This MCQ module is based on: Fruit Seed
TOPIC 18 OF 45
Fruit Seed
🎓 Class 11
Biology
CBSE
Theory
Ch 5 – Morphology of Flowering Plants
⏱ ~14 min
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Fruit Seed
5.8 The Fruit
The fruit is a characteristic feature of flowering plants (angiosperms). It is a mature or ripened ovary, developed after fertilisation. If a fruit is formed without fertilisation of the ovary, it is called a parthenocarpic fruit. e.g., banana.
A fruit consists of a wall or pericarp and seeds. The pericarp may be dry or fleshy. When fleshy, pericarp is differentiated into:
- Epicarp — outer skin
- Mesocarp — middle layer (often fleshy)
- Endocarp — innermost (sometimes hard, stony)
5.8.1 Drupe — A Classic Example
In mango and coconut the fruit is known as a drupe. They develop from monocarpellary superior ovaries and are one-seeded. In a mango, the pericarp is well differentiated into outer thin epicarp, middle fleshy edible mesocarp, and inner stony hard endocarp. In coconut, the mesocarp is fibrous (coir).
5.8.2 True vs False Fruits
A fruit derived from the ovary alone is called a true fruit (mango, tomato). When other floral parts (mainly thalamus) participate in fruit formation, it is a false fruit. e.g., apple, strawberry, cashew — the fleshy edible portion is the swollen thalamus, not the ovary.
5.8.3 Types of Fruit
| Type | Origin | Examples |
|---|---|---|
| Simple | From a single ovary of one flower (mono- or multicarpellary syncarpous) | Mango (drupe), tomato (berry), pea (legume), wheat (caryopsis) |
| Aggregate | From multicarpellary apocarpous ovary — each carpel forms a fruitlet | Polyalthia, lotus, strawberry |
| Multiple/Composite | From the entire inflorescence (cluster of fused ovaries from many flowers) | Pineapple (Ananas), jackfruit (Artocarpus), mulberry, fig |
5.9 The Seed
The ovules after fertilisation, develop into seeds. A seed is made of a seed coat and an embryo. The embryo is made up of a radicle, an embryonal axis, and one (in monocots) or two (in dicots) cotyledons.
5.9.1 Structure of a Dicotyledonous Seed
The outermost covering of a seed is the seed coat. The seed coat has two layers — outer testa (hard) and inner tegmen. The hilum is a scar on the seed coat through which the developing seeds were attached to the fruit. Above the hilum is a small pore called the micropyle. Within the seed coat lies the embryo, consisting of an embryonal axis and two cotyledons. The cotyledons are often fleshy and full of reserve food (e.g., gram, pea). At the two ends of the embryonal axis are present the radicle and the plumule. In some seeds such as castor, the endosperm formed as a result of double fertilisation is a food storing tissue. In plants such as bean, gram and pea, the endosperm is not present in mature seeds and such seeds are called non-endospermic.
5.9.2 Structure of a Monocotyledonous Seed
Most monocotyledonous seeds are endospermic but some such as orchids are non-endospermic. In the seeds of cereals such as maize, the seed coat is membranous and generally fused with the fruit wall. The endosperm is bulky and stores food. The outer covering of the endosperm separates the embryo by a proteinous layer called aleurone layer. The embryo is small and situated in a groove at one end of the endosperm.
The embryo consists of one large, shield-shaped cotyledon known as scutellum and a short axis with a plumule and a radicle. The plumule and radicle are enclosed in sheaths — coleoptile (covering plumule) and coleorhiza (covering radicle).
Comparison: Dicot vs Monocot Seed
| Feature | Dicot Seed (e.g., bean) | Monocot Seed (e.g., maize) |
|---|---|---|
| Number of cotyledons | Two, often fleshy | One (scutellum) |
| Seed coat | Distinct testa + tegmen | Fused with pericarp (caryopsis) |
| Endosperm | Often absent (e.g., bean) or large (e.g., castor) | Bulky, persistent |
| Aleurone layer | Absent | Present (around endosperm) |
| Coleoptile/Coleorhiza | Absent | Present |
| Hilum + Micropyle | Visible on testa | Hidden inside fused covering |
Interactive: Fruit Identifier
Pick origin and pericarp condition — see what kind of fruit it is:
Fruit type: —
Pick origin and pericarp condition.
Activity 5.3 — Soak and Open a Bean Seed
Setup: Soak a kidney bean (rajma) seed overnight in water. Next day, gently peel off the testa and split the seed.
Predict: What will you see inside? Which part will eventually grow into the shoot? Which into the root?
Outside: Hard testa with a hilum (white scar) and tiny micropyle just above it.
Inside: Two large white cotyledons (food store).
Embryonal axis between cotyledons: tip pointing toward micropyle = radicle (becomes root); tip away from micropyle = plumule (becomes shoot).
Bean is non-endospermic — food has been transferred to the cotyledons during seed maturation.
Worked Examples
Worked Example 1: Identify the False Fruit
In an apple, the edible fleshy part is not derived from the ovary. Identify the type of fruit and the origin of the edible portion.
Apple is a false fruit (also called pome).
The edible fleshy part is the swollen thalamus (not the ovary). The actual ovary forms the inner core surrounding the seeds.
Other examples of false fruits: strawberry (red flesh = thalamus, dots on surface = true fruits), cashew (edible 'apple' = thalamus, true nut = the curved fruit attached below).
The edible fleshy part is the swollen thalamus (not the ovary). The actual ovary forms the inner core surrounding the seeds.
Other examples of false fruits: strawberry (red flesh = thalamus, dots on surface = true fruits), cashew (edible 'apple' = thalamus, true nut = the curved fruit attached below).
Worked Example 2: Pineapple Origin
Why is pineapple called a multiple/composite fruit?
Pineapple develops from an entire inflorescence (sorosis) — many flowers cluster around a central axis. Each "eye" on the surface is one fused fruit derived from one flower in the original inflorescence.
After fertilisation, the ovaries of all the flowers, together with the floral axis and bracts, fuse into one mass — a multiple fruit. Similar examples: jackfruit (sorosis) and fig (syconium).
After fertilisation, the ovaries of all the flowers, together with the floral axis and bracts, fuse into one mass — a multiple fruit. Similar examples: jackfruit (sorosis) and fig (syconium).
Competency-Based Questions
Q1. The pericarp of a mango fruit consists of: L1 Remember
Answer: (a). In mango: thin epicarp (skin), fleshy edible mesocarp, and stony endocarp surrounding the seed — three layers of pericarp.
Q2. The aleurone layer is found in: L2 Understand
Answer: (b). The aleurone layer is the outermost protein-rich layer of the cereal endosperm, just below the pericarp/testa fusion. Secretes hydrolytic enzymes during germination.
Q3. Differentiate parthenocarpic from normal fruits with one example each. L3 Apply
Normal fruit: Develops after fertilisation; contains seeds (e.g., mango, apple).
Parthenocarpic fruit: Develops without fertilisation; usually seedless (e.g., banana, seedless grapes).
Practical use: Parthenocarpy is induced by spraying auxins/gibberellins on flowers — used commercially for seedless tomatoes, watermelons.
Parthenocarpic fruit: Develops without fertilisation; usually seedless (e.g., banana, seedless grapes).
Practical use: Parthenocarpy is induced by spraying auxins/gibberellins on flowers — used commercially for seedless tomatoes, watermelons.
Q4. Analyse: Compare strawberry, raspberry, and pineapple in terms of fruit type and ovary contribution. L4 Analyse
Strawberry (false aggregate): Edible red flesh = thalamus; the dots on surface are tiny achenes (true fruits, each from one carpel of the apocarpous gynoecium).
Raspberry (aggregate): Cluster of small drupelets on a thalamus; each drupelet from one carpel of the same flower's apocarpous gynoecium.
Pineapple (multiple): Develops from a whole inflorescence; each "eye" is from one flower's ovary, all fused together.
Increasing complexity: 1 flower carpels → 1 flower's ovaries → many flowers' ovaries.
Raspberry (aggregate): Cluster of small drupelets on a thalamus; each drupelet from one carpel of the same flower's apocarpous gynoecium.
Pineapple (multiple): Develops from a whole inflorescence; each "eye" is from one flower's ovary, all fused together.
Increasing complexity: 1 flower carpels → 1 flower's ovaries → many flowers' ovaries.
Q5. Create: Design an experiment to test whether seedless fruit production in tomato can be improved by hormone application. L6 Create
Experimental Design:
- Hypothesis: Spraying auxin/GA on emasculated tomato flowers induces parthenocarpic seedless fruit set.
- Materials: Tomato plants (same variety, same age), spray bottles, hormone solutions (IAA at 50, 100, 200 ppm; GA3 at same levels), tweezers for emasculation.
- Treatments: (i) Emasculated only (control); (ii) Emasculated + IAA spray; (iii) Emasculated + GA3 spray; (iv) Pollinated normally.
- Measurements: Fruit set %, fruit weight, seediness, days to ripening.
- Replicates: 10 flowers per treatment x 5 plants.
- Expected: Treatments (ii) and (iii) should set fruits without seeds; (i) should mostly drop flowers.
Assertion–Reason Questions
Choose: (A) Both true, R explains A. (B) Both true, R doesn't explain A. (C) A true, R false. (D) A false, R true.
A: Apple is a false fruit.
R: The fleshy edible part of apple develops from the thalamus and not from the ovary.
Answer: (A). Both true; R correctly explains A. False fruits are those in which structures other than the ovary contribute to the fleshy part.
A: Maize seed is a caryopsis.
R: In maize, the pericarp and seed coat are completely fused.
Answer: (A). Both true; R explains A. A caryopsis is a one-seeded dry indehiscent fruit where the pericarp is fused with the seed coat — characteristic of grasses (maize, wheat, rice).
A: Bean is a non-endospermic seed.
R: Endosperm is completely consumed by the developing embryo and food is stored in the cotyledons.
Answer: (A). Both true; R explains A. In non-endospermic seeds (bean, pea, gram), the endosperm is absorbed by the cotyledons during seed development; mature seed has thick fleshy cotyledons as food reserve.
Frequently Asked Questions - Fruit Seed
What is the main concept covered in Fruit Seed?
In NCERT Class 11 Biology Chapter 5 (Morphology of Flowering Plants), "Fruit Seed" covers the core biological structures, functions, and classifications students need for board exam success. The MyAiSchool lesson explains the topic with definitions, labelled diagrams, comparison tables, and interactive simulations. Scientific terminology and ecological/physiological significance are highlighted throughout to build conceptual depth aligned with CBSE 2025-26 syllabus.
How is Fruit Seed useful in real-life or applied biology?
Real-life applications of "Fruit Seed" from NCERT Class 11 Biology Chapter 5 include medical diagnostics, agriculture, food preservation, biotechnology, ecological monitoring, and public health. The MyAiSchool lesson links every biological concept to a tangible application so students see biology as a problem-solving framework for living systems, not just textbook content.
What are the key terms students should memorize for Fruit Seed?
Key terms in "Fruit Seed" (NCERT Class 11 Biology Chapter 5 Morphology of Flowering Plants) are tabulated in the MyAiSchool key-terms grid. Students should memorize each term with its precise definition, function, and example. Terminology is high-yield in CBSE board exams — 1-mark MCQs and 2-mark short answers test definitions directly. The Summary section provides a printable quick-reference card.
How does this part connect to other parts of Chapter 5?
NCERT Class 11 Biology Chapter 5 (Morphology of Flowering Plants) is structured so each part builds biological understanding sequentially. "Fruit Seed" connects to neighbouring parts via shared classifications, structural hierarchies, and physiological processes. The MyAiSchool lesson cross-references related concepts with internal links so students can navigate the whole chapter as one connected biological story rather than disconnected fragments.
What types of CBSE board questions come from Fruit Seed?
CBSE board questions from "Fruit Seed" typically include: (1) 1-mark MCQs on definitions and classification, (2) 2-mark short-answer differences/comparisons, (3) 3-mark labelled-diagram questions, (4) 5-mark long-answer essays combining structure + function + significance. The MyAiSchool lesson tags each Competency-Based Question (CBQ) with Bloom level (L1-L6) so students know how to study for each weight.
How can students use the interactive simulation effectively?
The interactive simulation in the "Fruit Seed" lesson allows students to explore biological structures, classifications, or processes using selectors and sliders, with live visual feedback. To use it effectively: (1) explore each option/state, (2) compare with textbook diagrams, (3) note the function changes, (4) try the integrated practice quiz. The simulation reinforces visual-spatial understanding that pure text-based study cannot.
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