CBSE Class X – Science Biology Exam ( Full Syllabus)

Acquired traits are the changes which do not occur in the DNA of the individual or in its genes thus they are not passed from one generation.

Sexual reproduction Require exchange of genetic materials of male and female gametes to form

During sexual reproduction, both mother and father pass their genes to their children, thus determining their traits; or Attribute features

The cross between RR yy and rr YY seeds will obtain RrYy ofspring which will exhibit round and yellow phenotype, as these traits are the dominant ones.

The pair of sex chromosomes is odd as it is not a perfect pair. Women have a perfect pair of sex chromosomes, both called XX while men have a mismatched pair in which one is a normal sized X and the other is a short one called Y.

The sex of the children will be determined by what they inherit from their father. A child who inherits an X chromosome from her father will be a girl and the one who inherits a Y chromosome from him will be a boy

Repeated division of an organism to produce many daughter cells simultaneously.

Budding in which a bud arises from a particular region on a parent body. And after detaching from the parent body the bud grows into a new independent individual

Genes are the unit of heredity DNA that determine genetic characters in an organism.

Hepatitis is not a sexually transmitted disease. It is a water-borne viral disease compared to other options.

The gametes are reproductive cells. They contain only half the number of chromosomes as compared to the normal cells.

Anaerobic respiration (in absence of oxygen) in yeast is known as fermentation as ethanol (alcohol), carbon dioxide and 2 ATP molecules of energy is produced from glucose

Valves prevent backward fow of blood as they are located at each end of two ventricles and act as one way inlet.

Small intestine receives Juices from liver, pancreas and walls of small intestine. Bile Juice from liver emulsifes the fats and makes the medium alkaline. Pancreas and small intestine Juices contain amylase, lipase and tryspin

The oxygen during photosynthesis comes from split water.

Fishes have only two chambers to their hearts, and the blood is pumped to the gills, is oxygenated there, and passes directly to the rest of the body. Thus, blood goes only once through the heart in the fsh during one cycle of passage through the body.

Living organisms are well organised structures; they can have tissues, tissues have cells, cells have smaller components in them, and so on. Living creatures keep repairing and maintaining their structures