While bacteria primarily reproduce asexually by fission, they can also undergo a primitive form of sexual reproduction by:
Besides binary fission, bacteria also show a primitive form of sexual reproduction through DNA transfer.
Question 92 of 300
📘 CLASS XI
Which of the following is NOT a typical symptom of a viral infection in plants?
Root nodules are formed due to nitrogen-fixing bacteria and are not symptoms of viral infection.
Question 93 of 300
📘 CLASS XI
The mycelium of fungi belonging to the class Ascomycetes can be correctly described as:
Ascomycetes possess branched and septate mycelium.
Question 94 of 300
📘 CLASS XI
In Basidiomycetes, the structures known as basidia are arranged in specialised fruiting bodies called:
Basidia are borne on specialised fruiting bodies called basidiocarps.
Question 95 of 300
📘 CLASS XI
In a lichen, the heterotrophic fungal component is called the mycobiont. What is its primary role in the symbiotic relationship?
The mycobiont provides shelter and absorbs water and minerals, while the phycobiont prepares food.
Question 96 of 300
📘 CLASS XI
Organisms placed in the Kingdom Plantae possess a cell wall that is primarily made of:
Plant cells are eukaryotic and possess a cell wall mainly composed of cellulose.
Question 97 of 300
📘 CLASS XI
Bacteria are categorised based on their shapes. A bacterium that is comma-shaped belongs to which morphological category?
Comma-shaped bacteria are called Vibrio. Cocci are spherical, bacilli are rod-shaped and spirilla are spiral-shaped.
Question 98 of 300
📘 CLASS XI
Which infectious agents are entirely composed of abnormally folded proteins and cause neurological diseases such as bovine spongiform encephalopathy (BSE)?
Prions are infectious proteins responsible for neurological diseases such as BSE (mad cow disease) and Creutzfeldt-Jakob disease.
Question 99 of 300
📘 CLASS XI
The pigments present in euglenoids are particularly interesting because they are identical to those found in:
Euglenoids possess photosynthetic pigments identical to those found in higher plants.
Question 100 of 300
📘 CLASS XI
Over time, biological classification systems have evolved to become phylogenetic. This means the classification is now based on:
Modern phylogenetic classification considers evolutionary relationships among organisms.
