Lesson.4 The World of Plant
Lesson.4 The World of Plant
I. Choose the correct answer:
1. Pond is an example of ___________ecosystem.
- Marine
- Fresh water
- Deserts
- Mountain
Ans : Fresh water
2. The important function of stomata is ___________
- Conduction
- Transpiration
- Photosynthesis
- Absorption
Ans : Transpiration
3. Organs of absorption is ___________
- Root
- Stem
- Leaf
- Flower
Ans : Root
4. The habitat of water hyacinth is
- Aquatic
- Terrestrial
- Desert
- Mountain
Ans : Aquatic
II . Find whether the following statements are true or false. – if false give the correct answer
1. Plants can live without water.
Ans : False
Cu. An : Plants cannot live without water.
2. All plants have chlorophyll.
Ans : False.
Cu. An : All plants Leaves have chlorophyll.
3. Plants have three parts: the root, the stem and leaves.
Ans : False.
Cu. An : Plants have four parts : the root, the stem, leaves and flowers.
4. Mountain is an example for freshwater habitat.
Ans : False
Cu. An : Mountain is an example for Terrestrial habitat.
5. Root is modified into spines.
Ans : False
Cu. An : Leaf is modified into spines.
6. Green plants need sunlight.
Ans : True
III. Fill up the blanks.
1. Earth’s surface is covered by ________ % of water.
Ans : 70
2. The driest places on Earth are ________.
Ans : Deserts
3. Fixation and absorption are the main functions of _______.
Ans : Root
4. Primary organs of photosynthesis are ________.
Ans : Leaves
5. Tap root system present in ________plants.
Ans : Dicot
IV. Arrange in correct sequence
1. Leaf – Stem – Root – Flower
Ans : Flower → Leaf → Stem → Root
2. Transpiration – Conduction – Absorption – Fixation
Ans : Transpiration → Conduction → Absorption → Fixation
V. Match the following
| 1. Mountain | Monocot |
| 2. Desert | Branches |
| 3. Stem | Dry place |
| 4. Photosynthesis | Himalayas |
| 5. . Fibrous toot | Leaves |
| Ans : 1 – D, 2 – C, 3 – B, 4 – E, 5 – A | |
VI. Answer very briefly
1. Classify the plants on the basis of their habitats.
Aquatic habitat
- Fresh water habitat : Water hyacinth
- Marine water habitat : Marine algae
Terrestial habitat
- Forest habitat : Rubber trees
- Grassland habitat : Grasses
- Desert habitat : Cactus
2. Mention few desert plants.
Cactus plants – grow in deserts, and are able to store water in their stem
3. Define the term habitat.
Each and every organism needs a place to live and reproduce. Such a dwelling place is called habitat.
4. Relate the terms leaves and photosynthesis.
The process of preparation of food with the help of chlorophyll in leaves, sunlight, carbondioxide and water is called photosynthesis.
5. Identify the desert plants from the following – Cactus, Hydrilla, Mango and Rose.
Cactus
VII. Give Short answer
1. Why do you call jasmine plants, a twiner?
- Jasmine plant have weak stems.
- They cannot stand straight on their own.
- They must climb on any support to survive.
- So, we call jasmine plant as a twiner.
2. Compare the taproot and fibrous root systems.
| Taproot system | Fibrous root system |
| 1. It consists of a single root called taproot, which grows straight down into the ground. | It consists of roots arising from the base of the from the base of the stem |
| 2. They are seen in Dicotyledonous plants. | They are seen in Monocotyledonous plants |
| Eg : Bean, Mango, Neem | Eg : Grass, Paddy, Maize |
3. Distinguish between terrestrial and aquatic habitats.
| Terrestrial habitat | Aquatic habitat |
| 1. Habitats which include land, is called Terrestrial habitat | Habitats which include area with water is called Aquatic habitat. |
| Eg : Forest – Teak, Neem Grassland – Grasses Desert – Cactus, Aloevera | Eg: Fresh water habitat – Lotus, lily Marine habitat – Marine algae, Phyto-planktons |
4. List out the plants present in your school garden.
- Neem tree
- Banyan tree
VIII. Answer in detail
1. Make a list of the functions of root and stem.
a) Functions of Root :
- Root, fixes the plant to the soil.
- Absorbs water and minerals from the soil.
- Stores food in some plants.
- Eg : Carrot and Beet root.
b) Functions of the stem :
The stem,
- Supports the branches, leaves, flowers and fruits.
- Transports water and minerals from roots to upper aerial plant parts.
- Transports the prepared food from leaves to other parts through stem.
- Stores food. eg : Sugarcane.