Biology
Class - XI
Chapter 3 Assignments
CHAPTER 3
Plant Kingdom
1 MARK QUESTIONS
1. What is a pyrenoid body?
2. Why does green algae looks green?
3. How are plants placed in phylogenetic system of classification?
4. Which group of plants is regarded as first terestrial plants? Why?
5. Which substance covers the cell wall of Phaeophyceae?
6. How are pteridophytes similar to bryophytes?
7. Define gemma.
8. Name the male and female sex organs of bryophytes?
9. Where are seeds located in gymnosperm?
10. Which substance has structural similarity to florideanstarch ?
11. What is the venation type in dicots and monocots?
12. What is alternation of generations?
13. Which organism is regarded as one of the tallest tree species ?
14. WhayCycas is called a living fossil?
15. What does syngamy and triple fusion represent?
16. Name the organisms which exhibit heterospory can exhibit seed habit.
17. Where do mosses grow?
18. The gametes and spores of phaeophyceae have a distinct morphology. Give its name.
19. How does pine leaves help in soil erosion?
2/3 MARK QUESTIONS
1. What is Kingdom-Plantae?
2. What is chemotaxonomy? On which factors I it based?
3. Differentiate between cytotaxonomy and chemotaxonomy.
4. Write a brief account of reproduction in algae?
5. Gymnosperms can show polyembroyony. Why do you think so?
6. What is the economic importance of bryophytes?
7. Vascular tissues are not present in bryophytes. Then how the conduction of water and food takes
place?
8. Sphagnum has a lot of economic importance. Justify.
9. How is leafy stage formed in mosses? How is it different from protonema?
10. Write a brief note on numerical taxonomy?
11. How green algae are used as food. Describe briefly.
12. Write a brief account of mosses?
13. Explain the nature of sporophylls and bryophytes?
14. Both gymnosperms and angiosperms bear seeds. But, why are they classified separately?
15. The gametophytes of bryophytes and pteridophytes are different from that of gymnosperms. How?
16. What is artificial system of classification? Write its advantages and disadvantages?
17. Roots in some gymnosperms have fungal or algal association. Give examples, their names and role
in the plants.
18. Demonstrate alternation of generations in plants by a diagram?
19. How triploid PEN is formed? What is indicated by triploid condition of endosperm?
20. Write a note on double fertilization?
21. The leaves in gymnosperms are adapted to withstand xerophytic conditions. Justify.
22. When and where does reduction division take place in the life cycle of a livemost, a moss, a fern, a
gymnosperm, and an angiosperm?
5 MARK QUESTIONS
1. Pteridophytes and Gymnosperms have haplo-diplontic life cycle. Explain.
2. Describe the plant body of a moss with the help of a well labeled diagram?
3. What is heterospory? Briefly comment on its significance. Give two examples.
4. Algae are known to reproduce asexually by a variety of spores under different environmental
condition. Name these spores and the conditions under which they are produced?
5. What role does vascular plant play in keeping the earth green? Which features help them to
dominate the earth?
6. Draw the life cycle of an angiosperm along with a brief note on double fertilization.