Which of the following groups of algae produces algin?

• Phaeophyceae and Chlorophyceae

• Rhodophyceae and Phaeophyceae

• Chlorophyceae and Rhodophyceae

• Phaeophyceae only

Assertion: Presence of large amounts of nutrients in water body causes excessive growth of planktonic algae.

Reason: It is due to biomagnification.

• 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.

103.

Assertion : Sphagnum is slowly carbonised, compressed and fossilised over thousands of years to produce a dark spongy mass called peat.

Reason : Peat helps to keep soil porous and it also improves water holding capacity of the soil.

• 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

Which of the given genera is homosporous

• Cycas

• Pinus

• Selaginella

• Lycopodium

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