Title Advanced series 9th class Biology - Solutions.pdf ✅

Class 9 Biology Table of Content 1. Diversity in Living World - Plants 1 – 6 2. Diversity in Living World - Animals 7 - 13 3. The Fundamental Unit of Life 14 - 28 4. Tissues 29 – 52 5. Why Do We Fall Ill 53 – 57 6. Improvement in Food Resources 58 – 63 7. Natural Resources 64 -74 8. Heredity and Evolution 75 – 82 9. Control and Coordination 83 - 102


Class 9 – Biology | A - 9 Diversity in Living Organisms - Plants 2 10. Correct option: (3) a-iii, b-iv, c-ii, d-i Artificial systems of classification were based upon morphological characters for grouping of organisms. They were mainly based on vegetative characters or on the androecium structure. Natural classification system is based on natural affinities among the organisms. It considers external features along with internal features such as ultrastructure, anatomy, embryology and phytochemistry. Phylogenetic classification is based on evolutionary relationships between organisms. Cytotaxonomy is the system of classification of organisms which is based upon the cytological information of their cells like chromosome number. 11. Correct option: (2) Algae Algae are chlorophyll-bearing, simple, thalloid, autotrophic and largely aquatic (both fresh water and marine) organisms. 12. Correct option: (2) i-c, ii-d, iii-a, iv-b The science of classification is taxonomy, while the study of evolutionary connections between species is phylogeny. Numerical taxonomy is a classification system in biological systematics which deals with the grouping by numerical methods of taxonomic units based on their character states. Cytotaxonomy is the system of classification of organisms which is based upon the cytological information of their cells. These includes Chromosome number, morphology, and Behaviour. 13. Correct option: (4) a-iii, b-iv, c-i, d-ii Spirogyra belongs to Chlorophyceae and has a filamentous structure. Colonial forms exist in case of volvox. Kelps have massive plant body reaching up to the surface of water body. Chlamydomonas are unicellular green algae. 14. Correct option: (4) All of the above Vegetative reproduction usually takes place by fragmentation or by formation of different types of spores. Zoospore formation is rare. Sexual reproduction can be isogamous, anisogamous, or oogamous. Asexual reproduction can occur by flagellated zoospores produced in zoosporangia. 15. Correct option: (2) a-iv, b-ii, c-i, d-iii Zoospores are motile asexual spores having two polar flagella. Fucus produce oogamous spores with single large female spore and small male spores. Chlamydomonas produces isogamous or similar types of motile gametes. Spirogyra produces anisogamous spores. 16. Correct option: (3) Both (1) and (2) Certain marine brown and red algae produce large amounts of hydrocolloids (water holding substances), e.g., algin (brown algae) and carrageen (red algae) which are used commercially. 17. Correct option: (3) Gelidium and Gracilaria Gracilaria has become the preferred seaweed for making food grade agar because it has been successfully cultivated in Chile and Indonesia. Gelidium continues to be the preferred seaweed for making bacteriological and pharmaceutical grade agars and agarose. 18. Correct option: (1) Chlorophyceae The members of Chlorophyceae are commonly called green algae. The plant body may be unicellular, colonial, or filamentous. They are usually grass-green due to the dominance of pigments chlorophyll a and b.