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Plants

Plant reproduction

Plant reproduction on the farm is how a flower becomes a seed, and how some crops are multiplied without seed.

CAPS

Grade 11 · Agricultural Sciences · Plants

Agricultural Sciences splits animals from plants, soil and management.

  • The papers

    Paper 1 is animal nutrition, animal production, reproduction and protection. Paper 2 is soil science, plant studies, and agricultural management. Each paper is 150 marks.

  • How to write it

    Use the farming term, then the reason: a deficient mineral, a symptom, a management practice, and why it changes the yield or the health of the animal. A list with no cause does not explain.

  • How a marker reads it

    A common mix-up is to call pollination the same event as fertilisation, or to call a potato a root.

Data-response questions want you to read the table first. A general paragraph about farming that ignores the numbers scores as if you did not see them.

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Diagram

Worked theory

Worked theory. A pumpkin patch. Bees move pollen from one flower to another. No bees, few fruit, even though the plants flowered. That separates pollination from “the plant tried”. A potato patch next door is not waiting for bees. The tuber is a swollen stem, and each planted piece grows a clone of the parent. Saving pumpkin seed can give you a surprise plant if a neighbour’s variety supplied the pollen. Saving potato tubers does not shuffle the genes. The farmer chooses seed or clone on purpose.

More worked examples

  • One pumpkin, one potato

    Pumpkin flowers open and bees move pollen. No bees that week, and the vines flower with almost no fruit. The pollen never landed. A potato in the next row never opens a flower that matters. You plant a piece of last year’s tuber, an eye with a bud, and the new plant is a copy. Save seed from a pumpkin that was crossed by a neighbour’s variety and the next vine may not look like the parent. Save the potato and it will.

  • A tomato flower

    Pollen lands on the stigma, a tube grows down the style, and the male nucleus fuses with the egg in the ovule. The ovary swells into the tomato. The ovule becomes the seed you see when you slice it. No pollen, no seed, and the fruit is small or absent. The petals attract the bee. They do not become the fruit. A learner who says the petals turn into the tomato has watched the colour and missed the ovary.

In ordinary words

The stamen makes pollen. The pistil receives it. Pollination is pollen landing on the stigma. Fertilisation is the male nucleus joining the egg, later, inside the ovule. The ovule becomes the seed. The ovary becomes the fruit. Self-pollination uses the same plant. Cross-pollination uses another, and needs wind, water or an animal. Cuttings, tubers and grafts copy one parent exactly. Seed does not.

In South Africa

Pumpkins and potatoes in one garden are sexual and asexual reproduction side by side.

Part 1 / 4

What it is

Plant reproduction on the farm is how a flower becomes a seed, and how some crops are multiplied without seed.

Diagram

More worked examples

Board walkthroughs on this topic. Open one, copy the working, then try the next.

Example 1 / 20

Compare sexual and asexual (vegetative) plant reproduction with examples.

How we got there

Read this like a teacher at the board. We go slowly, name every number, and say why we take each step.

Explain in another language · 11

1. What is the question asking?

Read the question twice. Circle the unknown. Underline every number and unit. The paper is asking: Compare sexual and asexual (vegetative) plant reproduction with examples.

In other words — as if you have never seen this before

If you have never seen this before: Seeds vs plant parts. We will name a method in words, write the formula with no numbers, then substitute one line at a time.

2. What do we already know?

Propagation.

3. Which method — and why this one?

Seeds vs plant parts.

4. Step-by-step working

  1. 01 / 07

    Step A — Read the question twice

    Slow down. Circle the word that names the unknown. Underline every number and its unit. Do not grab a formula yet — first decide what the paper is actually asking.

    Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.

  2. 02 / 07

    Step B — Write the given in a column

    Propagation.

    Why this step: A column with units stops you mixing cm with m, or minutes with seconds. Markers can also see you started correctly.

  3. 03 / 07

    Step C — Name the method in words

    Seeds vs plant parts.

    Why this step: If you can say the method in a sentence, you will pick the right formula. First-timers skip this and grab the first equation they remember.

  4. 04 / 07

    Identify the given

    Sexual: seeds from pollination and fertilisation — variation (maize). Asexual: cuttings, grafting, tubers, runners — identical clones (potato tubers, strawberries).

    Why this step: We only do one job per line so a marker can follow the marks — and so you can find a slip without starting over.

  5. 05 / 07

    Step G — Sense-check the size

    Ask: is this the kind of number a Grade 10–12 paper would want? A speed of 3 000 ms for a learner walking, or a probability bigger than 1, means a unit or algebra slip. Estimate first: round the numbers and do the sum in your head.

    Why this step: Markers write ‘unrealistic’ in the margin when the method is right but the size is wild. A 10-second head check often finds a missing 10² or a unit that never changed.

  6. 06 / 07

    Step F — Box the answer with its unit

    Sexual gives variation; asexual gives clones quickly.

    Why this step: A number without a unit is half a mark on a Physics paper, and a marker can miss a Maths answer that is buried in working.

  7. 07 / 07

    Step H — What the marker is looking for

    On an NSC memo you usually earn: (1) a method mark for naming the right formula or idea in words, (2) an accuracy mark for substituting the given numbers with units, (3) an accuracy mark for the boxed answer with its unit. Write those three lines even if you are unsure of the arithmetic — blank pages score zero.

    Why this step: First-timers chase the final number and leave the method blank. The memo still pays out for the idea and the substitution even when the last line is wrong.

5. The answer

Sexual gives variation; asexual gives clones quickly.

Copy onto your answer sheet — in this order

Answer: Sexual gives variation; asexual gives clones quickly.

6. Check it like a marker

Grafting is used for citrus.

7. A trap first-timers fall into

First-timers often grab the first formula they remember, mix units (cm with m, minutes with seconds), or drop a minus sign. Write the formula in words first: “this equals that, because…”

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