Which one of the following shows isogamy with non-flagellated gametes? 
In Spirogyra, sexual reproduction occurs through conjugation. Gametes are non flagellated morphologically similar but physiologically different (isogamy with physiological anisogamy).
Isogamy with non-flagellated gametes is found in spirogyra:
Which one of the following is wrong about Chara? 
Chara is a multicellular green alga. Sexual reproduction in Chara is oogamous.
Hence, statement 'Upper antheridium and lower oogonium' is incorrect among all the given statements.
Which of the following is responsible for peat formation?
Peat is mainly an accumulation of partially decayed vegetation or organic matter and Sphagnum accumulations can store water since both living and dead plants can hold large quantities of water and living matter like meat for long-distance transport inside their cells hence it is responsible for peat formation.
Schematic of Sphagnum plants:
An alga that can be employed as food for a human being is: 
In which of the following gametophyte is not independent free living? 
Pinus belongs to gymnosperms in which male and female gametophytes do not have an independent free-living existence.
They remain within the sporangia which are of two types:
Read the following five statements (A to E) and select the option with all correct statements: 
(A) Mosses and Lichens are the first organisms to colonize bare rock.
(B) Selaginella is a homosporous pteridophyte.
(C) Coralloid roots in Cycas have VAM.
(D) Main plant body in bryophytes is gametophytic, whereas in pteridophytes it is sporophytic.
(E) In gymnosperms, male and female gametophytes are present within sporangia located on the sporophyte.
Male gametes are flagellated in: [2015 RS]
General intracellular structure of Ectocarpus siliculosus:
Which one of the following statements is wrong? [2015 RS]
Male gametophyte in angiosperms produces: [2015 RS]
Two sperms and a vegetative cell are produced by male gametophyte in angiosperms.
Male Gametophyte of Angiosperm:
In angiosperms, microsporogenesis, and megasporogenesis: [2015 RS]
► Microsporogenesis: The formation of microspores inside the microsporangia of seed plants. A diploid cell in the microsporangium called a micro sporophyte or a pollen mother cell, undergoes meiosis and gives rise to four haploid microspores. Each microspore then develops into a pollen grain.
► Megasporogenesis: The formation of megaspores inside the ovules of seed plants. A diploid cell in the ovule, called a mega sporophyte or a megaspore mother cell, undergoes meiosis and gives rise to four haploid megaspores. In most plants, only one of the megaspores then goes on to develop into a megagametophyte within the ovule, while the other three disintegrate.
► In the ovules of angiosperms, megasporogenesis takes place within a structure called a nucellus, and it is the megaspore farthest from the micropyle of the ovary that survives.
Select the correct statement: 
The tallest trees in the world are redwoods (Sequoia sempervirens), which tower above the ground in California. These trees can easily reach heights of 300 feet (91 meters).
In bryophytes and pteridophytes, transport of male gametes requires: 
In bryophytes and pteridophytes, transport of male gametes requires water. The male gametes, produced by reproductive structures called antheridia, are free-swimming sperm cells that need water to transport them to the female gametes, which are enclosed within structures called archegonia. Because of the need for water, bryophytes are especially common in wet habitats such as bogs, streambanks, and moist forests. However, they are not restricted to these habitats, and some mosses thrive in deserts, above the treeline, and in the Arctic tundra.
Which one of the following statements is wrong: 
Algin is obtained from Laminaria & Fucus – Brown algae while Carrageenan from Chondrus crispus – Red algae.
Conifers are adapted to tolerate extreme environmental conditions because of: 
The presence of thick cuticle, presence of sunken stomata, and needle-like leaves are xerophytic adaptations of conifers for tolerating extreme environmental conditions.
In the prothallus of a vascular cryptogam, the antherozoids and eggs make at different times. as a result: 
In the prothallus of a vascular cryptogamic plant, maturation of antherozoids and eggs takes place at different times and is known as an outbreeding device. As a result of which self-fertilization is prevented and cross-fertilization occurs.