Plant Kingdom quiz

Which class of algae stores food as floridean starch?

Agar is obtained from:

Algin is obtained from:

The dominant phase in bryophytes is the:

Peat is obtained from:

Which of these is heterosporous?

The tallest tree species among gymnosperms is:

Which alga is a protein-rich food used even by space travellers?

Gemmae are asexual buds in:

The smallest flowering plant is:

What is chemotaxonomy? (2 marks)

What are the main features of Chlorophyceae? (2 marks)

Describe the plant body of a brown alga. (2 marks)

What is a protonema? (2 marks)

What is the structure of the sporophyte of a moss? (2 marks)

Why are pteridophytes considered more advanced than bryophytes? (2 marks)

What is a prothallus? (2 marks)

Name the four classes of pteridophytes with an example each. (2 marks)

Why are gymnosperms called naked-seeded plants? (2 marks)

What is the role of mycorrhiza in Pinus? (2 marks)

A Spirogyra filament has 120 cells. If each cell divides once, how many cells will there be? If conjugation occurs between two filaments of 50 cells each, how many zygospores can form at most? (3 marks)

A fern leaf has 30 pinnae, each with 12 sori, each with 50 sporangia, and each sporangium has 64 spores. Calculate the total number of spores produced by the leaf. (3 marks)

In Selaginella, a megasporangium produces 4 megaspores and a microsporangium 256 microspores. Calculate the ratio of microspores to megaspores. (3 marks)

A Sphagnum bog accumulates 1 mm of peat per year. How many years will it take to form a peat layer 2 m thick? (3 marks)

A Cycas plant has a stem 2 m tall with 30 leaves at the crown. If each leaf has 120 leaflets, calculate the total number of leaflets. (3 marks)

Read the passage and answer the questions. A student collected three algae. Alga X was green and filamentous with spiral chloroplasts. Alga Y was brown, large, with a holdfast, stipe and frond. Alga Z was red, found in deep water and stored floridean starch. (i) Name the classes of X, Y and Z. (ii) Why can red algae live at great depths? (iii) Name a commercial product from Y and from Z. (5 marks)

Read the passage and answer the questions. Bryophytes include various mosses and liverworts that are found commonly growing in moist shaded areas in the hills. They lack true roots, stems or leaves. The plant body is more differentiated than that of algae. It is thallus-like and prostrate or erect, and attached to the substratum by unicellular or multicellular rhizoids. (i) Why do bryophytes need water for fertilisation? (ii) Which part of the moss is diploid? (iii) Give two ecological roles of mosses. (5 marks)

Read the passage and answer the questions. The pteridophytes include horsetails and ferns. Pteridophytes are used for medicinal purposes and as soil-binders. They are also frequently grown as ornamentals. Evolutionarily, they are the first terrestrial plants to possess vascular tissues, xylem and phloem. (i) What is the main plant body in pteridophytes? (ii) Where are sporangia borne? (iii) Why are most pteridophytes found in damp, shady places? (5 marks)

Read the passage and answer the questions. The gymnosperms are plants in which the ovules are not enclosed by any ovary wall and remain exposed, both before and after fertilisation. The seeds that develop after fertilisation are not covered. Gymnosperms include medium-sized trees or tall trees and shrubs. The giant redwood tree Sequoia is one of the tallest tree species. (i) What are the male and female cones called? (ii) How does pollination occur in gymnosperms? (iii) Name a gymnosperm with coralloid roots. (5 marks)

Read the passage and answer the questions. Linnaeus's system of classification was based on vegetative characters or the androecium structure. Such systems gave equal weightage to vegetative and sexual characteristics. Since the vegetative characters are more easily affected by environment, they separated closely related species. (i) What type of system was this? (ii) What did natural systems use? (iii) What are phylogenetic systems based on? (5 marks)

Explain the systems of classification of plants. Describe numerical taxonomy, cytotaxonomy and chemotaxonomy. (6 marks)

Describe the main features of the three classes of algae with examples and their economic importance. (6 marks)

Describe the features of bryophytes. Compare liverworts and mosses with labelled diagrams. (6 marks)

Describe the features of pteridophytes with examples. Draw a labelled diagram of a fern and explain heterospory. (6 marks)

Describe the features of gymnosperms and angiosperms with examples. Draw a labelled diagram of Pinus or Cycas. (6 marks)