List of top Biology Questions

Agar-agar is commercially obtained from

Angiosperms differ from gymnosperms in having

Artificial systems gave equal weightage to vegetative and sexual characteristics; this is not acceptable because often ___ characters are more easily affected by environment.

In gymnosperms, the male and female gametophytes do not have independent existence. They remain within the sporangia retained on the sporophyte.

Selaginella and Salvinia are homosporus. Similar kind of spores are produced in Selaginella and Salvinia.

Circinate ptyxis, ramenta and furcate venation are characteristic of

Common example of red algae is

Coralloid roots of___ have symbiotic association with $N_2$ - fixing cyanobacteria.

Cup-shaped chloroplast is present in

Cycas has two cotyledons in its seed, yet it is not placed alongwith dicotyledonous angiosperms because

Cycas is

Each cell of Volvox colony has a structure, similar to

The sporophyte is the dominant phase

Fusion of two motile gametes which are dissimilar in size is termed as

Green algae usually have a rigid cell wall made of an inner layer of ______ and an outer layer of _______.

Gymnosperm called as a living fossil

Gymnosperms do not include

Haplo-diplontic life cycle is found in

Heterospory is found in some members of___ and all members of____ .

Heterosporous pteridophytes show certain characteristics, which are precursor to the 'seed habit' in gymnosperms, One of such characteristics is

In brown algae the flagella are

In double fertilisation, one male gamete fuses with the to form zygote and the other male gamete fuses with to form primary endosperm nucleus.

In Funaria, the haploid structure is

In gymnosperms, pollination occurs by

In gymnosperms, the ovule is naked because