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.

Radish and carrot represent the correct homologous structures because both have similar design or structure, though both are of different species.

The two versions of a trait which are brought in by the male and female gametes are situated on copies of the same chromosome. Each parent contributes one copy of the gene for a particular trait.

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.

If we dig into the earth and start fnding fossils, the fossils we fnd closer to the surface are more contemporary than the fossils we fnd in deeper layers.

The tendril of a pea plant and the phylloclade of Opuntia are homologous structures, as they are modifed stems but serve diferent functions in diferent plants.

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

Bisexual flowers contains both reproductive organs, male & female.

Bile is secreted by the liver and is stored in the gall bladder from where it enters the small intestine via a common duct.

Rice water contains starch, hence when iodine solution is added to rice water it turns blue-black.

During inhalation, the air is drawn through the nostrils into the nasal passage. From there, air enters into pharynx, larynx, trachea (windpipe), bronchi, lungs and fnally to the alveoli.

Amylase is the enzyme which helps in primary digestion of starch only.Digestion of starch by salivary amylase into maltose starts in mouth. Oesophagus then pushes the food into stomach.

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.