IFS Botany (Mains): Questions 76 - 83 of 124

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Question number: 76

» Cell Biology » Chromosomes

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Explain the following in about 150 words each: Basic chromosome number may be different from haploid number. (Paper 2 - Section A)

Explanation

  • The number of chromosomes per cell is fixed for a given species.
  • In human beings, the number of chromosome is 46, this is called diploid number where in gametes, and the number of chromosomes is only half of the diploid number and is 23 and is called haploid number. The… (259 more words) …

Question number: 77

» Physiology and Biochemistry » Growth Substances

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Write brief notes on the following in about 150 words each: Allelopathy (Paper 2, Section B)

Explanation

  • Allelopathy is the suppression of growth of one plant species by another or same species due to the release of toxic substances.
  • Allelopathy is a biological phenomenon where one plant inhibits the growth of another.
  • Through the release of allelochemicals, certain plants can greatly affect the growth of other plants… (552 more words) …

Question number: 78

» Physiology and Biochemistry » Fruit Ripening

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Explain various physiological processes that help in fruit ripening. How can this knowledge help overcome problems likely to be faced because of climate change? (Paper 2, Section B)

Explanation

  • Ethylene is a natural plant hormone associated with the growth, development, ripening and aging of many plants.

  • This phytohormone is said to promote ripening in a variety of fruits including bananas, pineapples, tomatoes, mangoes, melons, and papayas.

  • It is produced in varying quantities depending on the type of fruit. But… (571 more words) …

Question number: 79

» Physiology and Biochemistry » Chemiosmotic Theory

Appeared in Year: 2014

Essay Question▾

Describe in Detail

Describe the process explained by chemiosmotic theory. (Paper 2, Section B)

Explanation

Chemiosmosis is the process by which chemical ions move from an area of high concentration to an area of low concentration across a selectively permeable membrane.

  • Chemiosmosis is the process by which ATP, or adenosine triphosphate, is synthesized.

  • The chemiosmotic hypothesis was proposed by Peter D. Mitchell in 1961. In… (464 more words) …

Question number: 80

» Angiosperms » Anatomy

Appeared in Year: 2013

Short Answer Question▾

Write in Short

Draw scientifically accurate diagrams of the following and label the parts: T. S. of any stem showing interxylary and intraxylary phloem (Paper 1, Section B)

Question number: 81

» Angiosperms » Systematics

Appeared in Year: 2013

One Liner Question▾

Write in Brief

Write the botanical name, family and part used of each of the following: Carrot (Paper 1, Section B)

Question number: 82

» Phanerogams » Gymnosperms

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Write brief and critical notes on the following: Affinities of Gymnosperms with Angiosperms (Paper 1, Section B)

Explanation

  • The plants are woody and perennial.

  • The stele is eustelic. Secondary growth as in dicots. The secondary wood may be manoxylic or pycnoxylic.

  • The vascular tissue is well developed, but vessels are absent (except in Gnetum). Phloem is devoid of companion cells.

  • Both are heterosporic and endosporic.

  • Megaspore is retained… (156 more words) …

Question number: 83

» Cryptogams » Pteridophytes

Appeared in Year: 2013

Essay Question▾

Describe in Detail

Discuss briefly the following: Importance of Heterospory (Paper 1, Section A)

Explanation

  • Heterospory is the production of spores of two different sizes and sexes by the sporophytes of land plants.
  • The condition of the production of two kinds of dissimilar spores, differing in shape and size in the same species is termed Heterospory.
  • Two types of spore producing structures in heterosporous species… (246 more words) …

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