Botany
- The morphological nature of the edible part of coconut is : Answer: 2. Endosperm The edible white kernel of coconut is its endosperm. Coconut water is free-nuclear liquid endosperm, and the white kern... 1
- Coconut fruit is a : Answer: 4. Drupe Coconut is a drupe: a one-seeded fruit developed from a superior ovary. It has a fibrous mesocarp (husk) and a hard stony e... 1
- In Bougainvillea thorns are the modifications of : Answer: 2. Stem The thorns of Bougainvillea are modified stems (axillary buds changed into hard, pointed thorns). They protect the plant fro... 1
- Which of the following is correctly matched for the product produced by them ? Answer: 3. Saccharomyces cerevisiae : Ethanol Key idea: Match each microbe with a real product. Methanobacterium makes methane (biogas), not... 1
- Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur ? Answer: 2. Chromosomes will not segregate Key idea: APC degrades securin so that separase can cut cohesin between sister chromatids at the m... 1
- Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP ? Answer: 3. Mitochondrion Key idea: ATP is made from the breakdown of food by cellular respiration. The mitochondrion oxidises pyruvate from... 1
- Which ecosystem has the maximum biomass ? Answer: 4. Forest ecosystem Key idea: Biomass depends on the amount and size of the living organisms. A forest has large trees and a very la... 1
- During DNA replication, Okazaki fragments are used to elongate : Answer: 3. The lagging strand away from the replication fork. Key idea: DNA polymerase can add nucleotides only in the 5' to 3' direction. O... 1
- A disease caused by an autosomal primary non-disjunction is : Answer: 4. Down's Syndrome Key idea: Non-disjunction of an autosome gives a trisomy or monosomy of an autosome. Down's syndrome is trisomy 2... 1
- Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement. Answer: 2. Thalassemia is due to less synthesis of globin molecules. Key idea: The two disorders differ in the type of globin defect. Thalas... 1
- Spliceosomes are not found in cells of : Answer: 3. Bacteria Key idea: Spliceosomes remove introns from hnRNA (pre-mRNA) in eukaryotes. Fungi, animals and plants are eukaryotes and... 1
- Phosphoenol pyruvate (PEP) is the primary CO_2 acceptor in : Answer: 1. C₄ plants Key idea: The first CO₂ acceptor differs in C3 and C4 plants. In C₄ plants, phosphoenol pyruvate (PEP) in the mesophyll... 1
- Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by : Answer: 2. Wind Key idea: A single ovule per ovary with flowers packed into an inflorescence is a classic wind-pollination syndrome (e.g. gr... 1
- The vascular cambium normally gives rise to : Answer: 2. Secondary xylem Key idea: Vascular cambium is a lateral meristem that adds cells on both sides. It cuts off secondary xylem inwar... 1
- Select the mismatch :(1) Rhodospirillum - Mycorrhiza(2) Anabaena - Nitrogen fixer(3) Rhizobium - Alfalfa(4) Frankia - Alnus Answer: 1. Rhodospirillum - Mycorrhiza Key idea: Match each microbe with its true role. Rhodospirillum is a photosynthetic purple bacterium... 1
- Which one of the following statements is correct, with reference to enzymes ? Answer: 1. Holoenzyme = Apoenzyme + Coenzyme Key idea: An active conjugated enzyme has a protein part and a non-protein part. The protein pa... 1
- An example of colonial alga is : Answer: 1. Volvox Key idea: Colonial algae have a fixed number of cells living together as one unit. Volvox forms a spherical colony of many... 1
- Alexander Von Humbolt described for the first time : Answer: 2. Species area relationships Key idea: Alexander von Humboldt studied plant diversity in South American forests. He found that spec... 1
- The association of histone H1 with a nucleosome indicates : Answer: 2. The DNA is condensed into a Chromatin Fibre. Key idea: Histone H1 is the linker histone that seals the nucleosome. H1 binds the l... 1
- DNA replication in bacteria occurs : Answer: 2. Prior to fission Key idea: Bacteria have no nucleus and no defined cell cycle phases. They have no nucleolus and no S phase (that... 1
- Among the following characters, which one was not considered by Mendel in his experiments on pea ? Answer: 1. Trichomes - Glandular or non-glandular Key idea: Mendel studied 7 contrasting pairs in pea. Seed colour (green/yellow), pod shape... 1
- The water potential of pure water is : Answer: 4. Zero Key idea: Water potential ( Psi_w ) of pure water at standard conditions is taken as the maximum reference value. It is zero... 1
- Double fertilization is exhibited by : Answer: 3. Angiosperms Key idea: In double fertilisation, one male gamete fuses with the egg (syngamy) and the other with the two polar nucl... 1
- Root hairs develop from the region of : Answer: 4. Maturation Key idea: Root zones from tip upward: root cap, meristematic, elongation, maturation. Cells in the maturation zone dif... 1