Explanation: Apple is indeed a false fruit (or accessory fruit) because it develops from the thalamus (receptacle) of the flower, not just the ovary. On the other hand, dates, plums, and grapes are true fruits as they develop from the ovary of the flower after fertilization.

Explanation: Pteridophytes, such as ferns, do contain chlorophyll and can perform photosynthesis. Fungi, on the other hand, do not have chlorophyll. They are non-photosynthetic organisms and obtain their nutrients through absorption, often from decaying organic matter.

Explanation: Litmus paper is made from lichens, a type of organism formed from the symbiotic relationship between fungi and algae or cyanobacteria. Lichens are used to create the natural dye litmus, which is used to test the pH of a solution. The red or blue color of the litmus paper changes depending on whether the solution is acidic or alkaline.

Explanation: Mycology is the branch of botany (and more broadly biology) that deals with the study of fungi. It involves the classification, structure, genetics, and ecological roles of fungi. Fungi include yeasts, molds, and mushrooms, and mycology helps to understand their role in ecosystems, their medicinal uses, and their impact on health and agriculture.

Explanation: Cycas is a living fossil because it is a member of an ancient group of plants that have existed for millions of years and has changed very little over time. They are part of the Cycadophyta, a group of gymnosperms, and are often called "living fossils" because their ancestors existed during the time of the dinosaurs and have survived with very little evolutionary change.

Explanation: Epiphytes are plants that grow on other plants but do not take nutrients from them. They rely on other plants for mechanical support, using the host plant as a structure to grow on. They typically obtain water and nutrients from the air, rain, or surrounding environment, not from the plant they grow on.