Free Biodiversity and Variety of Life MCQs with Answers

3081. Sphagnum is also called as:

• A. Sphenopsida
• B. Peat Moss
• C. Club moss
• D. Maiden hair ferns

Explanation: Sphagnum is also called bog moss or sphagnum moss

3082. Which of the following is not a fern?

• A. Pteris
• B. Tmesipteris
• C. Dryopteris
• D. Pteridium

Explanation: Tmesipteris is actually a genus of ferns belonging to the class Psilotopsida within the sub-division Psilophytina. Tmesipteris is a small genus of ferns that belongs to the class Psilotopsida. Psilotopsida is a class within the division Psilophyta, and this division includes ferns that are often considered primitive vascular plants. The class Psilotopsida includes not only Tmesipteris but also other genera like Psilotum. These ferns are unique because they lack true leaves and roots. Instead, they have small, scale-like appendages on their stems. Tmesipteris, like other members of Psilotopsida, exhibits simple vascular tissues and has a relatively simple overall structure compared to more advanced ferns.

3083. The living phloem, cork and cork cambium is collectively called:

• A. Periderm
• B. Protoderm
• C. Periblem
• D. Bark

Explanation: The living phloem, cork and cork cambium is collectively called Bark.

3084. Closed vascular system is the characteristic of:

• A. Lycopsida
• B. Sphenopsida
• C. Dicot
• D. Monocot

Explanation: Monocots (monocotyledons) typically have a scattered vascular bundle and they are collateral and closed. The vascular bundles in monocots are distributed throughout the stem without a clearly defined ring pattern. This is in contrast to dicots, which often have a ring-shaped arrangement of vascular bundles in their stems.

3085. The sporophyte in bryophyte is:

• A. Haploid
• B. Diploid
• C. Monoploid
• D. Both (B) & (C)

Explanation: In bryophytes, the sporophyte is diploid, which means it has two sets of chromosomes. The sporophyte stage is the part of the life cycle where the plant produces spores through meiosis. These spores develop into the haploid gametophyte stage, which then produces gametes. When fertilization occurs, the gametes combine to form a diploid zygote, which grows into the sporophyte. So, in summary, the sporophyte in bryophytes is diploid.

3086. Carrageenan, a glue like substance from algae is used to produce a thickening agent in _

• A. Cometics
• B. Plastics
• C. Pudding
• D. Medicines

Explanation: Carrageenan is a natural ingredient derived from certain types of red seaweed. It has a unique ability to form a gel-like substance when mixed with liquids, which makes it perfect for thickening puddings. By adding carrageenan to the pudding mixture, it helps give it a smooth and creamy texture that we all love. It's a popular ingredient in many food products, including dessert items like puddings and custards.

3087. The female reproductive cells in bryophytes Is called:

• A. Archegonium
• B. Egg
• C. Oosphere
• D. Both (B) & (C)

Explanation: In bryophytes, the archegonium is the structure that contains the egg cell. It is a flask-shaped structure with a long neck and a swollen base. The neck of the archegonium allows the entry of sperm, which fertilizes the egg. After fertilization, the archegonium protects and nourishes the developing embryo. It's a fascinating part of the reproductive process in bryophytes.

3088. The dichotomous or Y shaped branching is seen in sub phylum:

• A. Lycopsida
• B. Sphenopsida
• C. Psilopsida
• D. Pteropsida

Explanation: The dichotomous or Y-shaped branching is actually seen in the subphylum Psilopsida. It refers to the pattern of branching in the vascular system of certain plants belonging to this subphylum. This type of branching occurs when the main stem divides into two equal branches, resembling the shape of the letter "Y". It's a unique characteristic of Psilopsida plants.

3089. Bacteria reproduce asexually by:

• A. Mitosis
• B. Meioses
• C. Conjugation
• D. Fission

Explanation: Bacteria reproduce primarily by binary fission, an asexual process whereby a single cell divides into two. Under ideal conditions some bacterial species may divide every 10-15 minutes-a doubling of the population at these time intervals.

3090. The simplest oxygen-producing organisms are:

• A. Photosynthetic bacteria
• B. Autotrophic bacteria
• C. Cyanobacteria
• D. Chlamydomenas

Explanation: Cyanobacteria, also known as blue-green algae, are the simplest oxygen-producing organisms. They are a group of photosynthetic bacteria that are capable of carrying out oxygenic photosynthesis.