BPSC CCE Prelims
Biology Previous Year Questions (PYQs)
Showing solved Previous Year Questions for Chapter: Biology
Topic Breakdown: Scroll →
Buds are typically found
Detailed Explanation:
Plants have two main types of buds: apical buds (terminal buds) located at the tip of branches that enable vertical growth, and axillary buds (lateral buds) located at the base of leaves in the leaf axil that develop into side branches or flowers.
Therefore, buds are found at both locations – at the tip of branches and at the base of leaves.
The Ishihara test is related with
Detailed Explanation:
The Ishihara test is a widely used medical screening tool designed to detect colour vision deficiency, specifically red-green colour blindness.
It consists of plates with coloured dots that form numbers or patterns visible only to individuals with normal colour vision; those with red-green deficiency fail to identify the hidden figures, making it the standard diagnostic method for colour blindness.
Full form of PHBV biodegradable polymer.
Detailed Explanation:
PHBV stands for Poly(3-hydroxybutyrate-co-3-hydroxyvalerate), a biodegradable copolymer produced by bacterial fermentation.
The prefix "co" indicates it is a copolymer formed from two monomer units: 3-hydroxybutyrate and 3-hydroxyvalerate, making it an eco-friendly alternative to conventional plastics.
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Hormones are secreted by:
Detailed Explanation:
Endocrine glands (such as pituitary, thyroid, adrenal glands) secrete hormones directly into the bloodstream to regulate body functions.
Exocrine glands (like sebaceous and sweat glands) release substances through ducts, not into the blood, so they do not secrete hormones.
A nail is nailed into the trunk of a tree at a point 1 m from the soil level. After 2 years the nail will
Detailed Explanation:
Trees grow in height from apical meristems (shoot and root tips), not by elongating the trunk itself.
The nail remains at 1 m height because secondary growth (cambium activity) only increases girth, not vertical position of existing trunk sections.
Which one of the following terms characterizes the interaction between the herpes simplex virus and a human?
Detailed Explanation:
Parasitism is a biological interaction where the parasite benefits while the host is harmed.
The herpes simplex virus infects human cells, uses the host's cellular machinery to replicate, damages cells, and causes diseases like cold sores or genital herpes, clearly harming the host while benefiting itself — a classic example of parasitism.
Which class of immunoglobulin is the first to be produced in response to an infection?
Detailed Explanation:
IgM (Immunoglobulin M) is the first antibody produced during the primary immune response to a new infection.
IgM has a pentamer structure that enables rapid agglutination and complement activation, providing immediate defense before IgG levels rise in secondary responses.
The biological membranes are composed of:
Detailed Explanation:
Biological membranes consist of a phospholipid bilayer with embedded proteins in varying proportions.
The exact ratio of lipids and proteins is specific to each species, cell type, and organelle – e.g., mitochondrial membranes have different composition than plasma membranes.
Which of the following is a non-sense codon?
Detailed Explanation:
Nonsense codons (also called stop codons) signal the termination of protein synthesis and do not code for any amino acid. The three stop codons are UAA, UAG, and UGA.
AUG is the start codon coding for methionine; UUU codes for phenylalanine; UGC codes for cysteine. Only UAA is a nonsense codon among the given options.
Actual site of dark reaction in photosynthesis inside cytoplast is
Detailed Explanation:
Dark reaction (Calvin cycle) occurs in the stroma of the chloroplast, the fluid-filled region surrounding the grana.
Granum (stacks of thylakoid membranes) and grana lamella (connections between grana) are sites of light reactions, not dark reactions.
Xylem in plants is responsible for following function:
Detailed Explanation:
Xylem is a vascular tissue that transports water and dissolved minerals upward from roots to stems and leaves.
Phloem transports organic nutrients (food and amino acids), while gases diffuse through stomata and intercellular spaces, not through xylem.
Who was first to use the characteristics of vascular tissues in the classification of plants?
Detailed Explanation:
Augustin Pyramus de Candolle was the first botanist to use vascular tissue characteristics (xylem and phloem) for plant classification, dividing plants into vascular (tracheophytes) and non-vascular (bryophytes) groups.
Engler and Prantl developed a phylogenetic system later, while Bentham and Hooker used morphological traits in their natural system, neither being first to use vascular tissues.
The part which we eat in Mango is :
Detailed Explanation:
Mango is a drupe fruit with three layers in its fruit wall (pericarp).
The epicarp is the outer skin, the mesocarp is the thick, fleshy, edible middle layer, and the endocarp is the hard stone surrounding the seed.
We eat the mesocarp – the juicy, sweet flesh of the mango.
In mycorrhizal association, the advantage of plant is :
Detailed Explanation:
Mycorrhizal association is a symbiotic relationship between fungi and plant roots where the fungal hyphae increase root surface area for enhanced mineral absorption (especially phosphorus) and form a protective barrier against soil-borne pathogens.
✅ Option 4 – Correct: Increased mineral absorption and disease protection are the two primary advantages the plant receives from mycorrhizal fungi.
❌ Option 1 – Incomplete: Protection is only one of the benefits.
❌ Option 2 – Incorrect: The plant provides food (carbohydrates) to the fungus, not vice versa.
❌ Option 3 – Incorrect: Combines an incomplete and an incorrect option.
Liver stores
Detailed Explanation:
The liver stores several vitamins essential for bodily functions.
Vitamin A is stored in large quantities (up to 2 years' supply) for vision, immunity, and cell growth.
Vitamin D is stored as calcifediol, regulating calcium absorption and bone health.
Vitamin B12 (cobalamin) is the only water-soluble vitamin significantly stored by the liver (up to 3–5 years' supply), supporting red blood cell formation and nerve function.
Vitamin C (ascorbic acid) is retained in smaller amounts for short-term use in collagen synthesis and immune function.
Thus, the liver stores vitamins A, B (especially B12), C, and D.