynthesis in Rhodophyta.
  • The red pigment R-phycoerythrin can absorb the blue-green spectrum of light from the deep seas along with chlorophyll-a for photosynthesis.
  • In deep waters, more phycoerythrin is formed as compared to chlorophyll making the red algae look more red.

So, the correct answer is option B.

Test: Algae - 1 - Question 4

Carpogonia is the female sex organ in which of the algae?

Detailed Solution for Test: Algae - 1 - Question 4

Rhodophycophyta reproduce sexually heterogamously by the union of well-differentiated nonmotile male and female germ cells, the spermatia and carpogonia (female sex organs), respectively.
So, the correct answer is option D.

Test: Algae - 1 - Question 5

Protonema occurs in the life cycle of

Detailed Solution for Test: Algae - 1 - Question 5

Protonema represents the juvenile stage of moss (funaria). It is much-branched, green filamentous structure formed by the germination of spores, under favourable conditions.
The protonema consists of:
(a) some slender rhizoids.
(b) a number of aerial green prostrate branches bearing small lateral buds which grow up into new moss gametophores.
Hence, the correct answer is Option B

Test: Algae - 1 - Question 6

"Red rust of tea" is caused by parasitic:

Detailed Solution for Test: Algae - 1 - Question 6

Red rust disease of tea is caused by an alga Cephaleuros parasiticus Karst. The genus Cephaleuros is a parasitic green alga belonging to the family Trentepoholiaceae of the Division Chlorophyta in the algal kingdom.

Test: Algae - 1 - Question 7

Which algal groups have similarity in pigment composition?

Detailed Solution for Test: Algae - 1 - Question 7

Kelps belong to brown algae which carry almost the same pigments as in diatoms. one of them is fucoxanthin.

Test: Algae - 1 - Question 8

No Zoospore formation has been observed in the Algal members belonging to:

Detailed Solution for Test: Algae - 1 - Question 8
  • Brown algae (Phaeophyceae) are characterized by the presence of motile reproductive phase (zoospores) with two lateral flagella.
  • Green algae (Chlorophyceae) reproduce by zoospores with two identical anterior flagella.
  • Xanthophyceae is characterized by the formation of zoospores with paired flagella with unequal length.
  • Cyanophycean reproduce by simple division/fragmentation or nonmotile spores and do not exhibit any motile phase during the life cycle.
Test: Algae - 1 - Question 9

Plants which are not differentiated into roots, stem and leaves are grouped under

Detailed Solution for Test: Algae - 1 - Question 9

Thallophyta is that phylum of plant in which the thallus(body) is not differentiated into leaves, or stem, etc. They do not have a vascular bundles also.

Test: Algae - 1 - Question 10

Sargasso sea is named after an algae Sargassum which is a

Detailed Solution for Test: Algae - 1 - Question 10

Sargassum is a kind of brown algae which is a free floating algae. It has also got a name Gulf weed due to this property. It grows rapidly in North Atlantic ocean and covers thousands hectares of area, therefore this region is called as Sargasso Sea.

Test: Algae - 1 - Question 11

Zygotic meiosis is characteristic of:

Detailed Solution for Test: Algae - 1 - Question 11

Zygotic meiosis is a characteristic feature of Algae or Thallophytes.
So here are a few points about Zygotic meiosis:

  1. This process takes place in the Zygote.
  2. Haploid organism is formed by this process.
  3. This cycle is Haplontic.
Test: Algae - 1 - Question 12

Photosynthetic pigments common to all algae :-

Detailed Solution for Test: Algae - 1 - Question 12
  • Chlorophyll a acts as a reaction center and carotene shows a wide range of light absorption for photosynthesis.
  • In all algae, chlorophyll-a acts as a reaction center which absorbs light energy and converts it into chemical energy which makes photosynthesis possible.
  • Carotene and chlorophyll-a molecules are water insoluble and remains attach to the cell.
  • Carotene absorbs light energy and transfer it to chlorophyll a as they cannot directly transfer it to photosynthetic pathway.
  • Carotene are orange yellow red color pigments which shows a wide range of light absorption in photosynthesis.

Other options: 

  •  Chlorophyll b occurs only in green algae and plants.
  • Xanthophyll occurs only in Phaeophyta (brown algae) and Chlorophyta (green algae). 
Test: Algae - 1 - Question 13

Cyanobacteria are classified under

Detailed Solution for Test: Algae - 1 - Question 13

Cyanobacteria are classified under Kingdom Monera.
(i) Protista— unicellular eukaryotes
(ii) Plantae, all members of Kingdom Plantae are eukaryotic chloroplast chlorophyll containing organisms commonly called plants. These are autotrophic/holophytic.

Test: Algae - 1 - Question 14

Deepest algae in sea are :-

Detailed Solution for Test: Algae - 1 - Question 14
  • Red algae is sitted in benthic zone of sea.
  • For photosynthesis they need blue light instead of red light and deep in the sea blue light is able to reach there and red light is absorbed only till a few meters in water.
Test: Algae - 1 - Question 15

 Phycobilins are characteristic pigments of :-

Detailed Solution for Test: Algae - 1 - Question 15

The two classes of phycobilins include phycocyanin and phycoerythrin. Phycocyanin is a bluish pigment found in primarily cyanobacteria (blue-green algae) to aid in absorption of light in photosynthesis, while phycoerythrin is a pigment found in Rhodopyta (red algae) that is responsible for its characteristic red color.

Test: Algae - 1 - Question 16

Which of the following plant groups have similar pigment composition :-

Detailed Solution for Test: Algae - 1 - Question 16

Both groups have Chlorophyll 'a' and similar accessory pigments such as β- carotenes, and phycobiliproteins. Both groups show thylakoids which occur singly as opposed to the stacked arrangement seen in other algal groups. Major food reserve of Cyanobacteria and Rhodophycean starch are quite similar to each other. Both groups have no flagellate forms.

Test: Algae - 1 - Question 17

Polyuronic acid and polysulphate esters are characteristic in cell wall of :-

Detailed Solution for Test: Algae - 1 - Question 17
  • The vegetative cell has a cellulosic wall usually covered on the outside by a gelatinous coating of algin. On the cell wall of brown algae, some colloid substances like fucinic acid, alginic acid and fucoidan are present which are known as hydrocolloids.
  • The cell wall of red algae is complex and made up of cellulose & pectin. The cell wall of red algae is also complicated like blue-green algae. Their cell wall has many different types of substances such as xylan, galactose, polyuronic acid, polysulfate esters.
  • In dinoflagellates, cell wall has a stiff cellulose plate on the outer surface.
  • In diatoms, the cell wall is made up of silica (hydrated silicon dioxide) called as frustule. They are the major group of algae, most common Chrysophytes.
Test: Algae - 1 - Question 18

Stone wort is common name of :–

Detailed Solution for Test: Algae - 1 - Question 18

Stonewort the common name for the brittle, calcified plants of the Charophyta; Chara and Nitella are the commonest British genera. The plant consists of a ‘stem’ or axis which bears whorls of branches at intervals (nodes) along its length. The axis is attached at its base to the substratum by means of branched rhizoids.

Test: Algae - 1 - Question 19

Irish moss, is a member of :–

Detailed Solution for Test: Algae - 1 - Question 19

Irish moss is a member of the red algae group.

It grows in cold water and is used in raw food recipes for nutrition and thickening properties. Irish Moss has been used for centuries in Ireland, thought it also grows in Asia and the oceans of North America. Raw foodists love Irish Moss for its use as a thickener, so it is a great addition to a raw vegan diet.

Test: Algae - 1 - Question 20

Flagellated cells are absent in :-

Detailed Solution for Test: Algae - 1 - Question 20
  • Cytological structure of all the above options revealed that they lack flagella. 
  • Red alga is eukaryotic without flagella, centrioles, with phycobiliproteins and chloroplast lacking external endoplasmic reticulum and unstacked thyllakoid. 
  • Cyanobacteria do not have organs for movement such as flagella, but some filamentous BGA exhibit gliding movement due to slime secretion along with contractile waves in the cells.
  • In case of higher seed plants (Spermatophyta) like gymnosperm and angiosperm, flagella are absent since, presence of pollen grain eliminated use of water for fertilization. 
Test: Algae - 1 - Question 21

Which of the following is colour less parasitic red algae :-

Detailed Solution for Test: Algae - 1 - Question 21
  • Red algae are also known as rhodophytes, which is are eukaryotic alga without flagellate of which around 7000 living species are known till now. Red algae are marine species.
  • Since they doesn't have flagella so motile stage is absent.
  • It varies from unicellular to complex-multicellular algae.
  • Most of them are autotropic except Harveyella which is a colorless parasitic red alga. 
  • Harveyella cells show secondary pit connections with other parasitic cells or host.
  • Mostly Harveyella is parasitic over Polysiphonia.
Test: Algae - 1 - Question 22

Green algae are considered as ancestors of  higher plants due to their resemblance with higher plants in :-

Detailed Solution for Test: Algae - 1 - Question 22

The correct answer is 'D' because the green algae consist of green pigment for photosynthesis, cell wall to protect from outer environment as it is present on the root nodes and, store water and then supplies to the plant.

Test: Algae - 1 - Question 23

The pyrenoids are made up of

Detailed Solution for Test: Algae - 1 - Question 23

Pyrenoids consist of dense proteinaceous area surrounded by starchy sheath. These are unique to chloroplast of algae and are associated in polymerising sugars into reserve polymers (starch).

Test: Algae - 1 - Question 24

In chlorophyta the mode of sexual reproduction is :-

Detailed Solution for Test: Algae - 1 - Question 24
  • Chlorophyta reproduce both sexually and asexually, but usually sexually.
  • Asexual reproduction can occurs by fission, fragmentation, or zoospores.
  • Sexual reproduction can be isogamous, anisogamous, or oogamous.
  • In the haploid phase, gametes are formed; in the diploid phase, zoospores are formed.
Test: Algae - 1 - Question 25

 The name "Thallophyta" was coined by:-

Detailed Solution for Test: Algae - 1 - Question 25

The term Thallophyta was coined by Endlicher. The organisms included in Thallophyta are algae, fungi, slime mould and bacteria. 

Test: Algae - 1 - Question 26

Who is popularly known as the "Father of Phycology''

Detailed Solution for Test: Algae - 1 - Question 26

F.E. Fritsch (1935) divided algae into following eleven classes in his book "Structure and Reproduction of the Algae", mainly on the basis of pigmentation, reserve food and flagellation, thallus structure, modes of reproduction and life cycles and he is known as father of algae.

Test: Algae - 1 - Question 27

In thallophyta main plant body is:-

Detailed Solution for Test: Algae - 1 - Question 27

In thallophytes, plant body is simplest of all and is not differentiated into root, stem and leaf. Such a body is called as a thallus. Reproductive parts are unicellular and the main plant body is gametophyte.

Test: Algae - 1 - Question 28

The characters of thallophyta is/are :-

Detailed Solution for Test: Algae - 1 - Question 28

Characteristics of Thallophyta :

  • Do not have well differentiated body .
  • They are having thalloids i.e. root and stem .
  • Vascular system is absent i.e. conducting tissues are absent.
  • They are aquatic plants.
  • Spores are present.
  • The sex organs are unicellular and when multicellular, all are fertile.
  • Example - Ulva , Chara , Spirogyra etc.
Test: Algae - 1 - Question 29

Sexual reproduction in Thallophyta takes place by:-

Detailed Solution for Test: Algae - 1 - Question 29
  • Thallophyta reproduce sexually when gametes fuse to form a zygote. 
  • There are three types of sexual reproduction on the morphological and physiological behavior gametes.
  • Isogamous: both the gametes are morphologically and physiologically similar and their fusion is called as isogamy. 
  • Anisogamous: The microgamete is smaller and more active, whereas the female gamete is larger and sluggish and their fusion is called as anisogamy. 
  • Oogamous: female gamete is large and nonmotile and male gamete is small and motile and their fusion is called as oogamy.

Thus, the correct and answer is option D.

Test: Algae - 1 - Question 30

Most advanced group of Algae is :-

Detailed Solution for Test: Algae - 1 - Question 30
  • Chlorophyceae (belongs to Chlorophyta) stands nearer the main lines of evolution towards land plants than any other algal class because of the presence of photosynthetic pigments chlorophyll a and b, starch as reserve product and cellulosic cell walls.
  • Chlorophyta or Prasinophyta is a taxon of green algae informally called chlorophytes.
  • The name is used in two very different senses, so care is needed to determine the use by a particular author. 
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