EducatorSharmin

  Biotechnology Chapter - 14 Biotechnology refers to the use of living organisms or their products to create useful products or processes for various fields such as medicine, agriculture, and industrial applications. This can include genetic engineering, biomanufacturing, and other advanced technologies that allow for the manipulation of biological systems to achieve desired outcomes. Biotechnology involves modification and gene editing technologies to enhance a desired characteristic or to replace a defective gene, resulting in different coloured corns. Scientists manipulate the genes responsible for kernel colour to produce desired traits. Q/A 1. How is culture medium prepared? Ans: For the growth of the plant culture, culture media are made by mixing proper amount of essential minerals nutrients, vitamins, phytohormones, sucrose and condensing substance agar to bring the medium to a semi-solid state.   2. What is tissue culture? Ans: Generally, one or a group of cells of...

  Heredity in Organisms & evolution  Biology Q/A 1. What is RNA? Ans: RNA stands for ribonucleic acid. Most RNA has contained a single polypeptide strand. It is composed of 5 carbon ribose sugar, inorganic phosphate and nitrogen bases (adenine, guanine, cytosine and uracil).    Q.2. Why is chromosome called the physical basis of heredity? Ans: The main heredity material is the chromosome. It is spread in the nucleoplasm of a nucleus as a thread-like structure named the chromatin. The function of chromosomes is to carry genes (which control the characteristics of organisms) to the offspring from the parents. Colours of human eyes, nature of hair, compositions of skin etc. continue intact through the flow of heredity carried by chromosomes. This is why chromosomes are designated as the physical basis of heredity. Q.3. What is gene? Ans: The unit of controlling all the visible and invisible signs and characters of organisms is called the gene. Genes are positio...

Reproduction in Organism Biology Q/A 1. Why are humans called unisexual animals? Ans: Animals which has different reproductive organs for male and female for reproduction are called unisexual animal. In human, male and female has different reproductive organs. For this reason human is called unisexual animal. 2. What is the uterus? What is its function? Ans:  Uterus, also called womb, an inverted pear-shaped muscular organ of the female reproductive system, located between the bladder and the rectum. It  functions to nourish and house a fertilized egg until the fetus, or offspring , is ready to be delivered. 3. What is the placenta? What are the functions of the placenta? Ans: The special organ through which the fetus in the uterus is connected to the tissue of the mother is called the placenta.  Functions of the placenta: a) Allows dissolved food substances ( e.g. glucose, amino acids, minerals salts) and O2 to diffuse from the mother's blood into that of the embryo...