Optionals IAS Mains Botany: Questions 120 - 129 of 511

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Question 120

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Appeared in Year: 2013 (IFS)

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Short Answer▾

Write short notes on: Freeze-fracture technique

Question 121

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Appeared in Year: 2013 (IFS)

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Short Answer▾

Write Short Notes on: Extrinsic and Intrinsic proteins

Question 122

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Appeared in Year: 2013 (IFS)

Describe in Detail

Essay▾

Describe the structure and functions of Endoplasmic Reticulum.

Explanation

Endoplasmic Reticulum

  • Definition: The electron microscope reveals an extensive membrane system in the cytoplasm is called endoplasmic reticulum (ER) .
  • The word endoplasmic reticulum was used for a lace-like network of tubules and vesicles observed by Porter, Claude and Fullam in 1945 in the first electron micrograph of cell.

Structure

  • Endoplasmic retic…

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Question 123

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Appeared in Year: 2013 (IFS)

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Write Short Notes on: Ultrastructure of Golgi apparatus and its chemical constituents

Question 124

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Appeared in Year: 2013 (IFS)

Describe in Detail

Essay▾

Write short notes on: Heterosis

Explanation

Heterosis

  • Heterosis is defined as the improvement in performance by individual offspring form the crossing over the performance of the parent population and increase in growth, size, yield or other characters in hybrids over those of the parents.
  • The increased productivity or superiority over the parents is known as Heterosis or hybrid vigour.

History…

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Question 125

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Appeared in Year: 2013 (IFS)

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Write short notes on each of the following: Phytochrome

Question 126

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Appeared in Year: 2013 (IFS)

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Write short notes on each of the following: Apoenzyme

Question 127

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Appeared in Year: 2013 (IFS)

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Write short notes on each of the following: Endangered species

Question 128

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Appeared in Year: 2013 (IFS)

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Short Answer▾

Write short notes on each of the following: Senescence

Question 129

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Appeared in Year: 2014 (IFS)

Describe in Detail

Essay▾

Explain variation in male reproduction structures in liverworts.

Explanation

Male Reproduction Structures in Liverworts

  • Variation in male reproduction structure in liverworts.
  • The Hepaticopsida class is called liverworts. It have two order in it marchantiales and Jungermanniales.
  • To differentiate between Male reproductive structures we have to study them individually.

Riccia

  • The mature antheridium is a globular, oval or club sha…

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