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Plant Kingdom · Question 85

AIPMT 2007MCQMedium📈 Topic in 50% papers+4−1
1

In the prothallus of a vascular cryptogam, the antherozoids and eggs mature at different times. As a result

  1. there is high degree of sterility
  2. one can conclude that the plant is apomictic
  3. self fertilization is prevented
  4. there is no change in success rate of fertilization

Answer

(3) self fertilization is prevented

Solution

The prothallus of a pteridophyte (vascular cryptogam) is the gametophyte bearing antheridia and archegonia.

∵ Antherozoids and eggs of the same prothallus mature at different times (dichogamy) ⇒ an egg cannot be fertilised by antherozoids of its own prothallus.

∴ Self fertilisation is prevented and cross fertilisation is favoured.

Answer: (3)

AIPMT 2007

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2

Peat moss is used as a packing material for sending flowers and live plants to distant places because

  1. it serves as a disinfectant
  2. it is easily available
  3. it is hygroscopic
  4. it reduces transpiration
AIPMT 2006
3

Conifers differ from grasses in the

  1. formation of endosperm before fertilization
  2. production of seeds from ovules
  3. lack of xylem tracheids
  4. absence of pollen tubes
AIPMT 2006
4

In a moss, the sporophyte

  1. manufactures food for itself, as well as for the gametophyte
  2. is partially parasitic on the gametophyte
  3. produces gametes that give rise to the gametophyte
  4. arises from a spore produced from the gametophyte
AIPMT 2006
5

Ectophloic siphonostele is found in

  1. Osmunda and Equisetum
  2. Marsilea and Botrychium
  3. Adiantum and Cucurbitaceae
  4. Dicksonia and Maiden hair fern.
AIPMT 2005
6

Top-shaped multiciliate male gametes and the mature seed which bears only one embryo with two cotyledons, are characterised features of

  1. cycads
  2. conifers
  3. polypetalous angiosperms
  4. gamopetalous angiosperms
AIPMT 2005
7

Phenetic classification of organisms is based on

  1. observable characteristics of existing organisms
  2. the ancestral lineage of existing organisms
  3. dendrogram based on DNA characteristics
  4. sexual characteristics
AIPMT 2004
8

Angiosperms have dominated the land flora primarily because of their

  1. power of adaptability in diverse habitat
  2. property of producing large number of seeds
  3. nature of self pollination
  4. domestication by man
AIPMT 2004
9

Which one of the following is living fossil ?

  1. Cycas
  2. Moss
  3. Spirogyra
  4. Saccharomyces
AIPMT 2004
10

Phenetic classification of organisms is based on

  1. observable characteristics of existing organisms
  2. the ancestral lineage of existing organisms
  3. dendrogram based on DNA characteristics
  4. sexual characteristics.
AIPMT 2003
11

Which one of the following pairs of plants are not seed producers?

  1. Fern and Funaria
  2. Funaria and Ficus
  3. Ficus and Chlamydomonas
  4. Funaria and Pinus
AIPMT 2003

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