Plant science

Description of Plant Quarantine

Plant Quarantine Plant quarantine is defined as the legal enforcement of the measures aimed to prevent pests from spreading or to prevent them from multiplying further in case they have already gained entry and have established in new restricted areas. The first Quarantine Act in the US came into was in 1905, while India passed …

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Plant Breeding – Def, Aim, Objectives

Plant Breeding Definition: Plant breeding is a science based on principles of genetics and cytogenetic. It aims at improving the genetic makeup of the crop plants. Improved varieties are developed through plant breeding. Its objectives are to improve yield, quality, disease-resistance, drought and frost-tolerance and important characteristics of the crops. Objectives of Plant Breeding: Plant …

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MUTATION and it’s TYPES

MUTATIONS Mutation is the change in sequence of nucleotide of DNA. Change in sequence of nucleotide brings sudden change in morphological characteristics of an organism. If such change are heritable, then it is called as mutation. So, mutation is defined as any heritable change in the sequence of nucleotide of DNA. Organism with mutation is …

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Mitochondria – Definition, Function, Structure,

MITOCHONDRIA Definition : Mitochondria (singular: mitochondrion) are organelles within eukaryotic cells that produce adenosine triphosphate (ATP), the main energy molecule used by the cell. For this reason, the mitochondrion is sometimes referred to as “the powerhouse of the cell”. Mitochondria are found in all eukaryotes, which are all living things that are not bacteria or …

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Chloroplast – Definition, Function, Structure,

CHLOROPLAST  Definition: The chloroplast, found only in algal and plant cells, is a cell organelle that produces energy through photosynthesis . The word chloroplast comes from the Greek words khloros, meaning “green”, and plastes, meaning “formed”. It has a high concentration of chlorophyll, the molecule that captures light energy, and this gives many plants and algae a …

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MEIOSIS – 1, 2 and Significance

MEIOSIS Meiosis consists of two divisions, both of which follow the same stages as mitosis (prophase, metaphase, anaphase, telophase) Meiosis is preceded by interphase, in which DNA is replicated to produce chromosomes consisting of two sister chromatids A second growth phase called interkinesis may occur between meiosis I and II, however no DNA replication occurs in this stage …

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MITOSIS – Cell cycle, Stages, Significance

MITOSIS Mitosis is important for sexual reproduction indirectly. It allows the sexually reproducing organism to grow and develop from a single cell into a sexually mature individual. This allows organisms to continue to reproduce through the generations. CELL CYCLE: Actively dividing eukaryote cells pass through a series of stages known collectively as the cell cycle: two gap …

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PRINCIPLES OF PLANT BREEDING

Select the lecture topic… Lec 01 – Aims and objectives… Lec 02 – Modes of Reproduction Lec 03 – Apomixis – classification &… Lec 04 – Modes of Pollination Lec 05 – Classification of plants Lec 06 – Botanical description and… Lec 07 – Maize – Zea mays (2n – 20) Lec 08 – Small Millets Lec 09 – Pulses Lec 10 – Oil Seeds …

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Principles of seed technology..

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POLLINATION:- 1)Autogamy or self pollination and 2) Allogamy or cross pollination.

The process by which pollen grains are transferred from anthers to stigma is referred as pollination. Pollination is of two types: viz. 1) Autogamy or self pollination and 2) Allogamy or cross pollination. I. Autogamy Transfer of pollen grains from the anther to the stigma of same flower is known as autogamy or self pollination. …

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