"Though they are photosynthetic in presence of sunlight, when deprived of sunlight they behave like heterotrophs by predating on other smaller organisms". This statement is related to

Desmids

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Red dinoflagellates

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Euglenoids

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Slime moulds

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Solution

The correct option is C Euglenoids
A- Desmids are single-celled green algae which can only be found in fresh water. They can be represented by their symmetry.
B- Dino-flagellates are the most common sources of bio-luminescence at the surface of the ocean. They are neither plant nor animal, rather they are unicellular protists.
C- Euglenoids are single celled organism that are mostly autotrophic but they can be heterotrophic. They are both free-living and parasitic. They share the characteristics of both plants and animals.
D- Slime moulds are one of the species of primitive organisms containing true nuclei and resembling both protozoan protists and fungi.
So, the correct option is ' Euglenoids'.

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Similar questions

Q. Which photosynthetic organism behaves like heterotroph in the absence of sunlight ?

Q. Read the following statements regarding euglenoids and select the incorrect ones.
(i) These are mostly freshwater organisms found in stagnant water.
(ii) Their body is covered by a protein rich layer called pellicle which makes their body flexible.
(iii) They are photosynthetic in the presence of sunlight but become heterotrophs in the absence of sunlight.
(iv) They usually possess two flagella, one long and one short.
(v) Euglenoids are multicellular ciliate protists.

Question 1
Which of the following statements about the autotrophs is incorrect?

(a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll.
(b) They store carbohydrates in the form of starch.
(c) They convert carbon dioxide and water into carbohydrates in the absence of sunlight.
(d) They constitute the first trophic level in food chains.

What happens to the water in wet clothes when they are kept in sunlight?

Q. Think and answer.
(a) We prepare a variety of foodstuffs and dishes at home. Are we then autotrophic organisms ?
(b) Which organisms are greater in number - autotrophs or heterotrophs ? Why?
(c) The number of heterotrophs found in desert regions is smaller. However, they are found in greater numbers in the sea. Why is this so ?
(d) What damage or harm do ectoparasitic and endoparasitic animals cause ?
(e) Why is plant food not produced in any other parts of the plant except the green ones ?

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