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Q. 1 Multiple-Choice Questions  1. Griffith worked on ............. a. Bacteriophage  b. Drosophila   c. Frog eggs  d. Streptococci ANS: d. Streptococci Frederick Griffith was a British bacteriologist who worked on the bacteria Streptococcus pneumoniae, which causes pneumonia. In his famous experiment, he discovered the phenomenon of bacterial transformation, where genetic material could be transferred from one strain of bacteria to another. 2. The molecular knives of DNA are …………..  a. Ligases  b. Polymerases   c. Endonucleases  d. Transcriptase ANS:  c. Endonucleases Endonucleases are enzymes that cleave the phosphodiester bonds within a DNA molecule. They are often referred to as molecular knives because they can cut DNA at specific locations, allowing researchers to manipulate DNA sequences. 3. Translation occurs in the ...............  a. Nucleus  b. Cytoplasm  c. Nucleolus  d. Lysosomes ANS: b. Cytoplasm Tr...

 FLOWER – A FASCINATING ORGAN OF ANGIOSPERMS Flowers have been used for aesthetic, ornamental, social, religious, and cultural purposes. Five ornamental flowers commonly cultivated in homes and in gardens are rose, sunflower, tulip, daisy, and lavender. Five flowers used in social and cultural celebrations can vary but examples include marigold, chrysanthemum, lily, lotus, and peony. Floriculture refers to the cultivation of flowers for ornamental and decorative purposes. The two parts in a flower in which the two most important units of sexual reproduction develop are the stamen and pistil. 1.2 PRE-FERTILISATION: STRUCTURES AND EVENTS Several hormonal and structural changes occur in a plant before it starts to flower. These changes lead to the differentiation and development of the floral primordium. Inflorescences are formed which bear the floral buds and then the flowers. The male and female reproductive structures, the androecium and the gynoecium differentiate and develop in t...

 Biological classification involves grouping organisms together based on shared characteristics and evolutionary relationships. This helps to organize the vast diversity of living organisms and provides a way for scientists to study and understand the relationships between different species. The process of classification is constantly evolving as new information is discovered about the genetics and evolutionary history of living organisms. The basic principles of classification involve grouping organisms together based on shared characteristics and then organizing them into a hierarchy of groups. This hierarchy begins with the smallest unit, the species, and progresses upwards to genera, families, orders, classes, phyla, and kingdoms. The goal of this hierarchical system is to provide a standardized way of categorizing living organisms and to reflect their evolutionary relationships. By organizing living organisms in this way, it becomes easier to study and understand the diversity...

The living world is a complex and fascinating topic that encompasses all living organisms on Earth. From the smallest bacteria to the largest mammals, every living thing is part of a vast and interconnected web of life. Understanding the living world is essential for many reasons, including the conservation of biodiversity, the development of new medicines and technologies, and the exploration of our own origins. In this blog post, we will explore the characteristics of life, the classification of living organisms, the importance of biodiversity, the interactions among living organisms, and much more. By the end of this post, you will have a deeper appreciation for the living world and the role it plays in our lives. The living world refers to all living organisms on Earth, including animals, plants, fungi, bacteria, and archaea. It is a vast and diverse system that is characterized by the ability to grow, develop, reproduce, and adapt to changing environments. The living world is cons...

SECTION - A 1. An infertile couple was advised to undergo In vitro fertilization by the doctor. Out of the options given below, select the correct stage for transfer to the fallopian tube for successful results? (a) Zygote only (b) Zygote or early embryo upto 8 blastomeres (c) Embryos with more than 8 blastomeres (d) Blastocyst Stage EXPLANATION:(b) Zygote or early embryo upto 8 blastomeres 2. Given below are four contraceptive methods and their modes of action. Select the  correct match: (a) a)–(i) b)–(ii) c)– (iii) d)–(iv) (b) a)–(ii) b)–(iii) c)–(iii) d) – (i) (c) a)–(iii) b)–(iv) c)–(ii) d)–(i) (d) a)–(iv) b)–(i) c)– (iii) d)–(ii) EXPLAINATION: (c) a) - iii, b) - iv, c) - ii, d) - i 3 Which of the following amino acid residues will constitute the histone core? (a) Lysine and Arginine  (b) Asparagine and Arginine (c) Glutamine and Lysine  (d) Asparagine and Glutamine EXPLANATION:(a) Lysine and Arginine 4 Evolutionary convergence is development of a (a) common set of fu...