Which activity is NOT an example of heterotrophic nutrition?

A. An algae cell synthesizes food during photosynthesis.

B. A tapeworm absorbs food in a human intestine.

C. A mushroom decomposes a dead log.

D. An eagle kills and eats a snake.

A. An algae cell synthesizes food during photosynthesis

Explanation:

Food is an important substance for the survival of an organism as it is the source of energy. Organisms obtain their food via different means viz: Autotrophism and Heterotrophism.

Heterotrophic nutrition is that kind of nutrition in which certain organisms obtain their food by feeding on other organisms due to their dependence on them. Organisms that employ this mode of nutrition are called HETEROTROPHS. Heterotrophic nutrition can either be saprophytic (feed on dead matter), parasitic (obtaining food from another living organism), or holozoic (feed on solid matter).

Autotrophism, on the other hand, involves synthesizing organic form of food by the organism through the process of photosynthesis. AUTOTOPHS like plants, algae, some bacteria carry out this form of nutrition.

Based on these description, an algae cell synthesizes food during photosynthesis is not heterotrophic but rather autotrophic. The other three options: A(parasitism), B(saprophytism), C(holozoic, carnivorous) depict heterotrophic nutrition.

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

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