Botany MCQs
Topic Notes: Botany
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
1
Through which structures does the Tobacco Mosaic Virus (TMV) move into adjacent plant cells following replication?
Answer:
plasmodesmata
Tobacco Mosaic Virus (TMV) utilizes plasmodesmata, which are microscopic channels connecting the cytoplasm of adjacent plant cells, to facilitate the movement of viral particles and genetic material throughout the host plant tissue during infection.
2
What are the primary modes of transmission for the Human Immunodeficiency Virus (HIV)?
Answer:
All
HIV is transmitted through specific bodily fluids, including blood, semen, vaginal secretions, and breast milk. Consequently, unprotected sexual contact, exposure to infected blood, and vertical transmission from mother to child during breastfeeding are all recognized routes of infection.
3
To which morphological category does the genus Vibrio belong?
Answer:
spiral
Vibrio species are characterized by their curved, comma-like shape. In the classification of bacteria based on morphology, they are generally grouped under spiral or curved forms, distinguishing them from the spherical cocci or the rod-shaped bacilli. This morphology is a key diagnostic feature in microbiology.
4
How many orders are classified under the group Ribovira?
Answer:
two
In certain historical or specific taxonomic classification systems for viruses, Ribovira is categorized into two distinct orders. These systems often group viruses based on their nucleic acid type, specifically those containing RNA as their genetic material.
5
What is the characteristic shape of the Tobacco Mosaic Virus (TMV) capsid?
Answer:
rod
The Tobacco Mosaic Virus (TMV) is a classic example of a helical virus. Its capsid is composed of a single type of protein subunit arranged in a spiral or rod-like structure around the RNA genome. This rod shape is highly stable and protects the viral RNA from degradation by plant enzymes.
6
What are the primary morphological classifications of bacteria based on their shape?
Answer:
all
Bacteria are primarily classified into three main morphological groups based on their shape: cocci (spherical), bacilli (rod-shaped), and spiral (curved or helical). These categories provide a foundational framework for the initial identification of bacterial isolates in both laboratory and natural settings, covering the vast majority of known bacterial forms.
7
A capsid is defined as a protective shell composed of which type of biological molecule?
Answer:
protein
The capsid is the proteinaceous outer shell of a virus. It is constructed from structural protein subunits called capsomeres. These proteins self-assemble around the viral nucleic acid to form a stable, protective enclosure that facilitates the attachment and entry of the virus into host cells.
8
Approximately how many bacterial cells are contained within a single fruiting body?
Answer:
100000
In myxobacteria, the formation of fruiting bodies is a complex developmental process. These structures are multicellular aggregates that can contain a very large number of individual bacterial cells, often estimated in the range of 100,000 or more, which differentiate into spores to survive adverse conditions.
9
Which virus is responsible for causing disease in cotton plants?
Answer:
LCV
LCV stands for Leaf Curl Virus, a significant pathogen affecting cotton crops (Cotton Leaf Curl Virus). HIV and AIDS are human-specific conditions, and Corona virus typically refers to human or animal pathogens.
10
Which of the following pathogens is responsible for causing typhus?
Answer:
rickettsia
Typhus is a group of infectious diseases caused by bacteria of the genus Rickettsia. These bacteria are typically transmitted to humans through the bites of infected arthropods such as lice, fleas, or mites. The infection leads to symptoms like high fever, headache, and a characteristic rash, requiring prompt antibiotic treatment to prevent complications.