Cardiff International School Dhaka (CISD)
Lost Class Make Up Assignment
Class: 3, Section: A, B
Subject: Science
th
(
Date: 8 Sunday)-14th (Saturday) February 2015
Total Mark- 10
Instructions: All of your assignment must be done in A4 size paper. Mention your Name, Class,
Roll and Section clearly on the top sheet of your assignment.
Submission Deadline: Saturday 14th February 10.00 AM to the respective subject teacher. The
deadline is strict.
Name: .........................................................................................................................................
Class: ....................Roll#........................Sec: ..................Teacher: .........................................
Sunday-Saturday
08th -14th February 2015
Date: 08th February, 2015, Sunday
Lesson: Adaptations in Plants, Page: 60 -61
Task: Read the pages and following text carefully and complete the following Worksheets.
Worksheet/Exercise:
Aquatic Plants:
1) Floating Plants: These are light, spongy and float on the surface of the water. Example:
Duckweed Water hyacinth.
2) Fixed Plants: Have roots which are fixed to the bottom of the pond. Have long, hollow stem
to reach the surface of the water. Have broad and waxy coated leaves to prevent them from
rotting. Example: Lotus, Water Lily
3) Underwater Plants: These have narrow leaves without any stomata. They breathe through
the surface and keep the water clean. Example: tape grass, pond weed
www.reflectivelearn.com
Insectivorous Plants:
Plants are carnivorous in nature. Their leaves are modified to trap insects. Example: (Venus
flytrap) Venus fly trap has leaves that are like boxes with hinges. They have long hair along the
edges. When an insect touches the hair, the leaf snaps shut, trapping the creature inside
(Pitcher plant) Pitcher plant, leaves are in the form of a container or pitcher with a lid to cover
the mouth
Non Green Plants:
They do not have chlorophyll. Example: Indian pipe, coral root. Non-green (Saprophytic) plants:
Plants that cannot make their own food and absorb food from dead plants and animals.
Example: Mushroom, Toadstool, Coral root.
Useful Plants:
Plant Use Tea, Coffee plant Tea and coffee are obtained. Bamboo Plant Paper, baskets, huts,
mats, furniture, walking sticks, etc. Coconut Plant Coconut oil, coconut water, fruit to eat
Rubber Tree Juice of the tree is used to make rubber for tyre. Eucalyptus, Tulsi, Cinchona, Neem
Used as medicines Henna Decorating hands, dye. Teak, Sal, Sheesham Furniture Acacia Juice
used to make gum Cotton, Jute Make clothes, carpet, sack, rope. We depend on Plants for food.
Q.1. Fill in the blanks:
(5)
a) Aquatic plants ……………………….. or are submerged in water.
b) Non-green plants like ………………………….. and ………………………… absorb food from dead
remains of living things.
c) Underwater plants have narrow thin leaves with no ………………………
d) Insectivorous Plants catch insects in special traps made from their modified ………………………
Q. 2. Name three types of aquatic plants?
(1.5)
Q.3.What helps the floating plants to float on water?
(3.5)
Answer Key
1. Answer:
a) Float
b) Mushroom, Toadstool
c) Stomata
d) Leaves
2. Answer: Three types of aquatic plants are
i) Floating Plants
ii) Fixed Plants
iii) Underwater Plants
3. Answer: Some floating plants are spongy and filled with air. This makes
the plants very light and helps them to float on water.
Date: 10th February, 2015, Tuesday
Topic: Adaptations in Plants
Page: 57 – 65
Task: Read the pages and following text carefully and complete the following
Worksheets.
Plants have adaptations to help them live and grow in different areas. These adaptations might make
it very difficult for the plant to survive in a different place. This explains why certain plants are found
in one area, but not in another.
In deserts, precipitation is low and the temperature is often hot, so evaporation is also high. Water
can be scarce in the desert. Desert plants have several types of adaptations that help them conserve
water.
1. A leathery or waxy coating on the leaves and stems reduces evaporation.
2. Thick stems or other plant parts provide water storage space.
3. Small leaves or spines (modified leaves) reduce the surface area of the plant exposed to the sun.
(Some plants such as the ocotillo and Palo Verde shed their leaves during dry spells, further reducing
their surface area.)
4. Spines and fine hairs reflect heat and reduce the air flow over the plant’s surface.
Many plants have a combination of these adaptations. For example, the hedgehog cactus has
enlarged stems, a thick waxy coating and a dense cover of spines.

Draw a cactus plant and answer the following questions:
(4)
Q.1. Why does the roots of a cactus plant spread out just below the surface of the ground?
(2)
Q. 2. Why do they grow spines instead of leaves?
(2)
Q. 3. Why are the stems flashy?
(2)
Answer Key:
Cactus Plants
1. Answer: Plants have adaptations to help them live and grow in different areas. These
adaptations might make it very difficult for the plant to survive in a different place. The roots
of a cactus plant spread out wide or go deep into the ground to absorb a lot of water when it
does rain.
2. Answer: Cactus plants have no leaves or small seasonal leaves that only grow after it rains.
The leaves are modified into spines. The lack of leaves helps reduce water loss during
photosynthesis. They conduct photosynthesis in their green stems. Spines to discourage
animals from eating plants for water. Waxy coating on stems and leaves help reduce water
loss.
3. Cactuses have stems but no leaves. Cactus plants conduct photosynthesis in their green stems.
They store water in the stems, which become fleshy. Waxy coating on the leaves or stems
reduces loss of water.
Date: 11th February, 2015, Wednesday
Topic: Adaptations in Plants
Page: 57 – 65
Task: Project work:
Q.1. Choose one habitat that is found in Bangladesh: rainforest (such as in Sunderban). Write about
the plants that you would find in that habitat. Describe some of the adaptations that make those
particular plants able to survive that environmental condition. Draw or paste picture of described
plants and label them.
(10)
Answer Key:
The Sundarbans
The Sundarbans are the largest continuous mangrove forests in the world, covering about 6,000 sq.
km of both land and water. Part of the world's largest delta formed by the great Ganges and
Brahmaputra rivers, which converge on the Bengal basin. The western portion lies in India and the
rest (about 60%) in Bangladesh. About one third of the total area of this forest is covered by river
channels, canals and tidal creeks, varying in width from a few meters to five kilometers. The
Bangladesh portion of the forest is dominated by high mangroves, the climate is tropical maritime,
with lots of rain during the monsoon. During the winter it is mild and dry.
1. Bark, 2.Lianas, 3. Drip Tips, 4.Buttresses, 5. Prop and Stilt Roots, 6.Epiphytes, 7.Bromeliads
1. Bark
In drier, temperate deciduous forests a thick bark helps to limit moisture evaporation from
the tree's trunk. Since this is not a concern in the high humidity of tropical rainforests, most
trees have a thin, smooth bark. The smoothness of the bark may also make it difficult for
other plants to grow on their surface.
2. Lianas
Lianas are climbing woody vines that drape rainforest trees. They have adapted to life in the
rainforest by having their roots in the ground and climbing high into the tree canopy to reach
available sunlight. Many lianas start life in the rainforest canopy and send roots down to the
ground.
3. Drip Tips
The leaves of forest trees have adapted to cope with
exceptionally high rainfall. Many tropical rainforest leaves have
a drip tip. It is thought that these drip tips enable rain drops to
run off quickly. Plants need to shed water to avoid growth of
fungus and bacteria in the warm, wet tropical rainforest.
4. Buttresses
Many large trees have massive ridges near the base that can rise
30 feet high before blending into the trunk. Why do they form?
Buttress roots provide extra stability, especially since roots of
tropical rainforest trees are not typically as deep as those of
trees in temperate zones.
5. Prop and Stilt Roots
Prop and stilt roots help give support and are characteristic of tropical palms growing in
shallow, wet soils. Although the tree grows fairly slowly, these above-ground roots can grow
28 inches a month.
6. Epiphytes
Epiphytes are plants that live on the surface of other plants,
especially the trunk and branches. They grow on trees to take
advantage of the sunlight in the canopy. Most are orchids,
bromeliads, ferns, and Philodendron relatives. Tiny plants called
epiphylls, mostly mosses, liverworts and lichens, live on the
surface of leaves.
Mangroves
On tropical deltas and along ocean edges and river estuaries, trees have
adapted to living in wet, marshy conditions. These trees, called
mangroves, have wide-spreading stilt roots that support the trees in the
tidal mud and trap nutritious organic matter.
Text Book/Reference Book: I Explore a Science Textbook 4
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