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Q.1. Which of the following algae contains mannitol as reserve food material? (2021)
Q.2. Which of the following pairs include unicellular algae? (2021)
(a) Gelidium and Gracilaria
(b) Anabaena and Volvox
(c) Chlorella and Spirulina
(d) Laminaria and Sargassum
Sol. Chlorella and Spirulina are unicellular green algae, which are commercially very important.
Anabaena is Cyanobacteria, Laminaria, Sargassum, Gelidium, and Gracilaria are multicellular algae. Volvox is unicellular colonial algae.
So, the correct answer is 'Chlorella and Spirulina'
Q.3. Gemmae are present in: (2021)
(a) Some Gymnosperms
(b) Some Liverworts
Sol. Asexual reproduction in liverworts takes place by fragmentation of thalli, or by the formation of specialised structures called gemmae (sing. gemma).
Q.4. Genera like Selaginella and Salvinia produce two kinds of spores. Such plants are known as (2021)
Sol. Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous.
Q.5. Which of the following pairs is of unicellular algae? (2020)
(a) Anabaena and volvox
(b) Chlorella and spirulina
(c) Laminaria and Sargossum
(d) Gelidium and Gracilaria
Sol. Chlorella and spirulina are unicellular algae, rich in proteins and are used as food supplements even by space travelers. These algae also produce nutritional biomass that astronauts could eat.
Q.6. Strobili or cones are found in: (2020)
Sol. Strobilus is a structure present on many land plant species consisting of sporangia-bearing structures densely aggregated along a stem. Equisetum produces strobili.
Q.7. Pinus seed cannot germinate and establish without fungal association. This is because: (2019)
(a) Its seeds contain inhibitors that prevent germination
(b) Its embryo is immature
(c) It has obligate association with mycorrhizae
(d) It has very hard seed coat.
Sol. Pinus has mutualistic association with fungus in the form of mycorrhizae. The fungi help the plant in absorption of essential nutrients from soil and plant provides fungi with high energy yielding carbohydrates.
Q.8. From evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in______. (2019)
Q.9. Which of the following statements is correct? (2018)
(a) Ovules are not enclosed by ovary wall in gymnosperms.
(b) Selaginella is heterosporous, while Salvinia is homosporous.
(c) Horsetails are gymnosperms.
(d) Stems are usually unbranched in both Cycas and Cedrus.
Sol. Gymnosperms have naked ovule. Selaginella and Salvinia both produce two kinds of spores, macro (large) and micro (small) hence, called heterosporous. Equisetum (horsetail, scouring rush) is a pteridophyte. Stems are branched in Cedrus but unbranched in Cycas.
Q.10. Which one is wrongly matched? (2018)
(a) Uniflagellate gametes - Polysiphonia
(b) Biflagellate zoospores - Brown algae
(c) Gemma cups - Marchantia
(d) Unicellular organism - Chlorella
Sol. A non-motile male gamete or spermatium is the characteristic feature of Polysiphonia.
Q.11. An example of colonial alga is: (2017)
Q.12. Select the mismatch. (2017)
(a) Cycas - Dioecious
(b) Salvinia - Heterosporous
(c) Equisetum - Homosporous
(d) Pinus - Dioecious
Sol. Pinus is a monoecious plant, i.e., in Pinus male and female cones or strobili arc borne on the same plant.
Q.13. Zygotic meiosis is characteristic of (2017)
Sol. In Chlamydomonas zygote divides by meiosis. It exhibits haplontic type of life cycle.
Q.14. Life cycles of Ectocarpus and Fucus respectively are: (2017)
(a) Diplontic, haplodiplontic
(b) Haplodiplontic, diplontic
(c) Haplodiplontic, haplontic
(d) Haplontic, diplontic.
Sol. Ectocarpus possesses haplodiplontic whereas Fucus possesses a diplontic life cycle.
Q.11. Conifers are adapted to tolerate extreme environmental conditions because of (2016)
(a) Broad hardy leaves
(b) Superficial stomata
(c) Thick cuticle
(d) Presence of vessels.
Sol. Needle-like leaves with thick cuticles and sunken stomata are xerophytic adaptations of conifers for tolerating extreme environmental conditions.
Q.15. Which one of the following statements is wrong? (2016)
(a) Algae increase the level of dissolved oxygen in the immediate environment.
(b) Algin is obtained from red algae, and carrageenan from brown algae.
(c) Agar-agar is obtained from Gelidiam and Gracilaria.
(d) Laminaria and Sargassum are used as food.
Sol. Alginic acid is obtained from brown algae whereas carrageenan is obtained from red algae.
Q.16. Select the correct statement. (2016)
(a) Sequoia is one of the tallest trees.
(b) The leaves of gymnosperms are not well adapted to extremes of climate.
(c) Gymnosperms are both homosporous and heterosporous.
(d) Salvinia, Ginkgo and Pinus all are gymnosperms.
Q.17. In bryophytes and pteridophytes, transport of male gametes requires (2016)
Sol. The sperms of bryophytes and pteridophytes are flagellated and hence require an external supply of water to reach archegonia.