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Plant Kingdom · Question 81

AIPMT 2007MCQMedium📈 Topic in 62% papers+4−1
1

In gymnosperms, the pollen chamber represents

  1. a cavity in the ovule in which pollen grains are stored after pollination
  2. an opening in the megagametophyte through which the pollen tube approaches the egg
  3. the microsporangium in which pollen grains develop
  4. a cell in the pollen grain in which the sperms are formed

Answer

(1) a cavity in the ovule in which pollen grains are stored after pollination

Solution

In gymnosperms the ovule is orthotropous; the pollen grains enter through the micropyle and come to lie in a cavity formed at the tip of the nucellus, called the pollen chamber.

∴ The pollen chamber is a cavity in the ovule in which pollen grains are stored after pollination; there the pollen grain germinates and forms the pollen tube that carries the male gametes towards the archegonia.

∵ The opening through which the pollen tube approaches the egg is the micropyle / archegonial neck, pollen grains develop in microsporangia (pollen sacs) of the microsporophylls, and the sperms are formed from the body cell of the male gametophyte ⇒ (2), (3), (4) are wrong.

Answer: (1)

AIPMT 2007

Keep practising — Plant Kingdom

2

Spore dissemination in some liverworts is aided by

  1. indusium
  2. calyptra
  3. peristome teeth
  4. elaters
AIPMT 2007
3

Flagellated male gametes are present in all the three of which one of the following sets?

  1. Zygnema, Saprolegnia and Hydrilla
  2. Fucus, Marsilea and Calotropis
  3. Riccia, Dryopteris and Cycas
  4. Anthoceros, Funaria and Spirogyra
AIPMT 2007
4

If you are asked to classify the various algae into distinct groups, which of the following characters you should choose?

  1. Nature of stored food materials in the cell
  2. Structural organization of thallus
  3. Chemical composition of the cell wall
  4. Types of pigments present in the cell
AIPMT 2007
5

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
AIPMT 2007
6

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
7

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
8

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
9

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
10

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
11

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

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