Question

Which of the following organisms cannot synthesise food on their own?
a. Ferns
b. Fungi
c. Algae
d. None of the above

Answer 1

Organisms which cannot prepare their own food are considered as heterotrophs they depend on the organisms are the living which make their own food that is heterotrophs which cannot prepare their own food depends directly or indirectly on autotrophs because they do not have photosynthesis mechanism so they cannot synthesise their own food.

Complete answer:

Option A: ferns-
Ferns are plants which have photosynthetic organs such as chlorophyll as most of the land living plants hence they can prepare their own foods ferns are mostly seen on the top of rocks or near the shore hence day required proper moisture for which the mechanism is developed 2 withstand the moisture and to prepare their own food by the photosynthesis mechanism.

Option B: fungi-
Fungi directly or indirectly depend on the source which prepare their own food because Fung I do not have photosynthetic organelles to prepare RC size food by themselves hence they depend on plant sources or grow on plans to absorb food nutrients from them

Option C: algae-
Algae has the capability to undergo photosynthesis because it contains green pigment called chlorophyll hence in the presence of light and carbon dioxide and water the chlorophyll activate itself and perform photosynthesis to produce glucose and oxygen within the body hence Algae comes under autotrophs because they prepare their own food

Hence, the correct answer is option (B).

Note: Heterotrophs are called consumers because they do not contain the mechanism to prepare their own food just as humans; they depend on producers such as autotrophs to get energy for the growth and survival.