Tag: algae: benefits and harmful effects

Questions Related to algae: benefits and harmful effects

Jhoomar has a water sample which has green colour scum over it. Which of the following microorganism can be observed in the given sample under a microscope?

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Algae

  2. Virus

  3. Bacteria

  4. None of the above

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Correct Option: A
Explanation:

  • One can clearly found algae in a waterbody as algae are found in a large range in aquatic habitats. 
  • They are able to prepare their own food by the process of photosynthesis by the help of chlorophyll which gives green colour to algae. 
  • Hence the green colour scum is visible over water bodies.
  • The correct answer is A. 

Which of the following helps in the breeding of mosquitoes?

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Algae growing in the pond

  2. Algae growing on the on wall

  3. Algae growing in the river

  4. None of the above

Show answer
Correct Option: A
Explanation:
Mosquitoes lay their eggs in standing water where the larvae hatch and feed before pupating and emerging as adults. The larvae come to the surface of the water to feed and breathe and then hide from predators under vegetation in your pond. Ponds can be an ideal breeding ground for mosquito larvae. The larva from the eggs feed on algae present in the pond.

So, the correct answer is 'A'.

Each cell of Volvox colony has a structure, similar to

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Ulothrix

  2. Spirogyra

  3. Chlamydomonas

  4. Nostoc

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Correct Option: C
Explanation:

Volvox is colonial green alga. The cells are like unicellular alga Chlamydomdnas and are definitely organised in the form of a colony called coenobium. 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 cell.

What are algae helpful for?

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Turbidity

  2. Hydrography

  3. Self Purification

  4. Decomposition

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Correct Option: C
Explanation:

Algae have become significant organisms for self purification of wastewater since they are able to accumulate plant nutrients, heavy metals, pesticides, organic and inorganic toxic substances and radioactive matters in their cells or bodies.

Therefore C is the correct option. 

Identify the non embryonic plant.

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Spirogyra

  2. Ulva

  3. Ulothrix

  4. All of these

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Correct Option: D
Explanation:

Non-embryonic plants are included under the division Thallophyta. In non-embryonic plants, the zygote or the fertilized egg does not form the embryo. It directly forms a new plant. It mainly includes algae such as Spirogyra, Ulothrix, and Ulva. Hence, all the given options are correct.

Which pigment is absent in chloroplasts?

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Xanthophyll

  2. Anthocyanin

  3. Chlorophyll-b

  4. Carotene

Show answer
Correct Option: B
Explanation:
 Xanthophyll It is a yellow colour pigment found in the stroma region of the chloroplast.
 Anthocyanin It is mainly found in the cell vacuole, especially in fruits and flowers.
 Chlorophyll - b It is a green colour pigment and found in the thylakoid region of the chloroplast.
 Carotene  It is an orange colour pigment and found in the stroma region of the chloroplast.

So, the correct answer is ' Anthocyanin'.

Which type of organism, live in the body of termites and digest wood cellulose converting it to soluble carbohydrates?

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Algae

  2. Fungi

  3. Protozoa

  4. Nematoda

Show answer
Correct Option: A
Explanation:

Algae are hte diverse group of aquatic organisms that have the ability to conduct photosynthesis.Certain algae are familiar to most people;for instance seaweeds, pond scum or the algal blooms in the lakes.

So, the correct option is 'Algae'.

Haplontic life cycle generally occurs in ______________.

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. most algae

  2. bryophytes

  3. pteridophytes

  4. gymnosperms

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Correct Option: A
Explanation:

Haplontic life cycle generally occurs in most algae such as volvox, Spirogyra and some species of Chlamydomonas.

So the correct option is A.

Diatomaceous earth is used for all except

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. polishing

  2. filtration of offs and syrups

  3. making sound and fire proof rooms

  4. biogas production

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Correct Option: D
Explanation:

 The cell walls of diatoms are embedded with silica and thus the walls are indestructible. Thus, diatoms have left behind a large number of cell deposits in their habitat; this accumulation over billions of years is referred to as 'diatomaceous earth'. Being gritty this soil is used in polishing, filtration of oils and syrups.

So the correct option is "biogas production".

Eutely means ....................

evs a treat for mosquito algae: benefits and harmful effects basics of algae types of microorganisms

  1. Variable muscle cells

  2. Variable locomotion

  3. Constant number of cells or nuclei in individuals of a species or in parts of their bodies

  4. Strictly marine nature

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Correct Option: C
Explanation:

The constant number of cells or nuclei in individuals of a species or in parts of their bodies is known as eutely.

 The largest group of animals exhibiting eutely are the nematode worms, one of the largest of all animal phyla, and of great medical and agricultural importance as parasites of plants, animals, and humans. A plant that exhibits eutely is usually called a coenobium. Many species of semimicroscopic aquatic green algae exist as coenobia, such as the common Volvox and Pandorina.