During Anaphase of mitosis , the position of the arms of chromatids are:
1.Towards the equator of the cell
2.Towards the poles of the cell
3.Varies from cell to cell
4.At any place in the cell
Genetics is the study of _____________.
1.development of organism
2.mechanism of inheritance
3.nuclear division
4.variation between species
Identify the figure (ii).
1.Flaccid cell
2.Turgid cell
3.Plasmolysed cell
4.None of these
In which stage of cell division chromosome gets attached to spindle by its centromere?
1. Anaphase
2.Prophase
3.Metaphase
4.Telophase
When an individual has both the genes of a contrasting character, it is said to be
1.Homozygous
2.Heterozygu
3.Phenotype
4.Genotype
Xylem Tissue
1.Transport sugars, proteins, and other organic molecules in plants.
2.Transport of water and dissolved ions from the roots upwards through the plant
3.Fibers provide support
4. Both 1 and 2
A normal human body contains ____________ group of chromosomes and the number of sex chromosomes in a sex cell of a being is ______________.
1.44, 22
2.23,2
3.23, 22
4.46,2
Alleles
1.Alternate forms of genes
2.Linked genes
3.Chromosomes that have crossed over
4. Homologous chromosomes
Cho0se the correct numbering given to different cell division stages of mitosis
1.B-Metaphase, C-Early anaphase
2.A- Metaphase, B- Metaphase
3.A-Prophase, C-Early anaphase
4. Both 4 and 3
Chromatin
1.A substance within a chromosome consisting of DNA and uncondensed protein.
2.A long DNA molecule with part or all of the genetic material of an organism.
3.A double helix, composed of repeating nucleotides join to other strands via hydrogen bonds.
4.The point of attachment of two chromatid sisters.
Damage and errors in DNA cause _________________ .
1.mutation
2.DNA repair
3.translation
4.transcriotion
DNA threads which appear inside the nucleus during cell division
1.Spindle fibers
2.Centriols
3.Asters
4.Chromosomes
During photosynthesis, energy, absorbed from sunlight is stored as chemical energy in biomolecules.
1.ATP ADP
2.ATP,NADPH
3.NAD,NADP
4.NADH2,ATP
Epiblema
1.The central part of a plant root
2.Outermost layer of protective cells in a root
3.Extensions of the roots arising from the epidermis
4.A separation between the xylem and phloem
Histones
1.Proteins that help in coiling and packaging of RNA into nucleosomes
2.Encode particular proteins which express in the form of a trait
3.Proteins that help in coiling and packaging of DNA Into nucleosomes.
4.Help in sex determination.
Hydathodes
1.Epidermis of leaf, young stem and floral parts
2.Margins of leaf where the vascular supply ends
3.Adaxial or abaxial surfaces of leaves
4.Both 2 and 3
Identify the figure (i)
1.Flaccid cell
2.Turgid cell
3. Plasmolysed cell
4.None of these
Lenticels
1.Permit the entrance of oxygen from the plants
2.Permit the output of carbon dioxide and water vapor in the plants
3.Promote gas exchange of oxygen, carbon dioxide and water vapor
4.All of the above
Marine fish when placed in tap water bursts because of:
1.Endosmosis
2.Exosmosis
3.Diffusion
4.Plasmolysis
Mesophyll cells
1.Located above the upper epidermis
2.Located between the upper and lower epidermis
3.Located below the lower epidermis
4.Located above the upper and below the lower epidermis
Mitosis produces ______________daughter cells and meiosis produces____________daughter cells .
1. 2,2
2.2,4
3.4, 2
4.4,4
Osmosis
1.Movement of solute molecules through a semi-permeable membrane from region of their higher concentration to the lower concentration region.
2.Movement of solvent molecules through a semi-permeable membrane from region of their higher concentration to the lower concentration region.
3. Movement of solvent molecules through a semi-permeable membrane from region of the. lower concentration to the higher concentration region.
4.Movement of solute molecules through a semi-permeable membrane from region of their lower concentration to the higher concentration region.
Osmotic pressure
1.Maximum pressure exerted to prevent the passage of pure solvent into the solution separated by a semi permeable membrane.
2.Minimum pressure exerted to prevent the passage of pure solvent into the solution separated by a semi permeable membrane.
3.Minimum pressure exerted to prevent the passage of pure solute into the solution separated by a semi permeable membrane.
4.Maximum pressure exerted to prevent the passage of pure solute into the solution separated by a semi permeable membrane
Phenomena responsible for rupturing coats of germinating seeds
1.Osmosis
2.Diffusion
3.Assimilation
4.Imbibition
Phenomena responsible for rupturing coats of germinating seeds
1.Osmosis
2.Diffusion
3.Assimilation
4.Imbibition
Phosphorylation
1.Addition of phosphate to NADP to form NADPH.
2.Addition of phosphate to adenosine diphosphate (ADP) to form adenosine triphosphate (ATP)
3.Removal of phosphate from adenosine triphosphate (ATP) to form adenosine diphosphate (ADP)
4.Removal of phosphate from NADP to form NADPH
Rate of transpiration increases with:
1.Intensity of sunlight, high atmospheric CO level. high water content
2.Closure of stomata, high atmospheric CO level, velocity of wind
3. Intensity of sunlight, dry air, high water content
4.Opening of stomata, high atmospheric CO level, shedding of leaves
Root hair
1.Extension of metaxylem
2.Extension of epidermis
3.Extension of cortex
4.Extension of pith
Stomata
1.Transpiration and translocation
2. Exchange of gases and excretion
3.Transpiration and exchange of gases
4.Photosynthesis and translocation
Synapsis
1.Pairing of acentric chromosomes during mitosis
2.Pairing of non-homologous chromosomes during meiosis
3.Pairing of any chromosomes during mitosis
4.Pairing of homologous chromdsomes during meiosis
The condensation of chromosomes IS observed in _____________.
1.Prophase I
2.Anaphase
3.Metaphase
4.None of these
The leaves of certain plants exhibit droplets of water along their margin in the warm humid conditions.
1.Bleeding
2.Guttation
3.Transpiration
4.Evaporation
The plants die due to wilting when:
1.Available light is reduced to half
2. Xylem is blocked
3.Few roots are broken
4.Phloem is blocked
The process of conversion of ADP into ATP during photosynthesis
1.Photolysis
2.Polymerization
3.Photophosphorylation
4.None of these
The sequence of cell cycle is
1. S, MG and G
2.GSG and M
3.G G S and M
4.MG G and S
Thylakoids
1.In the fret of chloroplast
2.Wall of the chloroplast
3.In the chlorophyll
4.In the stroma of the chloroplast
Water regulation within the plant cell occurs through the process:
1.Osmosis
2.Diffusion
3.Active transport
4.Transpiration
Which of the following is the logical sequence for the root showing the cell to cell conduction of water?
1.Root hair ------> Endodermis-----> Soil water------> Xylem ------>Cortex
2.Xylem------> Cortex -------->Endodermis------> Root hair------> Soil water
3.Soil water----------> Root hairs-----------.Cortex ------------>Endodermis Xylem
4.Cortex ----------->Endodermis ------------->Xvlem----------> Root hair Soil water
Which of the statements define Cytokinesis?
1.A division of cytoplasm
2.All nuclear changes during cell division
3.Cleavage furrow deepen totally in animal cell
4. All of these