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 maleness of a child is determined by the presence of the Y chromo-some in the zygote inherited from the father.

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

Asexual reproduction will not result in variation as there are no gametes involved. Movement of individuals from one habitat to another will not afect the DNA.

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

similarities due to sharing of chromosomes from both the parents variation due to mutuation ,genetic recombination

Flowers are the sexually reproductive organs of a plant and a fertilized flower give rise to fruit

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.

Bisexual flowers contains both reproductive organs, male & female.

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.

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.

Pancreas secretes pancreatic Juice which contains trypsin, lipase and pancreatic amylase. Trypsin digests the proteins, lipase breaks down the fat droplets already emulsifed by bile salts and pancreatic amylase breaks down the starch.

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

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