CBSE Class X – Science Biology Exam ( Full Syllabus)

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

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

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

The size of the body is an acquired trait because it depends on nutritional status, health conditions, etc. It can change depending on the Components like availability of less or more food.

One of the conclusions of this theory is that the processes of genetic drift—random change in gene frequency—operate in different ways in two isolated population groups and make them more and more different from each other.

Genes are Detected on the chromosomes, which is present inside the nucleus of the cell in the crytoplasm.

formation of single cell during sexual reproduction by fusion of nuclei of male and female gamates.

Umbilical cord is responsible for exchange of nutrients, oxygen and waste products between the embryo and the mother’s body .

A nephron is a fltering unit present in kidney. It has diferent parts like Bowman’s capsule, glomerulus and tubular region (Renal tubule). Glucose, amino acids and salts are selectively reabsorbed in tubular region.

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

The lime water turns milky on passing carbon dioxide gas into it due to formation of insoluble calcium carbonate. When the exhaled air rich in carbon dioxide is blown from mouth into test tube, it reacts with lime water (calcium hydroxide) to produce calcium carbonate and water

Digestion of food starts in mouth by salivary amylase. From here it enters into the stomach via oesophagus The simpler substances formed by chemical digestion are then absorbed by small intestinal villi.

The oxygen during photosynthesis comes from split water.

The blood leaving the tissues becomes richer in carbon dioxide. When the oxygenated blood passes through the capillaries of the tissue.