Practise 81 real Federal Board questions on Variety of Life from 2023 to 2026. See the answer and explanation as soon as you answer.
Variety of Life is one of the 15 main chapters in our Federal Board FSC Biology question bank (11th class), and about 16% of its real questions come from it. Tayyari Karo has 81 real questions on this chapter from 2023 to 2026; 32 are multiple choice and marked instantly, and the rest are short and long questions with a model answer. By difficulty: 69 medium, 10 easy, 2 hard.
Work through the questions below, then open the explanation for each one. Redo the ones you missed a few days later.
These are real past-paper questions. Think of your answer first, then open the explanation.
Viruses are classified structurally based on:
Answer: B. Shape and nucleic acid type
Viruses are structurally classified according to their capsid shape (helical, polyhedral, complex) and the type of nucleic acid genome (DNA or RNA, single- or double-stranded) they contain.
Which fungus is poisonous?
Answer: D. Amanita
Amanita (e.g. the 'death cap') produces deadly amatoxins; Agaricus and Morchella are edible, and Aspergillus is a common mould, not typically classed as a poisonous mushroom.
Which structure is present in bacteria for movement?
Answer: C. Flagellum
Bacterial flagella are whip-like appendages that rotate to propel the cell; pili are for attachment/conjugation and capsules for protection.
In which phase of bacterial growth, 'only increase in cell size' occurs?
Answer: B. Lag phase
During the lag phase bacteria adjust to the medium and increase in size/metabolic activity, preparing for division, before rapid division begins in the log phase.
Wood produced by the activity of vascular cambium is also called:
Answer: C. Secondary xylem
Vascular cambium produces secondary xylem (wood) towards the inside and secondary phloem towards the outside.
The non-nucleated thick walled cell found in the trichome of Nostoc, associated with nitrogen fixation, is called:
Answer: D. Heterocyst
Heterocysts are specialised, thick-walled, non-nucleated cells in cyanobacterial (Nostoc) filaments that fix atmospheric nitrogen.
State any three general characteristics of Whisk Ferns.
(1) Whisk ferns (Psilotum) lack true roots and true leaves; the plant body consists of simple, dichotomously branching stems. (2) They are homosporous, producing spores in fused sporangia (synangia) at the tips of short lateral branches. (3) They possess rhizoids instead of roots and are considered among the simplest living vascular plants, resembling early fossil vascular plants.
Enlist any six stages of endospore formation in bacteria as a mechanism of survival to withstand unfavourable conditions.
1. DNA replication, giving two copies of the chromosome.
2. An axial filament of the two chromosome copies forms.
3. The cell membrane invaginates, forming a septum separating a small forespore compartment from the mother cell.
4. The mother cell membrane engulfs the forespore, surrounding it with a second membrane.
5. A thick cortex of peptidoglycan is laid down between the two membranes around the forespore.
6. A tough, resistant spore coat forms around the cortex.
7. The mature endospore is released as the mother cell lyses. (Any six.)
| Session | Questions |
|---|---|
| 2026 Annual | 15 |
| 2025 1st Annual | 14 |
| 2025 2nd Annual | 16 |
| 2024 Annual | 22 |
| 2023 Annual | 14 |
81 real Federal Board (FBISE) Biology questions on Variety of Life from 2023 to 2026, for 11th class. Each one shows the session it came from.
No. We could not find an official FBISE marking scheme for these papers, so the answers and explanations are written by Tayyari Karo for practice. Check anything important with your teacher or textbook.
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