Free Biodiversity and Variety of Life MCQs with Answers

2791. Which of the following is true about bryophytes?

• A. They are thalloid
• B. They possess archegonia
• C. They contain chloroplast
• D. All of these

Explanation: Bryophytes are thalloid, contain chloroplasts, and have archegonia for sexual reproduction.

2792. Bryophytes are dependent on water, because:

• A. Water is essential for their vegetative propagation
• B. The sperms can easily reach up to egg in the archegonium
• C. Archegonium has to remain filled with water for fertilization
• D. Water is essential for fertilization for their homosporous nature

Explanation: Water helps motile sperms swim to reach the egg in archegonium for fertilization.

2793. Bryophytes can be separated from algae, because they:

• A. Possess archegonia
• B. Contain chloroplast
• C. Have thalloid forms
• D. Have no conducting tissue

Explanation: Bryophytes have true multicellular sex organs like archegonia, unlike algae.

2794. Juicy hair-like structures observed in the lemon fruit develop from:

• A. Exocarp
• B. Mesocarp
• C. Endocarp
• D. Mesocarp & endocarp

Explanation: The juicy hair-like structures in lemon are formed from the endocarp, which contains juice-filled cells.

2795. Which of the following statement about plants is incorrect?

• A. All are eukaryotes
• B. They are multicellular
• C. Non-motile organisms
• D. Are heterotrophs

Explanation: Plants are classified as autotrophs. Autotrophs are organisms that produce their own food using inorganic substances, usually through the process of photosynthesis. In the case of plants, they are primary producers that can synthesize organic compounds, such as sugars, from carbon dioxide and water, with the help of sunlight.

2796. The scientific name of Thorn apple is:

• A. Datura stramonium
• B. Datura alba
• C. Solanum nigrum
• D. Nicotiana tabacum

Explanation: This is the correct scientific name for Thorn apple. It's a poisonous flowering plant in the nightshade family (Solanaceae). Other common names for Datura stramonium include Jimsonweed, Devil's trumpet, and Mad apple.

2797. The scientific name of Thorn Apple is:

• A. Sycopodium phlogmaria
• B. Anthocoros fusiform
• C. Ginkgo biloba
• D. Datura alba
• E. Agaricus bisporus

Explanation: The scientific name of Thorn Apple is Datura stramonium. Thorn Apple is a common name for this plant, and it is also known by various other names such as Jimsonweed, Devil's Snare, and Moonflower. Datura stramonium belongs to the Solanaceae family and is known for its trumpet-shaped flowers and spiny fruit capsules. It contains alkaloids with hallucinogenic properties and has a long history of traditional medicinal and ceremonial uses. However, it is important to note that the plant is toxic and can be dangerous if ingested.

2798. Which one of the following statements is correct?

• A. Endothecium produces the microspores
• B. Tapetum nourishes the developing pollen
• C. Hard outer layer of pollen is called intine
• D. Sporogenous tissue is haploid

Explanation: A microsporangium is generally surrounded by four wall layers - the epidermis, endothecium, middle layers and the tapetum. The outer three wall layers perfom the function of protection and help in dehiscence of anther to release the pollen. The innermost wall layer is the tapetum. It nourishes the developing pollen grains. Cells of the tapetum are food rich and possess dense cytoplasm and generally have more than one nucleus. They disintegrate to liberate the contents which is absorbed by the developing spores.

2799. Filiform apparatus is a characteristic feature of:

• A. Suspensor
• B. Egg
• C. Synergid
• D. Zygote

Explanation: Filliform apparatus is a mass of finger like projections of the wall into the cytoplasm. It is present in synergids (help cells) of the embryo sac, in the micropylar region. It guards the pollen tube inside the ovule towards the embryo sac.

2800. Example of bacteria requiring low concentration of oxygen is?

• A. Spirochete
• B. Seudomonas
• C. E.coli
• D. Campylobacter

Explanation: Campylobacter is a genus of bacteria that are mostly microaerophilic, i.e. they require a very low concentration of oxygen to survive. At higher concentrations, these can not survive.