NEET Bioology Previous Papers Chapterwise

81. Which one is wrongly matched?
(1) Uniflagellate gametes – Polysiphonia
(2) Biflagellate zoospores – Brown algae
(3) Unicellular organism – Chlorella
(4) Gemma cups – Marchantia
Ans: (1) Polysiphonia is a genus of red algae, where asexual spores and gametes are non-motile or non-flagellated.
82. After karyogamy followed by meiosis, spores are produced exogenously in
(1) Neurospora
(2) Alternaria
(3) Saccharomyces
(4) Agaricus
Ans:(4) In Agaricus (a genus of basidiomycetes), basidiospores or meiospores are produced exogenously. Neurospora (a genus of ascomycetes) produces ascospores as meiospores but endogenously inside the ascus). Alternaria (a genus of deuteromycetes) does not produce sexual spores. Saccharomyces (Unicellular ascomycetes) produces ascospores, endogenously.
83. Winged pollen grains are present in
(1) Mustard
(2) Cycas
(3) Pinus
(4) Mango
Ans: (3) Winged pollen grains are present in Pinus. Each pollen grain has two wing-like structures which enables it to float in air, as an adaptation for dispersal by the wind.
84. Pneumatophores occur in
(1) Halophytes
(2) Free-floating hydrophytes
(3) Submerged hydrophytes
(4) Carnivorous plants
Ans: (1) Some lateral roots of mangroves become specialized as pneumatophores in saline mud flats. These are lateral roots that grow upward (negative geotropism) for varying distances and function as the site of oxygen intake for the submerged primary root system.
85. Plants having little or no secondary growth are
(1) Grasses
(2) Deciduous angiosperms
(3) Cycads
(4) Conifers
Ans: (1) Grasses are monocots and monocots usually do not have secondary growth. Palm like monocots have anomalous secondary growth.
86. Casparian strips occur in
(1) Epidermis
(2) Pericycle
(3) Endodermis
(4) Cortex
Ans: (3) Casparian strip is a band of cell wall material deposited in the radial and transverse walls of the endodermis. Casparian strip is made of suberin and sometimes lignin.
87. Secondary xylem and phloem in dicot stem are produced by
(1) Apical meristems
(2) Vascular cambium
(3) Axillary meristems
(4) Phellogen
Ans:(2) Secondary tissues are generated from the growth of a cambium. Vascular cambium gives rise to secondary xylem to the inside, and to secondary phloem to the outside.
88. Select the wrong statement :
(1) Cell wall is present in members of Fungi and Plantae
(2) Mushrooms belong to Basidiomycetes
(3) Mitochondria are the powerhouse of the cell in all kingdoms except Monera
(4) Pseudopodia are locomotory and feeding structures in Sporozoans
Ans:(4) Pseudopodia are locomotory structures in sarcodines (Amoeboid).
89. Which of the following statements is correct?
(1) Ovules are not enclosed by ovary wall in gymnosperms
(2) Selaginella is heterosporous, while Salvinia is homosporous
(3) Stems are usually unbranched in both Cycas and Cedrus
(4) Horsetails are gymnosperms
Ans: (1) The gymnosperms are a group of seedproducing plants. The name is based on the unenclosed condition of their seeds (called ovules in their unfertilized state).
90. Sweet potato is a modified
(1) Stem
(2) Adventitious root
(3) Rhizome
(4) Tap root
Ans:(2) Sweet potato is a modified adventitious root for storage of food. Rhizomes are underground modified stem. Tap root is primary root directly elongated from the radicle.