ICSE Class 11 Biology — Flashcards for Quick Revision

A: Biology is the science devoted to the study of living organisms. It studies their structure, functioning, diversity, and relationships.

A: Living organisms are self-replicating, evolving and self-regulating interactive systems capable of responding to external stimuli. This means they can maintain internal balance, interact with the envi

A: Metabolism, nutrition, respiration, irritability or consciousness, and adaptation are defining properties of all living beings. These are considered the core signs of life in this chapter.

A: Simple use-based grouping was not enough to classify the huge variety of living organisms. As more microorganisms were discovered, especially bacteria, fungi, slime moulds, and unicellular forms, a cl

A: Aristotle used simple morphological characters. He classified plants into trees, shrubs, and herbs, and divided animals into those with red blood and those without red blood.

A: Linnaeus proposed a two-kingdom system with Plantae and Animalia. Organisms were grouped mainly on the basis of form and constitution. This system was simple, but it could not place bacteria, fungi, a

A: Plant kingdom comprises multicellular, autotrophic organisms. It includes major groups such as algae, bryophytes, pteridophytes, gymnosperms, and angiosperms.

A: Plants probably arose from the algal division Chlorophyta. Green algae are especially close to land plants in their pigments, food storage, and cell wall composition.

A: Cyanobacteria, also called blue-green algae, are not algae any more. They are placed in Monera because they are prokaryotic, unlike true algae which are eukaryotic.