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Plant Kingdom · Question 89

AIPMT 2005MCQHard📈 Topic in 50% papers+4−1
1

Ectophloic siphonostele is found in

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

Answer

(1) Osmunda and Equisetum

Solution

A siphonostele is a stele with a central pith surrounded by vascular tissue.

⇒ In an ectophloic siphonostele the phloem lies only on the outer side of the xylem (no inner phloem).

⇒ It occurs in Osmunda and Equisetum.

∵ Marsilea, Adiantum and Dicksonia have amphiphloic siphonostele / solenostele or dictyostele (phloem on both sides of xylem), and the Cucurbitaceae have bicollateral bundles.

Answer: (1)

AIPMT 2005

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2

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
3

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
4

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
5

Which one of the following is living fossil ?

  1. Cycas
  2. Moss
  3. Spirogyra
  4. Saccharomyces
AIPMT 2004
6

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
7

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
8

Sexual reproduction in Spirogyra is an advanced feature because it shows

  1. different sizes of motile sex organs
  2. same size of motile sex organs
  3. morphologically different sex organs
  4. physiologically differentiated sex organs.
AIPMT 2003
9

Plants reproducing by spores such as mosses and ferns are grouped under the general term

  1. cryptogams
  2. bryophytes
  3. sporophytes
  4. thallophytes.
AIPMT 2003
10

Which one pair of examples will correctly represent the grouping spermatophyta according to one of the schemes of classifying plants?

  1. Acacia, sugarcane
  2. Pinus, Cycas
  3. Rhizopus, Triticum
  4. Ginkgo, Pisum
AIPMT 2003
11

Which one of the following is categorised under living fossils ?

  1. Cycas
  2. Metasequoia
  3. Pinus
  4. Selaginella
AIPMT 2003

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