All Free Biology MCQs with Answers

1741. Monocots are characterized by___________?

• A. Number of sepals and petals are 2 or multiple of 2
• B. Number of sepals and petals are 3 or multiple of 3
• C. Number of sepals and petals are 4 or multiple of 4
• D. Number of sepals and petals are 5 or multiple of 5

Explanation: Monocot flowers commonly have floral parts in threes or multiples of three, such as three or six tepals. Multiples of four or five are more typical of dicot flowers, so students may choose c or d when they focus on common dicot patterns.

1742. The part of sporophyte which is called sporangium is____________?

• A. Capsule
• B. Foot
• C. Stalk
• D. None of these

Explanation: In the bryophyte sporophyte, the capsule is the sporangium because it contains the spore-producing tissue and releases spores. The foot absorbs nutrients and the stalk elevates the capsule, so students may select either of these supporting structures instead.

1743. Microspore of a seed plant that contain male gametophyte including the gamete is called_______________?

• A. Pollen grain
• B. Ovule
• C. Microgametophyte
• D. Microsporangium

Explanation: A pollen grain is the mature or developing male gametophyte of a seed plant and carries the male gametes or the cells that will produce them. An ovule is the female reproductive structure, while a microsporangium produces microspores, so those options represent different structures.

1744. In life cycle of Pinus megaspores produced by megasporangium divide into 4 megaspores by__________________?

• A. Mitosis
• B. Meiosis
• C. Both depending upon the conditions
• D. None of these

Explanation: The diploid megaspore mother cell in Pinus undergoes meiosis, reducing its chromosome number and producing four haploid megaspores. Mitosis produces genetically similar cells without reducing chromosome number, so students may choose it if they overlook the reduction division.

1745. Of the following four options which one is most advanced?

• A. Anthoceropsida
• B. Bryopsida
• C. Hepaticopsida
• D. None of these

Explanation: Anthoceropsida, the hornwort group, is commonly regarded in traditional bryophyte classifications as more advanced than Hepaticopsida and Bryopsida because it has features such as a persistent basal meristem and a more continuously growing sporophyte. Bryopsida may be chosen because mosses appear structurally more complex, but apparent complexity is not the classification criterion used here.

1746. Pinus Taxus and Picea belong to_________________?

• A. Spheospsida
• B. Filicineae
• C. Gymnosperms
• D. Angiosperms

Explanation: Pinus, Taxus, and Picea are seed-producing plants whose ovules are not enclosed inside an ovary, a defining gymnosperm feature. Angiosperms also produce seeds but enclose their ovules within carpels, so students may incorrectly select angiosperms because these plants are all seed plants.

1747. In which group of tracheophytes ovules are born on the exposed surface of megasporophylls______________?

• A. Spheospsida
• B. Filicineae
• C. Gymnosperms
• D. Angiosperms

Explanation: Gymnosperm ovules are borne exposed on the surface of megasporophylls rather than enclosed within an ovary. In angiosperms the ovules are enclosed inside the ovary, so angiosperms are the most likely alternative choice for students who focus only on the presence of ovules.

1748. Protonema is___________?

• A. Thallus like
• B. Algae like
• C. Fungus like
• D. Plant like

Explanation: A protonema is the early, green, filamentous gametophyte of a moss and resembles a simple alga in form. The likely alternative is d, plant-like, because protonema develops into a leafy moss plant, but its initial filamentous structure is specifically algae-like.

1749. Specialized protective coverings around megasporangium which vary in number are called_________________?

• A. Sporangium
• B. Integuments
• C. Ovule
• D. Pericarp

Explanation: Integuments are protective coverings around the megasporangium, or nucellus, and their number can vary among plant groups. The likely alternative is c, ovule, but an ovule includes the megasporangium and integuments rather than referring only to the coverings.

1750. Due to which property of Adiantum and example of Filicinae is called Maidenhairfern________________?

• A. Its short thick branched horizontally growing rhizome
• B. Fibrous adventituous roots arise from the lower side of rhizome
• C. Shows heteromorphic alternation of generation
• D. Stipe (stalk) and rachis of leaf have black smooth and shiny hair like structures

Explanation: Adiantum is called maidenhair fern because its stipe and rachis bear smooth, shiny, black hair-like structures. The likely alternative is a, its rhizome, but the common name refers to the hair-like appearance of the leaf stalk, not the underground stem.