IAS (Admin.) Mains Botany: Questions 265 - 273 of 1252
Choose Programs:
📹 Video Course 2024 (101 Lectures [53 hrs : 32 mins]): Offline Support
Rs. 280.00 -OR-
1 Month Validity (Multiple Devices)
Preview All LecturesDetails
🎓 Study Material (438 Notes): 2024-2025 Syllabus
Rs. 550.00 -OR-
3 Year Validity (Multiple Devices)
Topic-wise Notes & SampleDetails
🎯 1252 Questions (& PYQs) with Full Explanations (2024-2025 Exam)
Rs. 1600.00 -OR-
3 Year Validity (Multiple Devices)
CoverageDetailsSample Explanation
Help me Choose & Register (Watch Video) Already Subscribed?
Question 265
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Distinguish between the Medullary and Cortical vascular bundles.
EditExplanation
Medullary Vascular Bundle
- Medullary vascular bundle is situated in the peripheral part of the pith of the stem and in some cases extended to the leaf trace.
- They are generally small in size.
- Medullary bundles do not supply to the lateral organs.
- They traverse throughout the length of the stem without any branching.
- Large number of medullary bundle is pr…
… (125 more words) …
Question 266
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Describe the range of thallus structures in Lichens. Lichens are rare or absent in cities. What conclusion can be drawn from this?
EditExplanation
Range Thallus Structures in Lichens
Crustose Lichen
- This type of encrusting lichens with an inconspicuous, thin and flat thallus, firm in texture.
- The thallus is very closely adhered to the substratum and provides a crust like appearance.
- They are wholly or partially embedded in the substratum.
- In the latter case only fruiting bodies are visible above t…
… (218 more words) …
Question 267
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Draw well-labelled diagram of the Male flower of Euphorbia.
EditExplanation
Male Flower of Euphorbia
- In euphobiace the inflorance is cyanthium type. Cyanthium is surrounded by the four or five connate bracts and between these bracts large and often coloured glands are present.
- In middle the single female flower is present and in axil of each bract a number of male flower are arranged in scorpioid cyme.
… (4 more words, 1 figure) …
Question 268
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Comment on the characteristics of Archaea, Bacteria and Eukarya.
EditExplanation
Characteristics of Archaea
- Cell wall- Archaea lack peptidoglycan in its cell wall. it is a distinguishable feature between bacteria and archaea.
- Fatty acid-Archaea has ether bonds connecting fatty acids to molecules of glycerol.
- RNA polymerase complexity-Archaea has multiple RNA polymerase that also contains multiple polypeptides (some have 8 polypept…
… (180 more words) …
Question 269
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Distinguish between the Cladode and Phyllode.
EditExplanation
Cladode
- It is a modification of stem in which a branch of single internode is flatted and becomes leaf like.
- The leaves reduced to scales in the axil of which develops a group of linear, acute, narrow and circular structure.
- They are green and photosynthetic.
- It is a xerophytic adaptation.
Example of cladode-Asparagus.
Phyllode
- Ph…
… (53 more words, 8 figures) …
Question 270
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Differentiate between the Hypanthium and Hypanthodium.
EditExplanation
Hypanthium
- In this type of in Florence the peduncle modified in a narrow cup likes structure.
- At the base of cup the female flower develops whereas at mouth side the male flower develops.
- All three types of flower are present in this in Florence.
Example: Peepal and banyan.
Hypanthodium
- In this type of in Florence the receptacle is flask shaped.
- Receptacl…
… (35 more words) …
Question 271
Appeared in Year: 2016 (IFS)
Describe in Detail Subjective▾
Give the name of the causal organism, symptoms and measures to control a plant disease caused by a bacterium.
EditExplanation
Plant Disease Caused by a Bacterium
Citrus canker
Causal Organism
Xanthomonas Citri
- It is gram negative, Monotrichous, capsulated bacillus which is strictly aerobic in nature.
- It shows a yellow, copiously mucoid growth on 2% sucrose peptone agar but on beef agar colonies are circular and straw yellow to amber yellow.
Symptoms
- Affects all above ground part…
… (174 more words) …
Question 272
Appeared in Year: 2016 (IFS)
Write in Short Short Answer▾
Draw well-labelled diagrams of the winged pollen of Pinus.
EditQuestion 273
Appeared in Year: 2016 (IFS)
Write in Short Short Answer▾
‘’ Vessels of Gnetum are different from the vessels of Angiosperms in origin. ″ Explain critically.
Edit