IFS (Forests Services) Botany (Mains): Questions 40 - 48 of 160

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Question number: 40

» Genetics, Molecular Biology and Evolution » Linkage and Crossing Over

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Appeared in Year: 2015

Essay Question▾

Describe in Detail

How will you distinguish cytologically between paracentric inversion and pericentric inversion? (Paper 2, Section A)

Explanation

Paracentric:

  • Paracentric inversions do not occur in the centromere.

  • Crossing over only occurs in the out the loop in one arm of the chromosome.

  • The result is a large loop in where recombination occurs in only part of the loop.

  • When crossover occurs within the loop, it causes the cells to die during meiosis.

  • This means that the

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Question number: 41

» Genetics, Molecular Biology and Evolution » Genetic Code

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Appeared in Year: 2015

Essay Question▾

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Is the genetic code universal? (Paper 2, Section A)

Explanation

What is genetic code?

  • The set of DNA and RNA sequences that determine the amino acid sequences used in the synthesis of an organism’s proteins.

  • The set of 64 codons are corresponding to the 20 amino acids which are used for protein synthesis and as the signals for starting and stopping protein synthesis.

  • It is the biochemical basis of

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Question number: 42

» Cryptogams » Fungi

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Appeared in Year: 2014

Essay Question▾

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What are the different types of flagella found in fungi? (Paper A Section A)

Explanation

  • There are mainly two types of flagella;
Image showing flagella types.

Image Showing Flagella Types.

Based on cilia or hair and fibrils, flagella divided into two parts.

Tinsel type: Flagellum with a large number of hair like outgrowths (cilia) all around its surface.

Whiplash type: A long thread like structure being rigid at the base with 11 fibrils and thinner towa

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Question number: 43

» Physiology and Biochemistry » Storage and Germination of Seed

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Appeared in Year: 2015

Essay Question▾

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Trace the physiological changes associated with the process of seed germination. How is the process of germination regulated by phytohormones? (Paper 2, Section B)

Explanation

Definition of seed germination:

  • The process where the seed sprouts for growing and developing into a plant is called as seed germination.
  • The start of the development of plant from seed is called seed germination.

Physiological changes:

  • A typical seed stores carbohydrates, lipids and proteins for germination.
  • As a result of imbibition and

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Question number: 44

» Cryptogams » Algae

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Appeared in Year: 2014

Essay Question▾

Describe in Detail

What are the pigments that are found in red algae? (Paper A Section A)

Explanation

  • Red algae is also known as Rhodophyta and they are marine plants that live mainly in shallow waters and deep tropical seas and some are live in freshwater.
  • Red algae have no flagella and typically grow attached to a hard surface or on other algae.
 Image showing red algae.

Image Showing Red Algae.

Rhodophyta is also called as red algae and is name for their reddish colour due to their pigments phycoerythrin because this pigment reflects red light and absorbs blue light.

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Question number: 45

» Cryptogams » Bryophytes

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Appeared in Year: 2014

Short Answer Question▾

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What is the heterotrichous habit of moss protonema growth? (Paper A Section A)

Question number: 46

» Cryptogams » Fungi

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Appeared in Year: 2014

Essay Question▾

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How significant is the parasexuality in Aspergillus? (Paper A Section A)

Explanation

Definition of parasexuality or parasexual cycle:

  • The parasexual cycle is defined as a cycle in which plasmogamy, karyogamy and meiosis take place but not at a specified time or at specified points in the life cycle of an organism.
  • In some fungi true sexual cycle comprising of nuclear fusion and meiosis is absent. These fungi derive the benefits

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Question number: 47

» Cell Biology » Techniques

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Appeared in Year: 2015

Short Answer Question▾

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What are ‘carrier proteins’? Describe the ion uptake mechanism in plants mediated by carrier proteins. (Paper 2, Section B)

Question number: 48

» Morphogenesis » Tissue

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Appeared in Year: 2014

Essay Question▾

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Explain to what extent has the technique of micropropagation been successful in achieving our goals. (Paper A Section A)

Explanation

  • The regeneration of whole plant through tissue culture is popularly called micropropagation.
  • This is a technique where a callus mass has been initiated from a single explant taken from any living part of a donor plant and within very short time and space, a large number of plantlets can be produced from such callus tissue.
  • Again repeated it is

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