Which of the following organisms shows a parasitic nutritive strategy?

Correct option is B

The correct answer is (b) Cuscuta

Explanation: Cuscuta, also known as dodder, is a parasitic plant that obtains its nutrients by attaching itself to the host plant and absorbing nutrients directly from it.

Unlike other organisms listed, Cuscuta does not perform photosynthesis and relies on its host for sustenance, making it a parasitic organism.

Here's how it works:

1. Attachment to Host: Cuscuta plants have specialized structures called haustoria, which they use to attach to a host plant. The haustoria penetrate the host plant's tissues, forming connections with its vascular system (xylem and phloem).

2. Nutrient and Water Uptake: Once attached to the host plant, the dodder draws water, minerals, and organic nutrients (like sugars) from the host plant’s vascular system. This parasitic interaction allowsCuscutato survive and grow without the need to produce its own food through photosynthesis.

3. Loss of Photosynthesis: As it matures, Cuscuta typically loses its chlorophyll and becomes entirely dependent on the host plant for nourishment.

Other options:-

• Amoeba is a protozoan that feeds by engulfing food particles through phagocytosis (not parasitic).
• Mushrooms are saprophytic fungi, which means they feed on decaying organic matter, not parasitic.
• Yeast is a type of fungus, but it primarily exhibits saprophytic or mutualistic behavior (such as in the case of yeast in the human gut or fermentation) rather than parasitism.​