Thorn of Bougainvillea and tendril of Cucurbita are examples of�

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 Multiple Choice QuestionsMultiple Choice Questions

41.

Endosperm is consumed by developing embryo in the seed of 

  • coconut

  • castor

  • pea

  • pea

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42.

Which one of the following is linked to the discovery of Bordeaux mixture as a popular fungicide?

  • Bacterial leaf blight of rice

  • Downy mildew of grapes

  • Loose smut of wheat

  • Loose smut of wheat

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43.

Replum is present in the ovary of flower of 

  • lemon

  • Mustard

  • Sunflower

  • Sunflower

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44.

Thorn of Bougainvillea and tendril of Cucurbita are examples of 

  • analogous organs

  • homologous organs

  • vestigial organs

  • vestigial organs


B.

homologous organs

Thorns of Bougainvillea and tendrils of Cucurbita are homologous organs. These are modified branches and are axillary in position. It means axillary branches in Bougainvillea are modified into thorns for protection from burrowing animals and in Cucurbita into tendrils for climbing.

The analogous organs have the almost similar appearance and perform the same function but t these develop in totally different groups and are totally different in their basic structure and development origin. The phyllode of Ruscus or cladode of Asparagus is analogous to leaves of other plants.

The vesigial or rudimentary organs are useless remnants of structures of organs. which might have been large and functional in ancestors, eg, cutin covered stomata on the stem of cactiplants.

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45.

In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statement is true about archaea? 

  • Archaea resemble eukarya in all respects

  • Archaea have some novel features that are absent in other prokaryotes and eukaryotes

  • Archaea completely differ from both prokaryotes and eukaryotes

  • Archaea completely differ from both prokaryotes and eukaryotes

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46.

Thermococcus, Methanococcus and Methanobacterium emplify

  • archaebacteria that contain protein homologous to eukaryotic core histones

  • archaebacteria that lack any histones resembling those found in eukaryotes but DNA is negatively supercoiled

  • bacteria whose DNA is relaxed or positively supercoiled but which have cytoskeleton as well as mitochondria

  • bacteria whose DNA is relaxed or positively supercoiled but which have cytoskeleton as well as mitochondria

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47.

Which of the following is a slime mould?

  • Rhizopus

  • Physarum

  • Thiobacillus

  • Thiobacillus

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48.

Ergot of rye is caused by a species of

  • Phytophthora

  • Uncinula

  • Ustilago

  • Ustilago

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49.

A genetically engineered micro-organism use successfully in bioremediation of oil spills is a species of

  • Pseudomonas

  • Trichoderma

  • Xanthomonas

  • Xanthomonas

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50.

Which pair of the following belongs to Basidiomycetes?

  • Birds nest fungi and Pufballs

  • Pufballs and Calviceps

  • Peziza and Stink horns

  • Peziza and Stink horns

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