Samacheer Kalvi 6th Science Term 1 Unit 4 Book Back Questions and Answers:
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Samacheer Kalvi 6th Science Book Back Chapter 4 Term 1 Solution Guide PDF:
TN State Board Class 6th Science Subject Term 1 Unit 4 one mark and two mark solutions guide PDF available below.
6th Science – Term 1
Unit 4: The Living World of Plants
I. Choose the appropriate answer:
1. Pond is an example of a ______ ecosystem.
Answer: (b) Freshwater
2. The important function of stomata is ……….
Answer: (c) Photosynthesis
3. Organ of absorption is ______
Answer: (a) Root
4. The habitat of water hyacinth is
Answer: (a) Aquatic
II. True or False:
1. Plants can live without water.
False. Plants cannot live without water.
2. All plants have chlorophyll.
3. Plants have three parts: the root, the stem and leaves.
False. Plants have several parts: Such as the root, the stem, leaves, flowers, fruits and seeds.
4. Mountain is an example of a freshwater habitat.
False. Rivers, ponds, lakes and pools are the example for freshwater habitat. (OR) Mountain is an example for Terrestrial habitat.
5. Root is modified into spines.
False. Leaves are modified into spines.
6. Green plants need sunlight.
III. Fill in the Blanks:
- Earth’s surface is covered by __________ % of water.
- The driest places on Earth are __________
- Fixation and absorption are the main functions of __________
- Primary organs of photosynthesis are __________
- Tap root system is present in __________ plants.
- More than 70%
IV. Match the following.
1. Mountain – Monocot
2. Desert – Branches
3. Stem – Dry place
4. Photosynthesis – Himalayas
5. Fibrous Root – Leaves
1. Mountain – Himalayas
2. Desert – Dry place
3. Stem – Branches
4. Photosynthesis – Leaves
5. Fibrous Root – Monocot
V. Arrange in the correct sequence:
1. Leaves – Stem Root – Flower.
Root, Stem, Leaves, Flower.
VI. Very short answer:
1. Classify the plants on the basis of their habitats.
The two major habitats.
(a) Aquatic habitat
(b) Terrestrial habitat
(a) Aquatic habitat classified into two. They are
- Fresh water habitat
- Marine water habitat
(b) Terrestrial habitat classified into three.
- Forest habitat
- Grassland habitat
- Desert habitat.
2. Identify the Desert plants from the following-
Cactus, Hydrilla, Mango and Rose
Cactus plants – grow in deserts, and are able to store water in their stem.
3. Define the term habitat.
A dwelling place of an animal, plant, or another organism, to live and reproduce is called a habitat.
4. Relate the terms leaves and photosynthesis.
The green leaves are essential for preparing food. Because it contains a green pigment called chlorophyll. The preparation of food is known as photosynthesis. Photosynthesis is essential for plant growth.
VII. Short Answer.
1. Why do you call the jasmine plant, a twiner?
The Jasmine plant has a weak stem. It cannot stand straight on its own. It must climb on any support to survive. So the jasmine plant is called a twiner.
2. Compare the taproot and fibrous root systems.
Single root-grow straight with smaller roots arise from the taproot.
eg. Dicot plants- Bean, mango
Cluster of roots arising from base of the stem, tin and uniform in size.
eg. Monocots, grass, paddy
3. Distinguish between terrestrial and aquatic habitats.
- They are found on land
- They include desert, grassland, forest, farms, towns and cities
- They are classified into 3 types, such as Desert habitat, Grassland habitat & Forest habitat.
- Eg. Rubber tree, teak tree, neem tree
- They are found in water.
- They include the areas, permanently as well as occasionally covered by water.
- They are classified into 2 types, such as Fresh water habitat, & Marine water habitat.
- Eg. Lily, lotus, marine algae, sea grasses.
4. List out the plants present in your school garden.
Shoe Flower, Ferns, Crotons, Roses, Lilies, Cactus, Coconut Trees, Royal Palm, Clitoria, Cycas, Agave, Allamanda, Tomato, Brinjal, Lady’s Finger, etc in Terrace garden.
Other Important links for Class 6th Book Back Answers:
Tamil Nadu Class 6th Standard Book Back Guide PDF, Click the link – 6th Book Back Questions & Answers PDF
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