General
✓✗Turpentine oil is extracted from
- Angiosperms
- Pinus
- Oak
- Citrus plants
General
✓✗Statement I: In gymnosperms, pollen grains are carried to the ovules by air currents.
Statement II: In gymnosperms, the male and female gametophytes have an independent, free-living existence.
Choose the correct answer.
Statement II: In gymnosperms, the male and female gametophytes have an independent, free-living existence.
Choose the correct answer.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗Assertion: The resin duct in coniferales is schizogenous in origin.
Reason: Resin duct helps to retain water as well as seals the injured areas of plants.
Reason: Resin duct helps to retain water as well as seals the injured areas of plants.
- If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
- If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
- If Assertion is true, but Reason is false.
- If both Assertion and Reason are false.
General
✓✗Selaginella and Salvinia are considered to represent a significant step toward evolution of seed habit because
- female gametophyte is free and gets dispersed like seeds
- female gametophyte lacks archegonia
- megaspores possess endosperm and embryo surrounded by seed coat
- embryo develops in female gametophyte which is retained on parent sporophyte
General
✓✗In which of the following, gametophyte is not independent free living?
- Pteris
- Pinus
- Funaria
- Marchantia
General
✓✗Assertion: Thallophytes are non-vascular, non-archegoniate, and non-cormophytic plants.
Reason: Thallophytes lack vascular bundles, archegonia, and differentiated plant body.
Reason: Thallophytes lack vascular bundles, archegonia, and differentiated plant body.
- If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
- If both Assertion and Reason are true, but the Reason is not the correct explanation of the Assertion.
- If Assertion is true, but Reason is false.
- If both Assertion and Reason are false.
General
✓✗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
General
✓✗Kelps, some of which may reach a height of 100 m, are
- mosses
- red algae
- green algae
- brown algae
General
✓✗Most algal genera have which type of life cycle?
- Haplo-diplontic
- Diplontic
- Haplontic
- None of these
General
✓✗Algin is a phycocolloid, obtained from the cell wall of
- Macrocystis and Porphyridium
- Mastigocladus and Laminaria
- Microcystis and Nereocystis
- Macrocystis and Fucus
General
✓✗Evolutionary important character of Selaginella is
- heterosporous nature
- rhizophore
- strobili
- ligule
General
✓✗According to Eichler cryptogamia includes
- Gymnosperm and Angiosperm
- Thallophyta and Gymnosperm
- Thallophyta, Bryophyta and Pteridophyta
- Only angiosperm
General
✓✗Match the plant with the kind of life cycle it exhibits:
Choose the correct answer from the options given below :
| List I | List II | ||
| (a) | Spirogyra | (i) | Dominant diploid sporophyte vascular plant, with highly reduced male or female gametophyte |
| (b) | Fern | (ii) | Dominant haploid free-living gametophyte |
| (c) | Funaria | (iii) | Dominant diploid sporophyte alternating with reduced gametophyte called prothallus |
| (d) | Cycas | (iv) | Dominant haploid leafy gametophyte alternating with partially dependent multicellular sporophyte |
- (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)
- (a)-(iv), (b)-(i), (c)-(ii), (d)-(iii)
- (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
- (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
General
✓✗Which one of the following statements is wrong?
- Algae increase the level of dissolved oxygen in the immediate environment.
- Algin is obtained from red algae, and carrageenan from brown algae.
- Agar-agar is obtained from Gelidium and Gracilaria.
- Laminaria and Sargassum are used as food
General
✓✗Agar is used commercially
- as a fuel
- to grow microbes and in the preparation of ice-creams and jellies
- as a source of turpentine
- as a biofertiliser