Seeds And Seeds

Seeds are tiny, living structures produced by plants. Each seed contains a baby plant (the embryo), stored food (cotyledon or endosperm) and a protective outer layer called the seed coat. When conditions are right, the seed starts to grow into a new plant — this process is called germination.

Important parts of a seed:

• Seed coat: protective outer layer that keeps the seed safe from damage and drying.
• Embryo: the young plant inside the seed; it has a root part (radicle) and a shoot part (plumule).
• Cotyledons / Endosperm: stored food that nourishes the embryo until it can make its own food through leaves.

What seeds need to germinate: water to soften the seed coat and activate growth, oxygen for respiration, and suitable temperature (warmth for most garden seeds). Light may be needed for some seeds, while others germinate best in darkness.

Types of seeds (simple view for Class 5):

• Dicot seeds: have two cotyledons (e.g., beans, peas, mango).
• Monocot seeds: have one cotyledon (e.g., coconut, maize/corn).

How seeds spread (seed dispersal): seeds travel from the parent plant to new places by wind (e.g., cotton, dandelion), water (e.g., coconut), animals (inside or stuck on fur, or eaten and passed out), and mechanical methods (pods that burst and scatter seeds).

Why seeds are important: they help plants reproduce, provide food (rice, wheat, pulses, nuts), spices, oils (mustard, sesame), and are used for planting to grow crops and trees.

Simple activities: observe seed germination by placing a few seeds (bean/gram) on a wet cotton in a transparent cover; note root and shoot growth over days.

What is a seed? A seed is a young plant (embryo) packed with stored food and covered by a protective coat. When conditions are right (water, air, suitable temperature), the seed germinates and grows into a new plant.

Main parts of a seed and their functions

• Seed coat (Testa): The outer protective layer. It protects the embryo and stored food from damage, pests and drying out.
• Embryo: The tiny, young plant inside the seed. The embryo itself has parts:
  • Radicle: The embryonic root that grows downward to form the root system.
  • Plumule: The embryonic shoot that grows upward to form the stem and leaves.
  • Cotyledons (seed leaves): Leaf-like structures that often store food or help absorb food. In dicots there are two cotyledons; in monocots there is one.
• Food store: Food for the embryo until it can make its own food by photosynthesis. This food may be stored in the cotyledons (common in many dicots like beans) or in a separate tissue called the endosperm (common in monocots like maize, wheat).
• Micropyle: A tiny pore in the seed coat through which water enters at the start of germination.
• Hilum: A small scar on the seed that marks where it was attached to the parent plant (like the belly-button of the seed).

Dicot seeds vs Monocot seeds (simple comparison)

• Dicot seeds (two cotyledons): Example: pea, gram, bean. They usually have two thick cotyledons that store food and an embryo with radicle and plumule.
• Monocot seeds (one cotyledon): Example: maize, wheat, rice. They usually have a single cotyledon and a visible endosperm that stores food.

How parts help in germination

• Water enters through the micropyle and softens the seed coat.
• Stored food in cotyledons or endosperm provides energy for the embryo to grow.
• The radicle emerges first and becomes the root; the plumule follows and becomes the shoot.

Simple classroom note: If you split a bean seed you can see two cotyledons and a small embryo between them. In a maize seed, cutting through shows a single cotyledon and endosperm.

Seeds are the small parts of a plant from which a new plant grows. They contain an embryo (tiny baby plant), one or more cotyledons (seed leaves), and a seed coat that protects them. In Class 5 EVS we group seeds in simple, easy-to-observe ways:

• 1. By number of cotyledons (most common classroom grouping):
  • Monocot seeds — have one cotyledon. Typical features: long and narrow leaves in the adult plant, fibrous roots. Examples: maize (corn), wheat, rice.
  • Dicot seeds — have two cotyledons. Typical features: broad leaves with veins, tap root system. Examples: peas, beans, gram, sunflower.
• 2. By mode of dispersal (how seeds travel away from the parent plant):
  • Wind-dispersed — light or winged seeds that travel by air (e.g., cotton fibres, maple "helicopter" seeds).
  • Water-dispersed — seeds that float and travel in water (e.g., coconut).
  • Animal-dispersed — seeds carried on fur or eaten and passed out by animals (e.g., burdock burs, berries like mango).
  • Explosive/mechanical — pods that burst to scatter seeds (e.g., balsam, pea pods sometimes split open).
• 3. By use or size (simple practical grouping):
  • Edible seeds — pulses, cereals, oilseeds (peas, beans, rice, wheat, sunflower seeds).
  • Large seeds — easy to see and plant (coconut, mango, jackfruit seeds).
  • Small seeds — tiny and many (poppy, spinach).

Class activity to identify monocot vs dicot: Soak seeds (e.g., maize and pea) in water for a few hours, carefully cut them open and observe the number of cotyledons and the little embryo parts (radicle and plumule). This shows the difference clearly.

What is germination?
Germination is the process by which a seed starts to grow and develops into a young plant (seedling). A seed which begins to sprout and shows a small root and shoot is said to have germinated.

Parts involved in germination
Inside a seed is an embryo (tiny plant) and food stored in cotyledons or endosperm. The embryo has two main parts: the radicle (future root) and the plumule (future shoot).

Steps of germination

• Imbibition: The seed absorbs water and swells. This is the first and very important step.
• Activation of enzymes: Water activates enzymes which start using the stored food in the seed.
• Food use and growth: Stored food is broken down into simple substances to provide energy and materials for the growing embryo.
• Radicle emerges: The radicle (root) comes out first and grows downward into the soil.
• Plumule emerges: The shoot (plumule) comes out and grows upward toward light to form leaves.
• Seedling stage: Leaves begin to perform photosynthesis and the plant becomes independent of the seed’s stored food.

Conditions required for germination

• Water: Needed for imbibition and chemical reactions.
• Oxygen (air): Required for respiration to release energy for growth.
• Right temperature: Too cold or too hot slows or stops germination; each seed has a suitable temperature range.
• Light or darkness: Some seeds need light to germinate, others need darkness; many common seeds do not require light to start.

Other points
If any of the above conditions are missing, the seed may remain dormant (not germinate) until favorable conditions return. Some seeds also have hard coats and need scarification (scratching) or soaking to allow water in.

Simple experiment for students
Place a few beans on moist cotton in a transparent cup, keep it in a warm place, and observe over several days. You will see swelling, the radicle coming out, then the shoot.

Seed dispersal is the movement of seeds away from the parent plant so they can grow in new places. Plants cannot move, so they use different methods to spread their seeds. Seed dispersal prevents crowding, reduces competition for water, light and nutrients, and helps plants colonise new areas.

Common methods of seed dispersal:

• By wind (anemochory): Seeds are light or have special shapes (wings, hairs) that help them float in air. Example structures: maple samaras, dandelion fluff.
• By water (hydrochory): Seeds that can float travel by water. Example: coconut seeds can float across seas to reach new shores.
• By animals (zoochory): Seeds are carried externally on fur or feathers (epizoochory) or eaten and later dropped in new places (endozoochory). Examples: burs stick on clothes, berries eaten by birds.
• By explosion (ballochory): Some plants burst open and throw their seeds away from the plant. Example: castor and touch-me-not (Balsam).
• By gravity (barochory): Seeds simply fall to the ground and roll away a short distance. Example: many nuts and heavy fruits.

How structure helps dispersal:

• Light, winged or hairy seeds travel farther in wind.
• Water-resistant, buoyant seeds travel by water.
• Attractive, fleshy fruits encourage animals to eat them; seeds pass through stomachs and are dropped with droppings (a ready supply of fertiliser!).
• Burrs and hooks cling to animal fur or human clothing to be carried to new places.

Why seed dispersal is important:

• Reduces competition between parent plant and offspring.
• Helps plants spread to suitable habitats and increases survival chances.
• Maintains plant diversity and helps colonise disturbed areas.

What is a seed and what is a fruit?

A seed is the young plant (embryo) wrapped in a protective covering, formed after fertilization of the ovule inside a flower. A fruit is the mature ovary of a flower that usually develops after fertilization and encloses the seeds.

How are they related?

1. From flower to seed and fruit: After pollination, fertilization happens when a pollen grain fuses with an ovule. The fertilized ovule develops into a seed, and the ovary around the ovule grows into a fruit. In simple form: flower (fertilization) → seed(s) + fruit.
2. Protection: Fruits protect the seeds inside. For example, a mango’s fleshy fruit protects its single large seed (the stone), and a pea pod protects many pea seeds.
3. Nutrition for the embryo: In many seeds, stored food (endosperm or cotyledons) helps the embryo grow when it germinates. In some fruits (like coconut), the fruit tissues also provide food and water to the seed embryo.
4. Dispersal: Fruits help in seed dispersal. The shape, size, and taste of a fruit are adapted to spread seeds by animals (fleshy fruits), wind (winged fruits), water (floating fruits), or by bursting open (pods).
5. Exceptions and special cases: Some fruits are seedless (bananas, some grapes). These form without fertilization (parthenocarpy) or are sterile cultivars. Some structures that look like seeds may be fruits (e.g., sunflower 'seeds' are seeds inside a dry fruit called an achene).

Simple summary: The seed is formed from the ovule and becomes a new plant. The fruit is formed from the ovary and protects and helps spread the seed.

What are seeds? Seeds are tiny structures produced by flowering plants that contain a baby plant (embryo) and food stored inside a protective coat. Seeds help plants to make new plants and spread to new places.

Main uses of seeds

• Food for humans: Many seeds are important foods. Pulses (like gram, lentils), cereals (wheat, rice), and nuts (almonds, groundnut) are seeds or parts of seeds eaten for energy, protein, vitamins and minerals.
• Growing new plants (reproduction): Seeds are planted (sown) to grow crops, vegetables, fruits and flowers. Farmers use seeds to raise the next season’s crop.
• Oils and cooking: Oilseeds such as mustard, sunflower, sesame and groundnut are crushed to make cooking oil and ghee.
• Spices and flavouring: Some seeds are spices (e.g., cardamom, cumin, coriander, fennel) that add flavour to food.
• Medicine and health: Several seeds are used in traditional remedies and modern medicines (for example, fenugreek seeds for digestion; flax seeds for healthy fats).
• Animal feed (fodder): Many seeds and their by‑products are used to feed farm animals.
• Industrial uses and fibres: Seeds like cotton are valuable for fibres (cotton fiber comes from the seed pod) and other seed oils are used in soaps, paints and cosmetics.
• Trade and income: Seeds and seed products (grains, oils, spices) are important for farmers’ income and national trade.
• Conservation and biodiversity: Seeds are stored in seed banks to protect plant varieties and help restore plants in future.

Nutritional role: Seeds are rich in carbohydrates (cereals), proteins (pulses), healthy fats (oilseeds, nuts), and micronutrients (iron, calcium, vitamins). This makes them a key part of a healthy diet.

Simple seed care and everyday use: We eat seeds (rice, wheat, peas), plant seeds to grow kitchen vegetables (tomato, beans), use seeds to extract oil (mustard oil), and save seeds from good plants to plant next year. Seeds are small but very useful in many ways in daily life and farming.

What is saving and storing seeds?
Saving seeds means collecting mature seeds from healthy plants so they can be used for growing plants later. Storing seeds means keeping the collected seeds in a safe, dry and cool place so they remain alive (viable) until planting time.

Why save and store seeds?

• To grow the same good plants next season (taste, yield or colour you like).
• To save money by not buying seeds every year.
• To preserve local or rare varieties and learn about plant life cycles.

How to save seeds (simple steps):

1. Choose healthy plants: Pick strong, disease-free plants with the desired traits (size, colour, taste).
2. Collect at the right time: Wait until seeds or fruits are fully mature. Examples: pods dry and brown on peas/beans; tomato seeds come from ripe, soft tomatoes; sunflower heads dry and seeds loosen.
3. Clean the seeds: Remove pulp, chaff and broken seeds. For wet fruits (tomato), wash and dry seeds on paper. For pods, shell and winnow.
4. Dry the seeds well: Spread seeds in shade or a dry airy place until crisp (not damp). Avoid direct hot sun which can kill seeds.
5. Label: Write seed name, variety and date on a paper label.
6. Store properly: Use airtight containers (glass jars, sealed packets, metal tins). Keep in a cool, dry, dark place. Small packets with silica gel or dry rice can help absorb moisture.
7. Check before use: Do a small germination test before sowing stored seeds to see how many will sprout.

Important rules for good storage:

• Keep seeds dry. Moisture causes mould and rotting.
• Keep seeds cool. Heat reduces seed life.
• Protect from insects (use airtight containers; traditional methods include storing with dry ash or neem leaves).
• Use the oldest seeds first and write dates so you rotate stock.

Types of seeds and special notes:

• Some seeds (beans, peas, most vegetables) stay good 1–3 years if stored well; others (onion, parsnip) lose viability faster.
• Seeds from cross-pollinated plants (like many vegetables and some flowers) may not come true to type; saved seeds may produce different plants.

Simple safety tips: Do not store seeds in damp places (kitchen near stove or bathroom). Use paper envelopes first (they breathe) and then place envelopes inside airtight jars for longer storage.

What planting means
Planting seeds means placing seeds into suitable soil at the right time, depth and spacing so they can absorb water, get oxygen and grow into healthy plants. Good planting improves germination (the seed sprouting) and the final crop.

Steps in planting seeds

• Choose good seeds: Healthy, full, and disease-free seeds give better germination. Farmers often buy certified seeds or save the best seeds from last season.
• Prepare the soil: Remove weeds, loosen the soil and add compost or manure if needed. A fine, crumbly soil helps roots grow.
• Decide planting method: Select a method depending on the crop — broadcasting, dibbling, drilling, or transplanting seedlings.
• Sow at proper depth: A general rule is sow seeds at a depth about 2–3 times the thickness (diameter) of the seed. Tiny seeds are sown very near the surface; large seeds are deeper.
• Maintain proper spacing: Give each seed or seedling enough space so roots and leaves won’t crowd each other. Spacing depends on the plant type (e.g., maize needs more space than carrot).
• Cover and water: Lightly cover seeds with soil or compost, press gently, and water carefully so seeds stay moist but not waterlogged.
• Care after sowing: Keep soil moist until germination, protect from pests and heavy rains, thin extra seedlings if too many sprout in one spot, and transplant if you started seedlings in a nursery bed.

Common planting methods

• Broadcasting: Seeds are scattered over the soil (used for grasses and some vegetables). It is quick but needs thinning later.
• Dibbling/dibbling by hand: Small pits or holes are made and one or a few seeds are placed in each pit (used in home gardens).
• Drilling: Seeds are placed in rows (often by a seed drill) at uniform depth and spacing (used for wheat, rice, maize).
• Transplanting: Seeds are first sown in a nursery or seedbed; seedlings are later moved to the main field (used for rice, tomato, cauliflower).

Why depth, spacing and care matter
If seeds are too deep they may not get enough oxygen or the young shoot may not reach the surface. If too shallow, they can dry out or be eaten by birds. Proper spacing reduces competition for water, sunlight and nutrients, giving higher yield.

Example process for a small garden
Prepare a seedbed, mark rows 20–30 cm apart (for beans), make holes every 10–15 cm, drop 1–2 seeds per hole, cover lightly, water gently and keep moist till seedlings appear.

What is observation? Observation means carefully watching and noting changes in seeds during experiments. In the chapter on Seeds, observation helps us see how seeds swell, split, grow roots (radicle) and shoots (plumule) and become seedlings.

Why observe? Observations tell us what conditions (water, air, warmth, light) help seeds germinate and grow. They teach patience, careful recording and how to draw conclusions from evidence.

Typical steps in an observation activity

• Question or aim: e.g., "Which seed will germinate fastest?"
• Materials: seeds (mung, gram, mustard etc.), cotton/wet tissue, Petri dish/plate, soil/pots, water, ruler, labels, notebook.
• Procedure: label samples, place seeds on wet cotton or in soil, keep one set in light and another in dark (if comparing), water as needed, observe daily at the same time.
• Variables: independent (seed type, moisture, light), dependent (days to germinate, seedling height), controlled (same number of seeds, same temperature if possible).
• Recording: date, day number, number of seeds sprouted, height (cm), color and any other visible changes. Draw simple sketches or take photos.
• Repeat and conclude: do more than one trial to be sure. From observations, decide which conditions were best for germination.

What to look for during observation

• Seed swelling and splitting of the seed coat.
• Appearance of the root (radicle) and shoot (plumule).
• Time (in days) taken for first sprout and for most seeds to sprout.
• Seedling length, leaf shape and color, number of seedlings alive after some days.

Good observation practices: label samples clearly, observe at the same time each day, use a simple table for notes, draw what you see, keep conditions constant for fair comparison, and always wash hands after handling soil or seeds.

This section gives clear meanings of words you meet in the chapter on seeds. Knowing these terms helps you read experiments, describe seeds and explain how plants grow from seeds.

• Seed: A small part of a plant that contains a baby plant (embryo) and food, covered by a protective coat. A seed can grow into a new plant under the right conditions.
• Embryo: The tiny young plant inside the seed. It has beginnings of root and shoot.
• Cotyledon (Seed leaf): The part of the embryo that stores or absorbs food. Seeds may have one (monocot) or two (dicot) cotyledons.
• Seed coat (Testa): The outer protective covering of a seed that prevents drying and injury.
• Endosperm (or stored food): Food stored inside the seed which the embryo uses when it begins to grow.
• Radicle: The part of the embryo that develops into the root.
• Plumule: The part of the embryo that develops into the shoot (stem and leaves).
• Germination: The process when a seed begins to grow into a seedling — the radicle comes out first followed by the shoot.
• Dormancy: A resting period when seeds do not germinate even if conditions are ok. It helps seeds survive bad seasons.
• Monocot: Seeds/seedlings with one cotyledon (e.g., maize, wheat).
• Dicot: Seeds/seedlings with two cotyledons (e.g., pea, gram).
• Dispersal: The ways seeds move away from the parent plant (by wind, water, animals, bursting, or humans).
• Seedling: A young plant that has just grown from a seed.

Short note on conditions for germination: Seeds usually need water to swell and soften the seed coat, oxygen for respiration, and a suitable temperature. Some seeds also need light or darkness to germinate.