Description : In the secondary culture, cells are obtained from a. primary culture b. the organism c. organ culture d. phenotypic culture
Last Answer : a. primary culture
Description : The living cells having thickening at the corners due to deposition of pectin are known as
Last Answer : The living cells having thickening at the corners due to deposition of pectin are known as – Collenchyma cells.
Description : Consider the following statements: The genetic code said to be degenerate and universal which means that, (1) Amino afids may have more than one codon (2) All amino acids have mo than one codon (3) Codons are common for higher and lower organism (4) Codons are not found in bacteria
Last Answer : Ans. ((d))
Description : Which of the following statement is correct? (1) The causal organism for foolish seedling disease is the source of gibberellin (2) Abscisic acid is a growth promoter (3) The ratio of auxin : cytokinin control cell differentiation (4) Bolting of cabbage can be induced by treatment with IAA
Description : The formation of multivalents at meiosis in diploid organism is due to: (a) Monosomy (b) Delection (c) Inversion (d) Reciprocal translocation
Description : Lampbrush chromosome was first discovered by a. Ruckert b. Robert c. Ammajan d. Farenten
Last Answer : a. Ruckert
Description : Select the correct statement: (1) C4 pathway for. CO2 fixation were discovered by Hatch and Slack (2) CO2 is essential for photosynthesis (3) Addition of sodium carbonate in water retards photosynthetic rate in vallisneria (4) Phloem is the principal pathway for translocation of solutes
Last Answer : Ans. ((c))
Description : Chondriosome is discovered by: (a) Benda (b) Messelson (c) Dujardin (d) Taylor
Last Answer : Ans. ((a))
Description : Double fertilization in Angiosperms was discovered by
Last Answer : Double fertilization in Angiosperms was discovered by – Nawaschin
Description : What is syngamy? Who discovered it?
Last Answer : Ans: Syngamy is fusion of male and female gametes. It was discovered by Strasburger.
Description : Name the cell organelle associated with photorespiration? Who discovered it?
Last Answer : Ans: Peroxisome, Rhodin
Description : What are mutations? Who discovered them?
Last Answer : Ans: Sudden inheritable change in an organism is called as mutation. They were discovered by Victor Hugo de Vriese.
Description : A newly discovered microscopic structure is hypothesized to be a living organism. Which of the following lines of evidence would support the contention that this organism may be alive? A- .It contains DNA B- It is made of a single cell C- It utilizes energy D- All of these
Last Answer : All of these
Description : Select the correct statement: (a) Legumes are incapable of fixing nitrogen (b) Legumes fix nitrogen through bacteria living in fruits root (c) Legumes fix nitrogen only by bacteria present in nodules (d) None of the above
Last Answer : Ans. (c)
Description : Treatment of the hazardous substances in the environment with the help of living organisms is called as a. Bioremediation b. Waste management c. Waste control d. Biodegradation
Last Answer : a. Bioremediation
Description : Name the living mechanical tissue? What is its function?
Last Answer : Ans: Collenchyma. It helps in providing mechanical strength in aerial parts of dicots. If green, it carries out photosynthesis. Sometimes it is meristematic and gives rise cork cambium in dicot stems at the time of secondary growth.
Description : What is the law of evaporation of water from plant cells ?
Last Answer : Perspiration is the process by which water evaporates from a plant cell.
Description : What are the totiptent stem cells of plants ?
Last Answer : : Totiptent stem is the type of cell from which it is possible to produce plant seedlings directly.
Description : How many types of cells ?
Last Answer : There are two main types of cells based on the type of nucleus. Namely: (1) stem cell. (2) The actual cell.
Description : Consider the following statement: (1) In plant cells, cytokinesis start with the formation of the phragmoplast (2) Phragmoplast comprises intrazonal microtubules and Golgi vesicles (3) Primary cell wall is produced by microtubules (4) Phragmoplast is formed by nucleus
Description : With reference to plant tissue culture select the matching pair: (1) Sterile triploid—banana and seedless fruit (2) Somaclonal variations—differences appearing (3) Embryoids—non-zygatic embryo produced from somatic cells (4) Pulses—belong to cruciferae
Description : Nucleotide found free in the cells is: (a) CAMP (b) AMP (c) ADP (d) ATP
Description : Retort cells are found in: (a) Funaria (b) Pogonatum (c) Sphagnum (d) Porella
Description : Abscission layer developed during leaf fall is made of: (a) Cork cells (b) Sclerenchymatous cells (c) Sclerenchymatous cells (d) Parenchymatous cells
Description : The specific characters of C4 plant is: (a) Bulliform cells (b) Kranz anatomy (c) Parallel venation (d) Isobilateral leaf
Last Answer : Ans. ((b))
Description : Haploid cells belong to: (a) Integument, pollen grain, endosperm (b) Embryo, endosperm and pollen grain (c) Megaspore, pollen grain, antipodal (d) Integument, pollen grain and antipodal
Description : Golgi apparatus is absent in (a) Higher plants (b) Yeast (c) Bacteria and blue-green algae (d) Liver cells
Description : Rod-shaped elongated thick-walled lignified dead cells found in seed coat of pulses (Legumes) are (a) Macrosciereids (b) Astrosclereids (c) Brachysclereids (d) Osteosclereids
Description : Tyloses are: (a) Lactiferous channels (b) Secretory cells (c) Sieve plates (d) Tracheal plugs plugging the lumen of vessels and tracheids
Description : Callus is a. Tissue that forms embryo b. An insoluble carbohydrate c. Tissue that grows to form embryoid d. Unorganized actively dividing mass of cells maintained in cultured
Last Answer : d. Unorganized actively dividing mass of cells maintained in cultured
Description : In Dracaena, the cambium arises from the cells of
Last Answer : In Dracaena, the cambium arises from the cells of - parenchyma outside the outermost vascular bundles
Description : When the diploid embryosac is formed from the cells of nucellus, it is known as
Last Answer : When the diploid embryosac is formed from the cells of nucellus, it is known as – Apospory
Description : When embryo arises directly from the (2n) sporophytic cells like nucellus or integuments it is called as
Last Answer : When embryo arises directly from the (2n) sporophytic cells like nucellus or integuments it is called as – Adventive embryony
Description : When polyembryony is due to activation of some sporophytic cells of ovule, it is called as
Last Answer : When polyembryony is due to activation of some sporophytic cells of ovule, it is called as – Adventive polyembryony
Description : Cells of aleurone layer function for
Last Answer : Cells of aleurone layer function for – hydrolyzing the food material of seeds
Description : In cereals, the layer containing specialized cells filled with starch are called
Last Answer : In cereals, the layer containing specialized cells filled with starch are called – Aleuron layer
Description : Whent the subsidiary or neighboring cells have a common origin with the guard cells such type of stomata ontogeny is called as –
Last Answer : Whent the subsidiary or neighboring cells have a common origin with the guard cells such type of stomata ontogeny is called as – Mesogenous development
Description : In roots, mitotically and metabolically inactive cells that are positioned just behind the root cap are called as
Last Answer : In roots, mitotically and metabolically inactive cells that are positioned just behind the root cap are called as – Quiescent center
Description : Differentiate laticiferous vessels and cells.
Last Answer : Ans: laticiferous cell is smaller, less efficient and coenocyte. Laticiferous vessel is formed by the union of latex cells. It is more efficient and called as syncytium.
Description : What are bulliform cells? What is their role?
Last Answer : Ans: Specialised larger epidermal cells seen in the upper epidermis of grass leaves which store water are called as bulliform cells or motor cells. They help in rolling and unrolling of lamina.
Description : What are the cells found in the egg apparatus of matured embryosac?
Last Answer : Ans: Two synergids and one egg cell
Description : Who discovered the causal organism of the disease Anthrax? -Do You Know?
Last Answer : answer:
Description : When a new organism is discovered, it is classified based on:?
Last Answer : One of two Kingdoms: Animalia and Plantae.
Description : Who discovered Micro Organism?
Last Answer : Anton Van Leeuwenhoek (1675)
Description : Who discovered the causal organism of the disease Anthrax?
Last Answer : Robert Koch
Description : First bionisecticide developed on commercial scale was: (a) Quinine (b) DDT (c) Organophosphates (d) Sporeine
Description : The first reaction in photorespiration is: (a) Decarboxylation (b) Oxygenation (c) Carboxylation (d) Phosphorylation
Description : First CO2 receptor in C4 plants is: (a) PGA (b) PEP (c) RuBD (d) OAA
Description : Ringing experiment was first performed by: a. Godlewski b. Strasburger c. Hartig d. J.C.Bose
Last Answer : c. Hartig
Description : Pollen embryoids were first developed by
Last Answer : Pollen embryoids were first developed by – Guha and Maheshwari