The correct option is B. Is a plant. Explanation of the Correct Answer Mucor and Rhizopus are genera of fungi, not plants. They belong to the kingdom Fungi, which is distinct from the kingdom Plantae. Here’s a detailed breakdown of why option B is incorrect:

1. Classification of Mucor and Rhizopus:
2. Mucor and Rhizopus are classified as fungi. They are part of the phylum Zygomycota (or Mucoromycota in some classifications). Fungi are eukaryotic organisms that are heterotrophic, meaning they obtain their food by absorbing nutrients from their environment, unlike plants, which are autotrophic and produce their own food through photosynthesis.
3. Characteristics of Fungi:
4. Fungi have cell walls made of chitin, whereas plants have cell walls made of cellulose. This fundamental difference in cell wall composition is a key distinguishing feature between the two kingdoms.
5. Reproductive Methods:
6. Fungi reproduce through spores, which can be asexual or sexual, while plants reproduce through seeds or spores (in the case of non-flowering plants). Mucor and Rhizopus reproduce asexually through sporangiospores and sexually through zygospores.

Explanation of the Other Options Now, let’s analyze the other options to understand why they are true: A. Grows on moist dead organic matter: - This statement is true. Mucor and Rhizopus are saprophytic fungi, meaning they thrive on decaying organic matter. They play a crucial role in the ecosystem by breaking down dead plant and animal material, recycling nutrients back into the soil. C. Causes decay of organic matter: - This statement is also true. As saprophytes, Mucor and Rhizopus contribute to the decomposition process. They secrete enzymes that break down complex organic substances into simpler compounds, which can then be absorbed as nutrients. D. Consists of multinucleated hyphae: - This statement is true as well. Mucor and Rhizopus have coenocytic (or aseptate) hyphae, which means their hyphae are not divided into individual cells by septa (cross-walls). Instead, they consist of long, multinucleated cells, allowing for efficient nutrient transport and growth. Summary of Key Points

• Mucor and Rhizopus are fungi, not plants, which makes option B incorrect.
• They grow on moist dead organic matter and are important decomposers in ecosystems.
• They cause decay of organic matter by breaking it down and recycling nutrients.
• Their hyphae are multinucleated and coenocytic, allowing for efficient growth and nutrient absorption.

Revision Summary

• Mucor and Rhizopus are classified as fungi, not plants.
• They thrive on decaying organic matter and play a vital role in nutrient recycling.
• They reproduce through spores and have multinucleated hyphae.
• Understanding the differences between fungi and plants is crucial for biology studies.