CBSE Class X – Science Biology Exam ( Full Syllabus)

The Foremost attribute are always supreme. Tallness is a dominant trait as a single copy of ‘T’ is enough to make the plant tall, while two copies have to be ‘t’ for the plant to be short.

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.

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

Tall plants having round seeds as well as dwarf plants with wrinkled seeds. There were also new combinations like tall plants with wrinkled seeds and dwarf plants with round seeds in the F2 progeny.

The genotype ratio of F2 generation is: TT : Tt : tt = 1 : 2 : 1. Therefore, the ratio of TT and tt plants of F2 generation will be the same. 4. Two pink coloured fowers on crossing resulted

In Rhizopus fungus, the fne thread-like structures that spread on the surface of bread are called hyphae

Cracking of voice in males is due to male hormone testosterone, which is produced after sexual maturation

Sexual reproduction involves fertilisation of male and female gametes to produce zygote having genetic variations. Clones cannot be produced through it as clones are identical copies of parent organism.

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

Organisms look similar because they have similar body designs. As the DNA in the cell nucleus is the information source for making proteins and therefore this information source is changed, different proteins will be made which will lead to altered body designs.

Pseudopodia are developed in amoeba. Amoeba engulfs its food particles by forming pseudopodia around it. The food particle gets surrounded by encircling pseudopodia’s tips.

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 examples and the relation of animal group and heart are as Fishes have two chambered heart and exhibit single circulation while three chambered heart of amphibian and reptiles and four chambered heart of birds and mammals exhibit double circulation.

They convert carbon dioxide and water into carbohydrates in the absence of sunlight Explanation: Autotrophs obtain the required carbon and energy requirements from carbon dioxide and Sunlight. They combine carbon dioxide and water to form carbohydrates

The opening and closing of the pore is a function of the guard cells. The guard cells swell when water fows into them, causing the stomatal pore to open. Similarly, the pore closes if the guard cells shrink.