Plant kingdom practice · Easy

Option B (Chlorella) is correct because Chlorella is a unicellular green alga known for its high protein and nutrient content, making it suitable for space travelers' food requirements.

Option B (Antheridium) is correct because the antheridium is the multicellular, jacketed male sex organ in plants like bryophytes and pteridophytes.

Option D is correct because Chlorophyceae members have chlorophyll a and b, not chlorophyll a and c.

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because algae increase dissolved oxygen due to oxygenic photosynthesis.

Option C (Cyanobacteria) is correct because cyanobacteria are considered to be the first photosynthetic organisms.

Option A is correct because thallophytes are characterized by a simple thallus body, while they lack an embryo stage.

Option A (Pteridophytes) is correct because they are vascular plants that reproduce via spores (cryptogams).

Option B (Peat (fuel)) is correct because Sphagnum moss is well known for forming peat, which is used as fuel.

Option A (Funaria) is incorrect. The correct answer is Funaria because protonema is the juvenile filamentous state in the life cycle of mosses, and Funaria is a moss.

Option C (2) is correct because during fertilization in angiosperms, the pollen tube releases two male gametes into the embryo sac.

Option B is correct because Chlamydomonas is a unicellular green alga that reproduces asexually by zoospores.

Option C is correct because foot, seta, and capsule are the three main parts of the sporophyte generation in bryophytes (mosses, liverworts, and hornworts).

Option A is correct because chlorophyll-b is present in higher plants and Chlorophyceae (green algae).

Option A (Female sex organ) is correct because archegonium is the female sex organ in bryophytes, pteridophytes, and gymnosperms.

Option A (Laminarin) is correct because Laminarin is the characteristic storage polysaccharide in Phaeophyceae (brown algae).

Option B is correct because both the assertion and reason are true, but the reason does not explain the assertion. The life cycle of Fucus is independent of the life cycle of most algae.

Option C (Both (a) and (b)) is correct because green algae reproduce vegetatively through fragmentation and asexually through different types of spores.

Option A is correct because megasporophyll in gymnosperms is analogous to the carpel in angiosperms, representing the female reproductive structure.

Option C (Chemotaxonomy) is correct because DNA base sequencing is a biochemical characteristic used in chemotaxonomy for classifying organisms.

Option B (If both the assertion and reason are true but the reason is not a correct explanation of the assertion) is correct because both statements are true, but the reason doesn't explain why early systems used superficial characters.

Option A (Pollen grains) is correct. The anther produces pollen grains, which contain the male gametes.

Option B (Bryophytes with simple internal organization) is correct because bryophytes are often referred to as the amphibians of the plant kingdom due to their dependence on water for reproduction and their simple tissue organization.

Option C (Both (a) and (b)) is correct because agar, derived from red algae, is used both as a solidifying agent in microbial culture media and in the preparation of ice creams and jellies.

Option C (They have no ovary) is correct because fruits develop from the ovary, and gymnosperms lack an ovary, hence they do not produce fruits.

Option B (If both the assertion and reason are true but the reason is not a correct explanation of the assertion) is correct because while both statements are true, the reason (being a unicellular green algae) doesn't fully explain why it's used as a food supplement by space travelers. The nutritional value and ease of cultivation are more direct reasons.