Kerala Syllabus Class 6 Basic Science: Chapter 04 Flowering and Fruiting - Questions and Answers | Teaching Manual
ഈ ബ്ലോഗ് അഡ്മിൻറെ രേഖാമൂലമുള്ള അനുമതിയില്ലാതെ ഈ ബ്ലോഗിൽ നൽകിയിരിക്കുന്ന ചോദ്യോത്തരങ്ങൾ, ഇതേരീതിയിലോ പി.ഡി.എഫ് രൂപത്തിലോ, മറ്റേതെങ്കിലും ഡിജിറ്റലോ, പ്രിന്റഡ് ഉൾപ്പെടെയുള്ള ഏതെങ്കിലും രൂപങ്ങളിലേക്കോ മാറ്റി മറ്റൊരു വെബ്സൈറ്റിലോ, ബ്ലോഗിലോ, യുട്യൂബ്, സോഷ്യൽ മീഡിയാ ഗ്രൂപ്പുകളിലോ ഉൾപ്പെടെ ഒരിടത്തും പ്രചരിപ്പിക്കാൻ പാടില്ലാത്തതാകുന്നു.
Std 6: Basic Science Chapter 04: Flowering and Fruiting - Questions and Answers
♦ Some of the flowers seen around you are given in the picture below. Which of these flowers can you identify?
• Mukkutti• Thumpa
• Thottavadi
• Kanikkonna
♦ You know that all flowers are not similar. In which ways are they different? Observe the flowers around you. Identify their diversity and complete the list.
• Thalamus - Provides the seat for other parts of the flower.
• Calyx - Formed of sepals. Protects the flower bud by covering it.
• Corolla - Formed of petals. Gives beauty and charm to the flower.
• Androecium - Formed of stamens. Male reproductive part of the flower.
• Gynoecium - Female reproductive part of the flower. Gynoecium consists of one or more carpels.
♦ Complete Flower
Calyx, Corolla, Androecium and Gynoecium are the four main parts seen in a flower. A flower with all these four parts is a complete flower.
♦ Observe the different types of flowers in your home and school. Record the observations in the table below.
♦ Do all plants flower? Are there non-flowering plants in your home and surroundings? Observe and find out.
Pine, Cycas, Ferns, Aloe vera, Money plant, and small plants like algae.
♦ What are the benefits of flowering in plants?
• Fruit is formed from flower.
• The seed develops inside the fruit
• A new plant arises from the seed
♦ How does a flower produce fruit and seed?
Fruits and seeds are produced from flowers through reproduction.
♦ Which are the reproductive parts of a flower?
Male reproductive organ: Androecium
Female reproductive organ: Gynoecium
♦ Androecium: Androecium is composed of stamens. Stamens have parts called filament and anther. Pollen grains are present in the anther chambers. Pollen grains contain male gametes.
♦ Gynoecium: Gynoecium is the female reproductive part of a flower. The carpel consists of stigma, style and ovary. The egg or female gamete is found within the ovule in the ovary.
♦ Label the parts of a stamen and a carpel in the figure given below.
♦ Which are the parts of a stamen?
filament and anther
♦ Where are pollen grains found?
Pollen grains are present in the anther chambers.
♦ Which are the parts of the carpel?
The carpel consists of stigma, style and ovary.
♦ Where is female gamete seen?
The egg or female gamete is found within the ovule in the ovary.
♦ Given below is a picture showing the longitudinal section of a shoe flower. Label the parts on it.
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♦ Given below is a picture showing the longitudinal section of a shoe flower. Label the parts on it.
| Flower | Observations |
|---|---|
| Lady’s finger | Androecium and gynoecium are found in the same flower |
| Pumpkin | Androecium and gynoecium are found in defferent flowers |
♦ Unisexual and Bisexual Flowers
• Flowers which possess either androecium or gynoecium are unisexual flowers.
eg: Pumpkin
• Bisexual flowers have both androecium and gynoecium in the same flower.
eg: Lady’s finger
♦ Observe the flowers around you and find out the unisexual and bisexual flowers. Write your findings in your Science Diary. Present in the class
| Unisexual Flowers | Bisexual Flowers |
|---|---|
| Bitter gourd | Shoe flower |
| Pumpkin | Oleander |
| Ash gourd | Clitoria |
| Cucumber | Brinjal |
♦ Dioecious and Monoecious Plants
• If the male flowers and female flowers are found in different plants, such plants are called dioecious plants. Examples of dioecious plants are date palm,
malabar tamarind, nutmeg and papaya.
• Monoecious plants have both male and female flowers in the same plant. Cucumber, pumpkin, ash gourd, snake gourd, coconut etc. are monoecious plants.
♦ What is Pollination?
Transfer of pollen grains from the anther to the stigma is pollination.
♦ What are the reasons for insects and birds getting attracted to flowers?
Insects and birds are primarily drawn to flowers for their nectar and pollen, which serve as a source of food.
♦ How do flowers benefit when they collect honey from the flowers? Do they help to pollinate flowers?
When they collect honey from the flowers, they carry pollen from one flower to another, helping plants to reproduce.
♦ Do plants pollinated in this way require factors such as colour, nectar, and fragrance to attract pollinators?
• Flowers that are bright in colour attract birds and other insects.
• Some flowers have fragrance to attract insects.
• The foul odour in some flowers attracts flies.
• Small flowers grow as inflorescence to attract pollinators.
• The leaves surrounding some flowers change colour and appear like the flower to attract pollinators.
♦ Which are the pollinators you have come to know about so far?
• Insects
• Birds
• Water
• Wind
♦ Formulate a definition for pollinators.
Factors that help in the process of pollination are called pollinators.
♦ Observe the figures and understand the different methods by which pollination is made possible.
• Figure 1: Pollen grains transfer to the same flower.
• Figure 2: Pollen grains are transferred to another flower of the same plant
• Figure 3: Pollen grains are transferred to another flower of another plant of the same species.
♦ Self-Pollination
Transfer of pollen grains to the stigma of the same flower or the stigma of another flower of the same plant is self-pollination.
♦ Cross-Pollination
Cross-pollination is the transfer of pollen grains from one flower to the stigma of a flower of another plant of the same species.
♦ In the figures, you have observed in which flowers does self-pollination take place? In which flower does cross-pollination take place? Find and write.
• Figure 1: Self-Pollination
• Figure 2: Self-Pollination
• Figure 3: Cross-Pollination
♦ Analyse the given statements regarding pollination. Put (✓) mark against the correct one.
• In dioecious plants, only cross-pollination takes place. (✓)
• In monoecious plants, only cross-pollination takes place (X)
• Both self-pollination and cross-pollination take place in bisexual flowers. (✓)
♦ What happens to the pollen grain after pollination?
After pollination, the pollen grain grows down through style towards the ovary in the form of a tube.
♦ How does the male gamete reach the ovary?
Male gamete reaches the ovary through pollen tube and fuses with the egg.
♦ What is fertilisation?
The process of fusion of male gamete and egg to form zygote is called fertilisation.
♦ By which name is the fertilised egg known?
The fertilised egg is known as zygote.
♦ The picture shows the changes in the tomato flower after fertilisation. 
Analyse the pictures and find out the changes that occur to the parts mentioned below.
• Petals - Wither off
• Sepals - May fall off or remain as part of the fruit base
• Pedicel - grow stronger and support fruit.
• Ovary - Develops into the fruit
• Androecium - Wither and fall off after pollination
♦ What changes occur in all flowers after fertilisation?
After fertilisation, the zygote becomes the embryo, the ovule becomes the seed, and the ovary becomes the fruit.
♦ What is simple fruit?
A simple fruit is a fruit that is formed from a single flower which has only one ovary.
eg: bitter gourd, mango, lady’s finger, pea, papaya etc.
♦ What is aggregate fruit?
If a flower has more than one ovary, it will produce more than one fruit. A fruit that develops from a single flower with multiple ovaries is called an aggregate fruit.
eg: Custard apple, Blackberry, Polyalthia fruit
♦ What are multiple fruits?
Fruits formed from an inflorescence are combined together to a single fruit. Such fruits are called multiple fruits.
eg: Pineapple, wild jackfruit, breadfruit.
♦ What are Pseudo Fruits?
In normal flowers, the ovary develops into fruit. Sometimes, parts of the flower other than the ovary also become fruit. These are pseudo-fruits.
eg: In cashew the pedicel develops into fruits.
In apple and sabre jelly, the thalamus grows into fruits.
♦ Classify and tabulate the following fruits.
Mango, Pineapple, Papaya, Custard apple, Cashew apple, Strawberry, Guava,
Rose apple, Polyalthia fruit, Apple, Breadfruit, Jackfruit.
♦ How do flowers benefit us? Complete the word sun given below
Flower farming or floriculture is the process of developing, growing and nurturing flowering and ornamental plants commercially.
♦ What are the uses of flowers?
• Beautifies the environment
• Supports pollinators
• Gives mental pleasure
• Generates income
• Encourages tourism
• Used in perfumes and cosmetics
• Cultural and religious importance
• Promotes eco-friendly farming
• Used in celebrations
• Job opportunities
• For making medicines
• Can be sold for money
• Used to make Dyes and oils
♦ Which are the commercially grown flowering plants?
• Rose
• Anthurium
• Lotus
• Jasmine
• Orchid
• Marigold
• Sunflower
• Oleander
• ixora
Let’s Assess
1. Compare the flowers and fruits of mango, banana and jackfruit plants and write the differences.
Answer:
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a) It is a monoecious plant.
b) Coconut has separate male and female flowers.
c) Coconuts are produced from female flowers.
d) Androecium and gynoecium are present in the same flower.
Answer: d) Androecium and gynoecium are present in the same flower.
3. Draw and match the correct ones.
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