Plant Kingdom Test - 77

Most of the pteridophytes produce similar kinds of spores hence called homosporous.

Genera like Selaginella and Salvinia which produce two kind of spores, macro (large) and small (micro) spores are known as heterosporous.  Microspore and macrospore germinate and gives rise to male and female gametophyte respectively.

The female gametophytes in these plants are retained on the parent sporophyte for variable period.  The development of zygote into young embryo takes place within the female gametophytes.

So, the correct answer is ‘heterosporous species of pteridophytes’.

A.Zoospores – flagellated, motile spores

B.Aplanospoers – Non flagellated,motile spores.

C.Conidia – spores formed exogenously on the conidiophores.

D.Cyst – a thick walled reproductive structure formed during unfavourable conditions.

So, the correct option is ‘zoospores’.

A red algae Polysiphonia shows complicated sexual reproduction because the male gamete called spermatium fuses with the female gamete called carpogonium which retained within the body of female alga. The carpogonium is not released in the water, it is present within the trichogyne. Trichogyne here acts as a style of angiospermic plants. So, they show internal fertilization.

A. Agar-agar- cell wall composed of a mixture of polysaccharides like cellulose, pectose, and algin(non- sulphated phycolloids. Phycocolloids are complex polysaccharides that store in the cell wall of algae, protect them from desiccation and prevent drying or freezing when exposed to air in low tide.

• The primary cell wall of land plants is composed of the polysaccharides cellulose, hemicelluloses, and pectin. 
•  Algae possess cell walls made of glycoproteins and polysaccharides such as carrageenan, cellulose, hemicellulose and pectins and agar that are absent from land plants. In bacteria, the cell wall is composed of peptidoglycan.
• Hence, Algae have cell walls made up of Cellulose, Hemicellulose, and Pectins.

So, the correct answer is 'Cellulose, Hemicellulose and Pectins'.

Correct Option: A

Pteridophytes show sporophytic generation that produces haploid spores, is photosynthetic and differentiated into root, stem and leaves. The haploid spores germinate to produce heart shaped or cordate gametophytes which are nutritionally independent and give rise to male reproductive structure the antheridium and female reproductive structure the archegonium.

1) Middle lamella is a pectin layer and is made up of calcium and magnesium pectates. 

Iodine is found in algae Laminaria in which approximately 7% of total world production of iodine is obtained by which algae.

Phaeophyceae members are brown algae as yellowish brown pigments called xanthophylls is predominant. They are usually marine,multicellular and macroscopic in size. They have motile reproductive cells which are pyriform and have two laterally inserted flagella, one of which is of tinsel type. The reserve food material is carbohydrates, which are always stored in soluble state. Chlorophyll a and c are present in phaeophyceae members. Fucoxanthin, a type of xanthophyll is present in brown algae.