Maharashtra Board Class 9 Science Solution Chapter 6 – Classification of Plants
Balbharati Maharashtra Board Class 9 Science Solution Chapter 6: Classification of Plants. Marathi or English Medium Students of Class 9 get here Classification of Plants full Exercise Solution.
|
Std |
Maharashtra Class 9 |
| Subject |
Science Solution |
|
Chapter |
Classification of Plants |
1.) Match the proper terms from column A and C with the description in column B.
Ans:
a) Thallophyta: These plants mainly grow in water
For example: Algae
b) Bryophyta: These plants needs water for reproduction
For example: Moss
c) Pteridophytes: Tissues are present for conduction of water and food
For example: Fern
d) Gymnosperms: No natural covering on seeds
For example: Cycas
e) Angiosperms: Seeds are formed in fruits
For example: Tamarind
2.) Complete the sentences by filling in the blanks and explain those statements.
Ans:
a) Thallophyta plants have soft and fibre like body.
b) Bryophytes are called the amphibian of the plant kingdom.
c) In Pteridophytes asexual reproduction occurs by spore formation and sexual reproduction occurs by zygote
d) Male and female flowers of gymnosperms are borne on different sporophylls of the same plant.
3.) Answer the following questions in your own words.
a) Write the characteristics of subkingdom phanerogams.
Ans:
Following are the characteristics of subkingdom phanerogams:
- Phanerogams are the plants which are having special structure for reproduction and they produces seeds.
- These plants produces seeds after reproduction and that seeds contains embryo in which food is stored.
- While the process of germination of seed the food stored will be used for the initial growth of the embryo.
- Phanerogams are classified as Gymnosperms and angiosperms on the basis of seeds enclosed in a fruit or not.
b) Distinguish between monocots and dicots.
Ans:
Monocots:
- It’s embryo has only one cotyledon in seed.
- The petals of monocot are in the form of multiples of three.
- Stem vascular bundles are scattered.
- In monocots, leaves are having parallel venation.
- Monocots has fibrous or adventitious roots.
Dicots:
- It’s embryo has two cotyledons in seed.
- In monocots, the petals are in the form of multiples of four or five.
- Stem vascular bundles are in the form of rings.
- In monocots, the leaves have reticulate venation.
- Dicots has tap root system in them.
c) Write a paragraph in your own words about the ornamental plants called fern.
Ans;
- The ornamental plants called fern belongs to the division Pteridophytes.
- In this plants, the plant body is differentiated into stem, leaves and roots.
- As these plants are having special tissues for the conduction of water and food and hence they mostly found in cool, damp and shady places.
- Plants like ferns are mainly used for ornamental purpose.
- They reproduce with the help of spores formed on the back surface of their leaves.
- The examples are fern like Nephrolepis, Marsilea, Pteris, Adiantum, Equisetum etc.
- These plants reproduce asexually by spore formation and sexually by zygote formation.
d) Sketch, label and describe the Spirogyra.
Ans:
- Spirogyra is the green algae belonging to division Thallophyta.
- These type of plants mostly grow in water and they don’t have specific parts such as root, stem, leaves, flowers but they are autotrophic due to the presence of chlorophyll pigment.
- They may be unicellular or multicellular.
- The neat labelled diagram of Spirogyra is as shown in the following figure.
e) Write the characteristics of plants belonging to division Bryophyta.
Ans:
- As the plants belonging to division Bryophyta grow in moist soil but needs water for reproduction hence they are called as amphibian of the plant kingdom.
- The plants belonging to division Bryophyta are thalloid, multicellular and autotrophic in nature.
- The plants belonging to Bryophyta reproduce by the spore formation process.
- These plants are having body flat, ribbon like long and without true roots, stem and leaves.
For example:
Moss, marchantia, antheseros, riccia etc.
4.) Sketch and label the figures of the following pants and explain them into brief.
Marchantia, Funaria, fern, Spirogyra
a) Marchantia:
- It belongs to the division Bryophyta and subkingdom cryptograms. These plants grows in damp ground and on the wall in the rainy season and forms like the green carpet.
- They have thallous which has number of rhizoids at its lower surface. At its upper surface there is stalk which has capsule like structure which contains spores inside it.
- At maturity, for asexual reproduction the capsule which has spores contained in it releases spore.
b) Funaria (Moss):
- Funaria plants belonging to division Bryophyta grow in moist soil but needs water for reproduction hence they are called as amphibian of the plant kingdom.
- The plants belonging to division Bryophyta are thalloid, multicellular and autotrophic in nature.
- The plants belonging to Bryophyta reproduce by the spore formation process.
- These plants are having body flat, ribbon like long and without true roots, stem and leaves.
For example:
Moss, marchantia, antheseros, riccia etc.
c) Fern:
- The ornamental plants called fern belongs to the division Pteridophytes.
- In this plants, the plant body is differentiated into stem, leaves and roots.
- As these plants are having special tissues for the conduction of water and food and hence they mostly found in cool, damp and shady places.
- Plants like ferns are mainly used for ornamental purpose.
- They reproduce with the help of spores formed on the back surface of their leaves.
- The examples are fern like Nephrolepis, Marsilea, Pteris, Adiantum, Equisetum etc.
- These plants reproduce asexually by spore formation and sexually by zygote formation.
d) Spirogyra:
- Spirogyra is the green algae belonging to division Thallophyta.
- These type of plants mostly grow in water and they don’t have specific parts such as root, stem, leaves, flowers but they are autotrophic due to the presence of chlorophyll pigment.
- They may be unicellular or multicellular.
- The neat labelled diagram of Spirogyra is as shown in the following figure.
5.) Collect a monocot and dicot plant available in your area. Observe the plants carefully and describe them in scientific language.
Ans:
Monocots:
- It’s embryo has only one cotyledon in seed.
- The petals of monocot are in the form of multiples of three.
- Stem vascular bundles are scattered.
- In monocots, leaves are having parallel venation.
- Monocots has fibrous or adventitious roots.
For example:
Bamboo, banana, onion etc.
Dicots:
- It’s embryo has two cotyledons in seed.
- In monocots, the petals are in the form of multiples of four or five.
- Stem vascular bundles are in the form of rings.
- In monocots, the leaves have reticulate venation.
- Dicots has tap root system in them.
For example:
Banyan tree
6.) Which criteria is used for the classification of plants? Explain with reasons.
Ans:
Plants are classified on the basis of vascular tissues, production of seeds, covering of seeds, differentiation of plant body into root, stem and leaves and number of cotyledons in the seed.
The following flow chart briefly explain the classification of plants.
