December 8, 2024 by Vijay Wardhan 1. There are some dead and corky areas with definite margins on the stem, branches and fruits of lemon. This disease should be : Scab Canker Rust Curl Explanation:Canker is a disease characterized by sunken, dead areas on stems, branches, and fruits. It is commonly caused by bacteria or fungi and can lead to significant damage in affected plants. 2. Vascular cryptogam is the term used for : Pteridophytes Algae Angiosperms Gymnosperms Explanation:Pteridophytes are called vascular cryptogams because they possess vascular tissues but do not produce seeds. This term distinguishes them from non-vascular cryptogams like algae and bryophytes. 3. The pathogen that causes covered smut of Sorghum is : Sphacelotheca Colletotrichum Cercospora Helminthosporium Explanation:Sphacelotheca is the pathogen responsible for covered smut in Sorghum, a disease that affects the grains and can lead to significant crop losses. 4. Chemicals which are applied soon after the outset of infection, suppress the development of pathogen, thus curing the plant, are called : Eradicants Therapeutants Fumicides Protectants Explanation:Therapeutants are chemicals applied after the onset of infection to suppress the development of pathogens and cure the plant. They differ from protectants, which are applied preventively. 5. Which are non-seed-bearing vascular plants? Pteridophytes Bryophyte Angiosperms Gymnosperms Explanation:Pteridophytes are non-seed-bearing vascular plants. They reproduce via spores and have vascular tissues, unlike bryophytes that lack vascular tissues and gymnosperms and angiosperms that produce seeds. 6. Black rust of wheat is caused by: Puccinia Yeast Rhizopus Penicillium Explanation:Black rust of wheat, also known as stem rust, is caused by the fungus Puccinia graminis. It is a serious disease that affects wheat crops worldwide. 7. Late blight of potato is caused by : Fusarium moniliforme Albugo candida Alternaria solani Phytophthora infestans Explanation:Late blight of potato is caused by the oomycete Phytophthora infestans. This pathogen is notorious for causing the Irish potato famine and continues to be a significant threat to potato crops worldwide. 8. Downy mildew disease is caused by : Puccinia Peronospora Phytophthora Albugo Explanation:Downy mildew is caused by various species of the genus Peronospora. This disease affects a wide range of plants, leading to the appearance of downy growth on the underside of leaves and significant crop damage. 9. The disease occurring more or less regularly from year to year in a particular locality is referred to as : Epidemic disease Endemic disease Pandemic disease Sporadic disease Explanation:An endemic disease is one that is consistently present in a particular geographic area or population. It occurs regularly and at predictable rates. 10. A plant which reproduces by spores, has vascular tissue but lacks flowers should belong to : Pteridophyta Bryophyta Gymnosperms Thallophyta Explanation:A plant that reproduces by spores, has vascular tissues, and lacks flowers is a pteridophyte. This group includes ferns and their relatives, distinct from bryophytes, thallophytes, and gymnosperms. Loading …
