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Plant Kingdom · Question 78

AIPMT 2008MCQMedium📈 Topic in 62% papers+4−1
1

Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms.

  1. Perianth and two integuments
  2. Embryo development and apical meristem
  3. Absence of resin duct and leaf venation
  4. Presence of vessel elements and absence of archegonia

Answer

(4) Presence of vessel elements and absence of archegonia

Solution

Gnetum is a gymnosperm, but unlike Cycas and Pinus it shows some angiosperm features.

⇒ Its xylem contains vessels (as in angiosperms), whereas other gymnosperms have only tracheids in the xylem.

⇒ Archegonia are absent in Gnetum (as in angiosperms), whereas Cycas and Pinus have archegonia in the female gametophyte.

∴ Presence of vessel elements and absence of archegonia distinguish Gnetum and show its affinity with angiosperms.

Answer: (4)

AIPMT 2008

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2

In which one of the following male and female gametophytes do not have free living independent existence?

  1. Polytrichum
  2. Cedrus
  3. Pteris
  4. Funaria
AIPMT 2008
3

Which one of the following is heterosporous?

  1. Adiantum
  2. Equisetum
  3. Dryopteris
  4. Salvinia
AIPMT 2008
4

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
AIPMT 2007
5

Spore dissemination in some liverworts is aided by

  1. indusium
  2. calyptra
  3. peristome teeth
  4. elaters
AIPMT 2007
6

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
7

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
8

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
9

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
10

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
11

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

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All NEET Botany chapters
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