Q1: What is the main purpose of flowers in a plant? (a) To make the plant look pretty (b) To produce food for animals (c) To help with plant reproduction by forming fruits and seeds (d) To protect the plant from insects
Solution:
Ans: (c) Explanation: Flowers are crucial for plant reproduction as they facilitate the formation of fruits and seeds, allowing plants to create new generations.
Q2: Which part of the flower produces pollen? (a) Stigma (b) Ovary (c) Anther (d) Sepal
Solution:
Ans: (c) Explanation: The anther is part of the stamen and produces pollen, which is a powder containing the male reproductive cells needed for reproduction.
Q3: How do coconuts spread their seeds? (a) By exploding and shooting seeds out (b) By floating on water (c) By wind dispersal with parachute-like structures (d) By rolling along the ground
Solution:
Ans: (b) Explanation: Coconuts can float across bodies of water because they have a spongy covering that helps them stay afloat and travel to new places.
Q4: What happens to a flower after fertilisation takes place? (a) The ovary transforms into a fruit (b) The flower grows larger petals (c) The flower produces more nectar (d) The flower opens wider
Solution:
Ans: (a) Explanation: After fertilisation, the petals and stamens wither, and the ovary transforms into a fruit within which seeds begin to develop and grow.
Q5: Which of these is an example of a non-flowering plant? (a) Rose bush (b) Sunflower (c) Moss (d) Apple tree
Solution:
Ans: (c) Explanation: Moss is a non-flowering plant that does not produce flowers. It reproduces using spores instead of flowers, fruits, and seeds.
Fill in the Blanks
Q1: The process where a seed begins to grow is called _____.
Solution:
Ans: germination
Q2: The _____ is the sticky surface on the carpel that catches pollen.
Solution:
Ans: stigma
Q3: Seeds need water, air, warmth, and _____ to germinate successfully.
Solution:
Ans: light
Q4: Non-flowering plants like ferns reproduce using _____.
Solution:
Ans: spores
Q5: Dandelion seeds have a parachute-like structure that helps them to be dispersed by _____.
Solution:
Ans: wind
True or False
Q1: All flowers have both male and female parts.
Solution:
Ans: False Explanation: Most flowering plants have both male and female parts, but some flowers have only male or only female parts in them.
Q2: Sepals are small green leaves that protect the flower bud before it opens.
Solution:
Ans: True Explanation: Sepals are protective parts of the flower that cover and safeguard the flower bud before it opens and reveals the petals.
Q3: Wind-pollinated flowers have brightly coloured petals and produce nectar.
Solution:
Ans: False Explanation: Wind-pollinated flowers have small petals that are not brightly coloured, and they do not produce scent or nectar to attract insects.
Q4: Seeds can survive for many years without germinating while waiting for suitable conditions.
Solution:
Ans: True Explanation: Seeds can remain dormant for many years until the right conditions of water, air, warmth, and light are available for germination.
Q5: Seed dispersal helps seeds to avoid competing with each other for space, light, and water.
Solution:
Ans: True Explanation: Seed dispersal spreads seeds away from the parent plant so seedlings have adequate space, light, and water without competing for resources.
Match the Following
Column A
Column B
1. Stamen
A. Seeds with parachute-like structures
2. Ovary
B. The male part of the flower
3. Dandelion
C. Part containing tiny eggs called ovules
4. Nectar
D. Seeds that pass through digestive systems
5. Small seeds in juicy fruits
E. Sweet liquid that attracts insects
Solution:
Ans:
1 - B: The stamen is the male reproductive part of the flower, which includes the anther that produces pollen and the filament.
2 - C: The ovary is part of the carpel and contains tiny eggs called ovules that develop into seeds after fertilisation occurs.
3 - A: Dandelion seeds have a parachute-like structure that helps them float and be dispersed easily by the wind to new locations.
4 - E: Nectar is a sweet liquid produced by flowers to attract insects like bees and butterflies for the purpose of pollination.
5 - D: Small seeds in juicy fruits can pass through an animal's digestive system and be spread far from the parent plant.
Short Answer Questions
Q1: Describe the key stages in the life cycle of a flowering plant.
Solution:
Ans: The life cycle begins with seed germination, where the seed grows into a new plant. Next is plant growth, where roots, stems, and leaves develop. Then flowering occurs when the plant produces flowers. After pollination and fertilisation, fruit production happens as the flower transforms into a fruit. Finally, seed release occurs when the fruit releases seeds that can grow into new plants.
Q2: What are the main parts of a flower and their roles in reproduction?
Solution:
Ans: Flowers have four main parts. Petals are brightly coloured to attract insects for pollination. Sepals protect the flower bud before it opens. The stamen is the male part, with an anther producing pollen and a filament supporting it. The carpel is the female part, with a stigma catching pollen and an ovary containing ovules that become seeds.
Q3: How does insect pollination occur in flowering plants?
Solution:
Ans: Insect pollination occurs when pollinators like bees and butterflies transfer pollen between flowers. Insects are attracted by nectar, a sweet liquid produced by flowers. While feeding on nectar, insects brush against anthers, and pollen sticks to their bodies. The insects then carry the pollen to the stigma of the same or another flower of the same type.
Q4: Why is seed dispersal necessary for plants?
Solution:
Ans: Seed dispersal spreads seeds away from the parent plant, which is necessary when fruits ripen and seeds are ready to grow. Seeds grow into seedlings that need adequate space, light, and water for healthy development. If seeds stay close together, they compete for limited resources, hindering their growth. Plants have evolved various adaptations to effectively disperse seeds.
Q5: What conditions do seeds need for germination and why?
Solution:
Ans: Seeds need four main conditions for germination. Water is needed to activate enzymes and start the germination process. Air provides oxygen for respiration, which converts stored food into energy. Warmth speeds up metabolic processes within the seed at specific temperature ranges. Light triggers germination in some species, though others germinate in darkness. These conditions ensure successful seed growth.
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