Q421
Open questionWhich of the following appendices of the recommendations of ICBN lists the names of genera which are conserved against the principle of priority because of their long use?
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Biology GK · all questionsPlant Kindom
Plant Kindom
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Q422
Open questionConsider the following statements and choose the correct answer:
1. Spores of pine are borne in cones
2. In pine, the sporophyte is the smaller generation and after germination is dependent
3. In pine, there are two kinds of spores - microspores and megaspores
4. The male gametophyte of pine is a dependent structure and is reduced to six cells
1. Spores of pine are borne in cones
2. In pine, the sporophyte is the smaller generation and after germination is dependent
3. In pine, there are two kinds of spores - microspores and megaspores
4. The male gametophyte of pine is a dependent structure and is reduced to six cells
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Q423
Open questionThe central or axial filament forming the core of the fungal flagellum is known as
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Q424
Open questionOne of the . . . . . . . ., the giant redwood tree Sequoia is one of the tallest tree species.
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Q425
Open questionAccording to which principles, construction of taxa in hierarchical system may be based on similarity factor amongst individuals expressed in terms of character analysis?
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Q426
Open questionThe tallest plant in the world is
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Q427
Open questionMatch List-I with List-II and select the correct answer:
| List-I | List-II |
| a. Macrosclereids | 1. Small and more or less isodiametric in shape |
| b. Astrosclereids | 2. Rod shaped elongated sclereids |
| c. Osteosclereids | 3. Bone or barrel-shaped sclereids |
| d. Brachy-sclereids | 4. Star-shaped sclereids with extreme lobes or arms |
| e. Trichosclereids | 5. Hair-like sclereid |
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Q428
Open questionWater conduction takes place in mosses through
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Q429
Open questionIn bacteria the components of the electron transport system are located in the
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Q430
Open questionAn antibiotic commonly acts by
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Q431
Open questionThe term leptorn, for the conductive elements of phloem, was used by
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Q432
Open questionStem cutting is done generally to grow
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Q433
Open questionIn case of Physarales, the cleavage furrows in the protoplasm of young sporangium are filled with fungus cellulose material in the form of an intricate network of fine, hyaline threads called the
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Q434
Open questionIn which of the following kind of xylem vessels, the secondary wall thickenings are transverse interconnected bars?
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Q435
Open questionStructural advantages of tracheae and tracheids include
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Q436
Open questionSilkworm grows on
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Q437
Open questionMatch List-I with List-II and select the correct answer:
| List-I | List-II |
| a. Promeristem | 1. Based on position |
| b. Apical meristem | 2. Based on function |
| c. File meristem | 3. Based on plane of divisions |
| d. Ground meristem | 4. Based on origin |
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Q438
Open questionConsider the following statements and choose the correct answer:
1. Sieve cells are present in all groups of plants
2. Transverse position of end walls of sieve tubes is a primitive feature whereas their oblique or inclined position is an advanced condition
3. Restriction of sieve areas on the end wall is a primitive condition whereas their presence on end wall as well as radial wall is an advanced condition
4. The sieve plates with larger sieve pores are advanced
1. Sieve cells are present in all groups of plants
2. Transverse position of end walls of sieve tubes is a primitive feature whereas their oblique or inclined position is an advanced condition
3. Restriction of sieve areas on the end wall is a primitive condition whereas their presence on end wall as well as radial wall is an advanced condition
4. The sieve plates with larger sieve pores are advanced
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Q439
Open questionGroups of secondary phloem present scattered among the secondary xylem are known as
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Q440
Open questionThe secondary permanent tissues, such as secondary xylem, secondary phloem and cork, are always derived from
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