Optionals IAS Mains Botany: Questions 202 - 211 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 202

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

Draw the well labelled diagram of L. S of strobilus of sleginella and discuss its main feature.

(Paper 2)

Explanation

Sleginella

  • The section of strobilus axis with which is attached micro and megasporophyll.
  • The strobilus shows the presence of both microsporangia and Megasporangia. In some species one side of the strobilus bears microsporangia and other side bears Megasporangia.
  • Usually the Megasporangia are located in the basal portion and the microsporangia in the …

… (88 more words) …

Question 203

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

With the help of suitable diagram, describe the development of sporophyte in bryophyte. (Paper 2)

Explanation

Development of Sporophyte Found in Bryophyte

The Development of Sporophyte in Bryophyte

Question 204

Edit

Appeared in Year: 2014 (IFS)

Describe in Detail

Essay▾

How are Ribosome synthesized? (Paper 2)

Explanation

Ribosome Synthesis

Synthesis of ribosome various component is under genetic control that are Transcripted by genes.

Synthesis of 70s Ribosome

  • The ribosomal genes are in single operon which is transcribed as a unit, to synthesis molecule of RNA containing 16s, 23s, 5s rRNA sequence.
  • rRNA if greatly stabilized and protected by ribosomal proteins and thus…

… (816 more words) …

Question 205

Edit

Appeared in Year: 2014 (IFS)

Describe in Detail

Essay▾

Can an accessory chromosome becomes an essential chromosome? (Paper 2)

Explanation

Accessory Chromosome

  • B chromosomes are a heterogeneous class of chromosome found in nucleus and called accessory chromosome.
  • These accessory chromosomes are not essential chromosome as they are not essential for life as they are not even present in all individuals.
  • B chromosome are different from maker chromosome or additional copies of normal chromos…

… (101 more words) …

Question 206

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

Powdery mildew diseases in plants. (Paper 2)

Explanation

Powdery Mildew Diseases in Plants

  • mildews is disease in with the pathogen grows mostly on the surface of the host and appears in the form of white, grey, brown leaves, youngest and fruits.
  • When the spores are in the form of powdery layer on the host surface, they are called as powdery mildews.

Causal Organism

  • Disease is caused by the member of Erysipha…

… (151 more words) …

Question 207

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

Comment upon the palmella stage. (Paper 2)

Explanation

Palmella Stage

  • A Colonial aggregate of immobile non-flagellated individuals occurring regularly in the life cycle.
  • Unlike coenobial forms, in a palmelloid colony the number of cells, their shape and size is not definite.
  • The cells remain irregularly aggregated within a common mucilaginous matrix.
  • They are independent and function as individuals.
  • In some…

… (50 more words) …

Question 208

Edit

Appeared in Year: 2015 (IFS)

Write in Short

Short Answer▾

What are the salient features of the family Poaceae? (Paper 2)

Question 209

Edit

Appeared in Year: 2014 (IFS)

Describe in Detail

Essay▾

Write a brief note on Fermentation. (Paper 2)

Explanation

Fermentation

  • Fermentation is the incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions where pyruvic acid is converted to CO2 and ethanol.
  • The enzymes, pyruvic acid decarboxylase and alcohol dehydrogenase catalyse these reaction. Some bacteria also form lactic acid and pyruvic acid. Also in some animal cell like …

… (112 more words) …

Question 210

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

What is the importance of VAM? (Paper 2)

Explanation

Importance of VAM

  • VAM is vesicular Arbuscular Mycorrhizal is a fungus which has the ability to dissolve the phosphates that is found abundantly in soil.
  • And hence VAM is work in favour of plants to absorbed nutrients from soil.
  • They are type of Mycorrhiza (symbiotic combination of fungus and plants) .
  • These fungus depend on plants for starch and in ret…

… (128 more words) …

Question 211

Edit

Appeared in Year: 2015 (IFS)

Describe in Detail

Essay▾

Write short notes on the Protoplast fusion. (Paper 2)

Explanation

Protoplast Fusion

  • Protoplast fusion is a type of genetic modification in the plants by which genome of two distinct species of plants are fused together to form new hybrid. That has characteristics of both the species.
  • Protoplast fusion can be obtain either by spontaneous fusion method or induced fusion methods.

Spontaneous Fusion Method

  • During isolati…

… (263 more words) …