Plant Kingdom - Online Test
Q1. Rhodophyta are commonly called red algae because of the predominance of pigment
Answer : Option A
Explaination / Solution:
The algal class Rhodophyta are commonly called as red algae because it contain red pigment, r-phycoerythrin along with chlorophyll a and d.
Q2. Agar is obtained from
Answer : Option D
Explaination / Solution:
Agar, one of the commercial products obtained from Gelidium are used to grow microbes and in preparations of ice-creams and jellies.
Q3. Largest unicellular organism is
Answer : Option A
Explaination / Solution:
Acetabularia is a genus of green algae, specially of Polyphysaceae family. It is the largest unicellular organism.
Q4. Pond scum is
Answer : Option D
Explaination / Solution:
Green patchy structure that develops around the surface of stagnant water bodies having thread like mass are called pond scum. They are actually a species of green algae ],Spirogyra.
Q5. An algae with ribbon shaped chloroplast
Answer : Option B
Explaination / Solution:
Spirogyra is an algae that have long thread like structure having ribbon shaped chloroplast. Spirogyra is found in stagnant water forming green layer around the surface called pond scum.
Q6. The algae that secretes and deposit calcium carbonate over their walls to contribute in producing coral reefs is
Answer : Option C
Explaination / Solution:
Red algae in the order Corallinales , characterized by a thallus that is hard because of calcareous deposits which contribute in producing coral reefs in sea water.
Q7. Identify the algae present in the figure
Answer : Option C
Explaination / Solution:
The algae present in the figure is Chlamydomonas which is a unicellular algae present in fresh water. Two flagella is attached to it that helps in the movement in water.
Q8. Which of the following is responsible for peat formation?
Answer : Option D
Explaination / Solution:
Sphagnum mosses not only dominate large areas of the boreal peatlands, but they have also formed these habitats by their growth and production of decay-resistant litter. As they invade, they can quickly transform a high-pH fen with little peat accumulation to a bog where large amounts of carbon is stored. They are also responsible for the many types of surface patterns observed in peatlands. Their ability to shape and transform mires can to a large extent be understood from the peculiar anatomy and biochemistry, a fact which makes the links between species’ traits and ecosystem functions in peatlands very strong.
Q9. On germination, moss spore produce
Answer : Option D
Explaination / Solution:
The spore of moss germinate to produce protonema, which is a green, branched and frequently filamentous stage and develops a lateral bud which is called as secondary protonema or a leafy stage.Secondary protonema also gives rise to gametophore initials. Secondary protonema can undergo both sexual and asexual modes of reproduction. It reproduces asexually by the processes of budding and fragmentation. Sexual reproduction is the process which occurs in the leafy stage.
Q10. Asexual reproduction in liverworts takes place by specialised structures, commonly known as
Answer : Option D
Explaination / Solution:
Asexual reproduction in liverworts takes place by the formation of specialised structures called gemmae (sing. gemma). Gemmae are green, multicellular, asexual buds, which develop in small receptacles called gemma cups located on the thalli. The gemmae become detached from the parent body and germinate to form new individuals.
