NCERT Solutions for Class 9 Science Chapter 7
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms Page 81, Page 82, Page 83, Page 85, Page 88, Page 94 and Exercises in English Medium updated for new academic session 2020-21 download in PDF form free.Hindi Medium version of Class 9 Science chapter 7 answers of पेज 91 के उत्तर or पेज 92 के उत्तर or पेज 93 के उत्तर or पेज 96 के उत्तर or पेज 99 के उत्तर or पेज 105 के उत्तर and अभ्यास के प्रश्न उत्तर are also given to study online or download in PDF format. Download NCERT Solutions Apps 2020-2021 for class 9 all subjects free.
NCERT Solutions for Class 9 Science Chapter 7
|Subject:||Science – विज्ञान|
|Chapter 7:||Diversity in Living Organisms|
9th Science Chapter 7 Answers in English & Hindi Medium
NCERT Solutions for Class 9 Science Chapter 7 Diversity in Living Organisms all Intext questions and chapter ending exercise question answers are given below updated for new academic session 2020-21. Solutions are available in Hindi Medium as well as English Medium format. NCERT Solutions and Offline apps are based on latest NCERT Books 2020-21.
9th Science Chapter 7 Answers in English Medium
9th Science Chapter 7 Answers in Hindi Medium
9th Science Chapter 7 Answers in PDF Form
How do gymnosperm and angiosperms differ from each other?
Gymnosperm have naked seeds whereas Angiosperms have seed inside their fruits.
What are phanerogams? Name its two groups along with criteria of division.
(i) Phanerogams are higher plants that bear flower and seeds.
(ii) Seeds are the result of reproductive process.
(iii) They contain an embryo which store food.
(iv) They are further divided into Gymnosperms and Angiosperms.
(v) Angiosperm have seeds inside the fruits.
What is the primary characteristics on which the first division of organism is made?
Whether the organism is prokaryotic or eukaryotic is the primary characteristic.
Why is there a need to classify living organisms?
(i) It enables us to study living things more easily and understand them better.
(ii) It helps to identify and communicate about the large number of living organisms on earth.
(iii) It helps to trace the possible origins of different living organisms to determine any relationship.
State the characteristic feature of thallophytes? Name two thallophytes which are predominantly aquatic?
Thallophytes body is not well differentiated, no vascular tissue present, usually contain green pigment and have cell wall made up of cellulose. Spirogyra, Ulva are thallophytes and are aquatic.
List any three differences between Aves and Mammalia group.
(a)They lay eggs.
(b) Do not have mammary glands.
(c) Their body is covered with feathers.
(a) They give birth to young ones.
(b) They have mammary glands.
(c) Their body is covered with hairs.
Who proposed the system of binomial nomenclature for the organisms?
Carolus Linnaeus proposed the system of binomial nomenclature.
Write three characteristics each of the following groups of animals: (a) Platyhelmintes (b) Nematoda.
(i) Their body is bilaterally symmetrical.
(ii) They are triploblastic
(iii) There is no coelom.
(i) Their body is cylindrical and bilaterally symmetrical.
(ii) Pseudocoelom is present.
(iii) They are triploblastic.
Questions for Practice on 9th Science Chapter 7
Differentiate between Monera and Fungi on the following grounds:
(a) Body organisation
(c) Cell wall
(d) Mode of nutrition
Name an organisms belongings to each of these kingdom.
(a) Unicellular undefined nucleus.
(c) Some have cell wall made up of cellulose.
(d) Autotrophic nutrition
Example: Blue green algae, bacteria.
(a) Multicellular at later stage organised body.
(c) All have cell wall made up of chitin.
(d) Heterotrophic nutrition.
Example: Yeast, Mashroom
Define the given terms and give one example of each:
(a) Bilateral symmetry
(a) Bilateral symmetry: The organisms which can be divided into two identical equal halves, i.e., like mirror images are said to possess bilateral symmetry.
(b) Coelom: It is the body cavity of the organisms. It is necessary for proper functioning of the body, e.g. heart has coelom which helps it to contract and expand.
(c) Triploblastic: These are the organisms derived from three embryonic germ layers.
Important Questions on 9th Science Chapter 7
आकार: कुछ जीव जैसे बैक्टीरिया अतिसूक्ष्म होते है तो दूसरी ओर ह्वेल जैसे जीव कई मीटर तक लम्बे होते हैं।
जीवन काल: कुछ जीवों जैसे मच्छर का जीवन काल अति न्यून होता है जबकि कुछ पौधे सैकड़ों साल जिन्दा रहते है।
रंग: कुछ जीव रंगहीन (पारदर्शी तक) होते है तो कुछ विभिन्न आकर्षक रंगों युक्त होते हैं।
Number of cells: Unicellular eukaryotes are kept in the kingdom Protista, while multicellular eukaryotes are kept in other kingdoms.
Mode of nutrition and presence of cell wall: Hetereotrophic organisms in which cell wall is present are taken under the kingdom fungi.
Autotrophic organisms in which cell wall is present are taken in the kingdom Plantae. Organisms in which cell wall is absent are taken in the kingdom Animalia.
Thallophyta: Simple body design; with no differentiation into root, stem and leaves.
Bryophyta: Body is differentiated into stem and leaf-like structures. Vascular system is absent.
Pteridophyta: Body is differentiated into root, stem and leaves. Vascular system is present.
Reproductive organs are inconspicuous. Seeds are not produced.
Gymnosperms: Seeds are naked.
Angiosperms: Seeds are covered.
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