Optionals IAS Mains Botany: Questions 167 - 175 of 511

Access detailed explanations (illustrated with images and videos) to 511 questions. Access all new questions- tracking exam pattern and syllabus. View the complete topic-wise distribution of questions. Unlimited Access, Unlimited Time, on Unlimited Devices!

View Sample Explanation or View Features.

Rs. 1000.00 -OR-

How to register? Already Subscribed?

Question 167

Edit

Appeared in Year: 2014 (IFS)

Describe in Detail

Essay▾

Write short note on Endemism. (Paper 2)

Explanation

Endemism

  • Species which are restricted in their small region are called endemics. And the phenomena of restricted distribution associated with some geographical or ecological factors are called endemism.
  • Himalaya՚s 28 % of the total dicots are endemic certain important example of Indian endemic plants are Ficus religiosa, bengalensis, Artocarpus nobil…

… (145 more words) …

Question 168

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

Inflorescence of Euphorbiaceae (Paper 2)

Explanation

Inflorescence of Euphorbiaceae is Complex

  • The first branching is generally racemose and the subsequent branching any cymose.
  • In Euphorbia and related genera the inflorance is a cyathium which appears as a single flower.
  • Each cyathium is surrounded by an involucre of four or five connate bracts and between these bracts large and often coloured glands a…

… (111 more words) …

Question 169

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

What is the main basis of classification in algae? Describe the important characters of various classes of algae. (Paper 2)

Explanation

Main Basis of Classification in Algae

  • Various algae՚s are classified into different groups on the basis of pigmentation, flagellation, product stored and method of propagation.
  • But the most accepted classification is based on pigmentation. On the basis of pigment present in the algae the algae is divided into major three groups-
    • Chlorophyceae
    • Phaeophyc…

… (276 more words) …

Question 170

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

Give the salient features of Engler and Prantl՚s system of classification and compare it with that of Bentham and Hooker՚s system of classification. (Paper 2)

Explanation

Engler and Prantl՚S Classification

  • This system is based on Eichler՚s system.
  • It is a phylogenetic system proposed subsequent to the acceptance of theory of decent based on the assumption that the flowering plants where perianth is absent are phylogenetically primitive.
  • They considered Darwinian Theory of descent as their guide.
  • The Monocotyledons prece…

… (246 more words) …

Question 171

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

Describe the asexual reproduction in Penicillium. (Paper 2)

Explanation

Asexual Reproduction in Penicillium

  • Asexual reproduction takes place by the formation of conidia that are non- motile in nature. These conidia are formed in long basipetal chains on conidiophores.
  • The conidiophore Aries as an erect branch from any cell of mycelium.
  • Usually they are divided into one; two or more times forming the branches of different …

… (251 more words) …

Question 172

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

Kranz anatomy (Paper 2)

Explanation

Kranz Anatomy

  • In dry tropical regions plants are adapted to have C4 pathway for photosynthesis.
  • C4 plants have special leaf anatomy. They tolerate high temperature, they show response in highlight intensities, they lack in a process of photorespiration and they also have high productivity.
  • There are large cells around the vascular bundles of the C4 pa…

… (105 more words) …

Question 173

Edit

Appeared in Year: 2014 (IFS)

Describe in Detail

Essay▾

Describe various structural and chemical defence mechanisms developed by plants. (Paper 2)

Explanation

Defence Mechanism Developed by Plants

  • Plants develop defence system against herbivore, parasite, disease causing organism with mechanical wounding, barriers, secondary metabolites and attraction of parasitoids.
  • Herbivores consume plants, so plants have developed a variety of strategies to discourage or kill attackers.
The Defence System

Mechanical Syst…

… (232 more words) …

Question 174

Edit

Appeared in Year: 2014 (IFS)

Describe in Detail

Essay▾

What is accounted for by Lyon՚s hypothesis? Cite an example. (Paper 2)

Explanation

Lyon՚S Hypothesis

  • Whenever the number of X chromosome was two or more than two; the number of Barr bodies was One Less than the number of X chromosomes. Thus, in normal female only one active X chromosome is present.
  • One bare body is present in XX female and XXY male one bare bodies is present.
  • In XXXY male and XXX Meta female two Barr body is present…

… (171 more words) …

Question 175

Edit

Appeared in Year: 2014 (IFS)

Describe in Detail

Essay▾

Describe the adverse anthropogenic effect on terrestrial ecosystem. How can these be mitigated? (Paper 2)

Explanation

Adverse Anthropogenic Effect on Terrestrial Ecosystem

  • Terrestrial ecosystem is a type of ecosystem found only on landforms and due to human activities it is facing lots of adverse effect that making it polluted. The land pollution is caused by solid waste and chemical. There are many examples of plant that has been stripped of vegetation by industri…

… (479 more words) …