Class 9th · Biology · Chapter 11
Chapter 11: Biostatistics
Chapter 11 of the Punjab Board Class 9th Biology textbook runs from page 167 to 180 and covers 3 topics. Its exercise has exercise, multiple choice questions, short / constructed response questions and comprehensive questions. Open any of those pages in GenZ Books, tap a question, and the answer is worked from this chapter.
Open Chapter 11 of Biology in GenZ Books
The same Class 9th textbook, page for page. Tap any question and get the answer worked from that chapter — English and Urdu.
Topics in this chapter
- 11.1Introduction of Biostatisticsp. 167
- 11.2Mean, Median, and Modep. 169
- 11.3Bar Chartp. 171
Exercise
- Exercisep. 174
- Multiple Choice Questionsp. 174
- Short / Constructed Response Questionsp. 175
- Comprehensive Questionsp. 175
GenZ Books has 8 questions from this chapter catalogued, each answered from the pages above.
A sample answer from GenZ Books
Solve · page 172: 6. Draw Bars: For each species, draw a bar up to the corresponding number of plants.
Bar graph drawn and labeled
<svg viewBox="0 0 340 240" font-size="13" xmlns="http://www.w3.org/2000/svg"> <defs> <marker id="arrow" markerWidth="6" markerHeight="6" refX="5" refY="3" orient="auto"> <polygon points="0,0 6,3 0,6" fill="currentColor"/> </marker> </defs> <!-- axes --> <line x1="60" y1="200" x2="300" y2="200" stroke="currentColor" marker-end="url(#arrow)"/> <line x1="60" y1="200" x2="60" y2="40" stroke="currentColor" marker-end="url(#arrow)"/> <text x="300" y="215" text-anchor="middle">+x</text> <text x="45" y="40" text-anchor="middle">+y</text>
<!-- y‑axis scale (0‑10 plants) --> <g stroke="currentColor"> <line x1="55" y1="200" x2="65" y2="200"/> <line x1="55" y1="180" x2="65" y2="180"/> <line x1="55" y1="160" x2="65" y2="160"/> <line x1="55" y1="140" x2="65" y2="140"/> <line x1="55" y1="120" x2="65" y2="120"/> <line x1="55" y1="100" x2="65" y2="100"/> <line x1="55" y1="80" x2="65" y2="80"/> <line x1="55" y1="60" x2="65" y2="60"/> <line x1="55" y1="40" x2="65" y2="40"/> </g> <text x="45" y="202" text-anchor="end">0</text> <text x="45" y="182" text-anchor="end">2</text> <text x="45" y="162" text-anchor="end">4</text> <text x="45" y="142" text-anchor="end">6</text> <text x="45" y="122" text-anchor="end">8</text> <text x="45" y="102" text-anchor="end">10</text>
<!-- bars (example data) --> <!-- Species A – 6 plants --> <rect x="90" y="140" width="30" height="60" fill="none" stroke="currentColor"/> <text x="105" y="135" text-anchor="middle">6</text> <text x="105" y="215" text-anchor="middle">Species A</text>
<!-- Species B – 9 plants --> <rect x="150" y="110" width="30" height="90" fill="none" stroke="currentColor"/> <text x="165" y="105" text-anchor="middle">9</text> <text x="165" y="215" text-anchor="middle">Species B</text>
<!-- Species C – 4 plants --> <rect x="210" y="160" width="30" height="40" fill="none" stroke="currentColor"/> <text x="225" y="155" text-anchor="middle">4</text> <text x="225" y="215" text-anchor="middle">Species C</text> </svg>
Scale used: 1 plant = 10 px vertical height.
Construction steps:
- Draw the +x and +y axes with arrowheads.
- Mark the y‑axis in equal intervals (2‑plant steps).
- From the baseline, draw a vertical rectangle for each species whose height equals the number of plants × 10 px.
- Write the species name below each bar and the plant count at the top of the bar.
Check: Verify that the height of each bar corresponds exactly to the given number of plants using the 10 px per plant scale.
AI-generated from the chapter text by GenZ Books. It can make mistakes — check it against your textbook and your teacher.