Free Biodiversity and Variety of Life MCQs with Answers

2951. In which of the following shapes, gut living symbiont Escherichia coli is found?

• A. Round
• B. Oval
• C. Spiral
• D. Rod

Explanation: Escherichia coli is an example of rod shaped bacteria, also called Bacilli.

2952. Rod-shaped bacteria are known as

• A. Spirilla
• B. Bacilli
• C. Spirochete
• D. Cocci

Explanation: Bacilli are rod shaped bacteria. Cocci are spherical shaped bacteria. Spirillas are corkscrew shaped bacteria. Spirochetes are any group of spiral shaped bacteria.

2953. Cell wall may be absent in which of the following?

• A. Plant & Algae
• B. Algae & Fungi
• C. Fungi & Archaea
• D. Bacteria & Archaea

Explanation: Bacteria and Archaea are the groups where cell walls may be absent. While many bacteria have cell walls, there are some bacteria such as Mycoplasma species, that lack a rigid cell wall. Archaea also have diverse cell envelope structures, and not all of them have a cell wall.

2954. The division of cocci in three planes form Sarcina, which is a cube of _ Cocci?

• A. 02
• B. 04
• C. 08
• D. 16

Explanation: Sarcina is a genus of bacteria that divides in three planes, resulting in the formation of packets of cells arranged in a cube-like structure. These packets, known as tetrads, consist of eight cells arranged in a 3-dimensional cubic configuration. Each of the three planes of division produces four daughter cells, resulting in a total of eight cells in the sarcina packet. Therefore, the cube of cells formed by the division of cocci in three planes is composed of eight individual cells.

2955. Helicobacter pylori is an example of:

• A. Cocci
• B. Bacilli
• C. Pleomorphic
• D. Spiral

Explanation: Helicobacter pylori exists as both a helix-shaped form (classified as a curved rod) and a coccoid form. Hence, it is classified as a pleomorphic bacterium.

2956. The African sleeping sickness is caused by:

• A. Entamoeba histolytica.
• B. Zooflagellates.
• C. Trypanosoma.
• D. Ciliates.

Explanation: African Trypanosomiasis, also known as "sleeping sickness", is caused by microscopic parasites of the species Trypanosoma brucei. It is transmitted by the tsetse fly (Glossina species), which is found only in sub-Saharan Africa.

2957. A large group of parasitic protozoa, some of which causes various diseases such as malaria to humans, are:

• A. Apicomplexans
• B. Annelida
• C. Platyhelminthes
• D. Arthropods

Explanation: Explanation:A large group of parasitic protozoa, some of which causes various diseases such as malaria to humans, are Apicomplexans.Annelids are a phylum of segmented worms that included earthworms, leeches, and various marine worms. They are not parasitic protozoa. Platyhelminthes are a phylum of worms that includes many parasitic species, such as tapeworms and flukes. However, they are not protozoa. Arthropods are a phylum of joint-legged invertebrates that includes insects, spiders, and crustaceans. They are not protozoa, although some Arthropods can be vectors for protozoan diseases (such as mosquitoes and malaria).

2958. Bauthinia variegate (kachnar) belongs to family:

• A. Leguminosae
• B. Soldnacoae
• C. Brassicaceae
• D. Graminea

Explanation: Bauhinia variegata is a species of flowering plant in the legume family, Fabaceae. The Fabaceae or Leguminosae, commonly known as the legume, pea, or bean family.

2959. Raphanus sativus belongs to family :

• A. Poaceae
• B. Fabaceae
• C. Brassicaceae

Explanation: Raphanus sativus, commonly known as radish, belongs to the family Brassicaceae (also known as Cruciferae). Brassicaceae is a family of flowering plants that includes many well-known vegetables and herbs, such as cabbage, broccoli, cauliflower, kale, and mustard.

2960. Lycopersicum esculenium is commonly known as

• A. Gram
• B. Tomato
• C. Potato
• D. Red pepper

Explanation: The correct answer is Tomato. Lycopersicum esculentum is the scientific name for the tomato plant, which is part of the nightshade family Solanaceae. The other options are different species: Gram (chickpea) is a legume, Potato is Solanum tuberosum, and Red pepper is Capsicum annuum, all unrelated to the tomato's scientific designation.