Optionals IAS Mains Botany: Questions 60 - 66 of 511
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Question 60
Appeared in Year: 2014 (IFS)
Describe in Detail
Essay▾Stages depicting the formation of vegetative and generative cells during male gametophyte development in angiosperms (Paper - 1, Section - B)
Explanation
Formation of Vegetative and Generative Cells During Male Gametophyte Development in Angiosperms
- Development of male gametophyte starts in pollen grains.
- Microspore undergoes mitotic divisions and forms two unequal cells; vegetative cell and generative cell.
- The larger cell is called vegetative cell and the smaller cell is called generative cell or ger…
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Question 61
Appeared in Year: 2014 (IFS)
Describe in Detail
Essay▾Comment on Plumbago type of embryo sac development. (Paper - 1, Section - B)
Explanation
Tetrasporic Embryosac
- It is formed by all four megaspore nuclei because meiosis is not accompanied by Cytokinesis, so that four nuclei of megaspores are formed.
- All four nuclei are collectively known as “Coenomegaspore” .
- Generally all the four Nuclei of megaspores take part in the formation of the seven celled and eight nucleated embryosac.
- Beside thi…
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Question 62
Appeared in Year: 2014 (IFS)
Describe in Detail
Essay▾Why are gymnosperms called naked-seeded plants? (Paper - 1, Section - B)
Explanation
Gymnosperms as Naked-Seeded Plants
- Gymnosperms do not produce fruit, their seeds are naked or exposed to the elements without a layer of fruit to protect them.
- Gymnosperms are different from angiosperms on the basis of the naked-seed habit and enclosure of seeds within a fruit in the latter.
- Gymnosperm pollen lands directly on the ovule, where in angi…
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Question 63
Appeared in Year: 2014 (IFS)
Describe in Detail
Essay▾Draw scientifically accurate diagrams of the following and label the parts: L. S. of capsule of Funaria (Paper - 1, Section - B)
Explanation
Funaria Capsule
- A mature sporogonium or sporophyte of Funaria is borne at the end of the female branch.
- It differentiated into foot, seta and capsule.
- The capsule is highly organized structure.
- The capsule is pear shaped and spore producing structure.
- Capsule consists of apophysis, annulus, columella, outer and i…
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Question 64
Appeared in Year: 2014 (IFS)
Describe in Detail
Essay▾Draw scientifically accurate diagrams of the following and label the parts: Floral formula and floral diagram of Ranunculaceae and Rosaceae (Paper - 1, Section - B)
Explanation
Ranunculaceae
Rosaceae
Question 65
Appeared in Year: 2014 (IFS)
Describe in Detail
Essay▾Draw scientifically accurate diagrams of the following and label the parts: Anatomy of Pinus needle (Paper - 1, Section - B)
Explanation
Anatomy of Pinus Needle or Pinus Leaf
Epidermis
- Single layered, thick walled and cutinized.
- Stomata are distributed the entire surface of the leaf, so the leaf is described as amphistomatic.
- The guard cells of the stomata are sunken below the level of epidermis.
- Below the stomata there is an air-cavity.
Hypodermis
- Hypoderm…
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Question 66
Appeared in Year: 2014 (IFS)
Describe in Detail
Essay▾Differentiate between Megasporogenesis and megagametogenesis. (Paper - 1, Section - B)
Explanation
Megasporogenesis
- The formation and development of megaspores is called Megasporogenesis.
- The formation of megaspores occurs inside the ovules of seed plants. A diploid cell in the ovule is called megaspore mother cell which is undergoes to the meiosis and form four haploid megaspores.
- In most plants, out of four only one megaspore develops into a mega…
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