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

113.

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

How many genome types are present in a typical green plants cell

• More than five

• More than ten

• Two

• Three

Assertion : Algae and fungi are classified as thallophytes.

Reason : They both are autotrophs.

• 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 : Conifer trees produce a large quantity of wind borne pollen grains.

Reason : The pollen grains have wings.

• 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

• seed plants showing abnormal forms of growth and development

• plants described only in fossil state

• plants described in the literature but which Bentham and Hooker did not see in original

• a few orders which could not be placed satisfactorily in the classification.

Which one of the following is correct matching of a plant, its habit and the forest type where it normally occurs?

• Prosopis, tree, scrub

• Saccharum, grass, forest

• Shorea robusta, herb, tropical rain forest

• Acacia catechu, tree, coniferous forest

Which one of the following categories of organisms do not evolve oxygen during photosynthesis

• Red algae

• Photosynthetic bacteria

• C₄ plants with Kranz anatomy

• Blue green algae