Biology : Plant Kingdom

Which of the following is not an invasive species?

• Parthenium hysterophorus

• Nelumbo (lotus)

• Lantana camara

• Eichhornia crassipes

In which of the following sets of organisms, does the external fertilization occur?

• Echinodermata and mosses

• Hemichordata and ferns

• Amphibians and algae

• Reptiles and gymnosperms

Occurrence of triploid (3n) primary endosperm nucleus is a characteristic feature of

• Algae

• Gymnosperms

• Angiosperms

• Bryophytes

Assertion: The leaves in gymosperms are well adapted to with stand extremes of temperature, humidity and wind.

Reason: Unlike bryophytes and pteridophytes, in gymnosperms the male and female gametophytes do not have an independent free-living existence.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: In basidiomycetes, basidiospores are produced endogenously in the basidium.

Reason: In ascomycetes, ascospores are produced exogenously in ascus.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

Gametophyte and sporophyte are independent of each other in which of the following groups?

• Pteridophytes

• Angiosperms

• Gymnosperms

• Bryophytes

Bacteria, fungi, lower plants survive in adverse conditions by

• diapause

• suspended growth

• migration

• formation of thick walled spores.

Which statement is correct regarding mosses

• They have dominant and independent sporophyte.

• Their antherozoids require water for fertilization.

• Their archegonia produce many eggs.

• Their antherozoids are multiflagellated

Which of the following statements about Spirogyra is correct?

• Lateral conjugation takes place in homothallic species

• Scalariform conjugation takes place in homothallic species.

• Lateral conjugation takes place in heterothallic species

• The type of conjugation is unrelated to homothallic and heterothallic species

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

• Perianth and two integuments

• Embryo development and apical meristem

• Absence of resin duct and leaf venation

• Presence of vessel elements and absence of archegonia