Multiple Choice QuestionsThe correct sequence of plants in a hydrosere is
Oak → Lantana → scirpus→Pistia→Hydrilla→Volvox
Volvox → Hydrilla → Pistia → Scirpus → Lantana → Oak
Pista → Volvox → Scirpus → Hydrilla → Oak → Lantana
Pista → Volvox → Scirpus → Hydrilla → Oak → Lantana
Which one of the following is a vascular cryptogam?
Equisetum
Ginkgo
Marchantia
Marchantia
Which one of the following is considered important in the development of seed habit?
Dependent sporophyte
Heterospory
Haplontic life cycle
Haplontic life cycle
Examine the figure A, B, C, and D. In which one of the four options, all the items A, B, C and D are correct.
|
A |
B |
C |
D |
|
Chara |
Marchantia |
Fucus |
Pinus |
|
A |
B |
C |
D |
|
Equisetum |
Ginkgo |
Selaginella |
Lycopodium |
|
A |
B |
C |
D |
|
Selaginella |
Equisetum |
Salvinia |
Ginkgo |
|
A |
B |
C |
D |
|
Selaginella |
Equisetum |
Salvinia |
Ginkgo |
Select one of the following pairs of important features distinguishing Gnetum from Cycas and Pinus and showing affinities with angiosperms
the absence of resin duct and leaf venation
the presence of vessel elements and absence of archegonia
perianth and two integuments
perianth and two integuments
B.
the presence of vessel elements and absence of archegonia
Gnetum resembles angiosperms in many aspects.
i) The leaves in Gnetum have reticulate venation that is an angiosperm character.
ii) The presence of vessels in the xylem is also an angiosperm character and also found n Gnetum.
iii) In Gnetum female gametophyte is only partly cellular before fertilisation and becomes completely cellular only after fertilisation. Some of the free nuclei act as an egg as there is no archegonium.
The short apices in Gnetum and angiosperms show a distinct tunical and corps configuration.
The cortex of stem of Pinus is traversed by large resin ducts or canals. Each duct or canal is linked by a layer of thin -walled parenchymatous glandular secretory cells constituting epithelium. The epithelial cells secrete resin into the canal. The resin is the chief source of turpentine.
Flagellated male gametes are present in all the three of which one of the following sets?
Anthoceros, Funaria and Spirogyra
Zygnema, Saprolegnia and Hydrilla
Fucus, Marsilea and Calotropis
Fucus, Marsilea and Calotropis
In the prothallus of a vascular cryptogam, the antherozoids and eggs mature at different times. As a result
there is no change in success rate of fertilization
there is high degree of sterility
one can conclude that the plant is apomictic
one can conclude that the plant is apomictic
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