CBSE Class X – Science Biology Exam ( Full Syllabus)

What were his fndings with respect to inheritance of traits in F1 and F2 generation by Mendle?

Newly formed DNA copies

What is the phenotypic ratio obtained in Mendels dihybrid cross

The Phenomeneon of Natural Selection was done by

Name the organ analogous to the wings of birds.

Two pink coloured fowers on crossing resulted in 1 red, 2 pink and 1 white fower progeny. The nature of the cross will be:

Choose the statements that describe the characteristics of genes:

1. Genes are specifc sequence of bases in a DNA molecule
2. A gene does not code for proteins.
3. In individuals of a given species, a specifc gene is located on a particular chromosome.
4. Each chromosome has only one gene

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that:

Which among the following diseases is not sexually transmitted?

Slides of binary fission in Amoeba and budding in yeast were given for observa group of students. Some of the observations reported by the group are given below:

1. Cytokinesis was observed in the yeast cell.
2. A chain of buds were observed in Amoeba.
3. Single cell of Amoeba and single cell of yeast were undergoing binary fission and budding respectively
4. Elongated nucleus was dividing to form two daughter nuclei in Amoeba

Assertion (A): Variation is useful for the survival of species over time. Reason (R) : Populations of organisms fill well-defined places in the ecosystem, using their ability to reproduce

Which of the following is a bacterial STD?

A pair of long convoluted tubes that carry ova or eggs from the ovary to the uterus is known as

Which pollination increases genetic uniformity and decreases variations

Which of the following is surgical method of birth control in females?

Blocking of fallopian tubes prevents ?

In the excretory system of human beings, some substances in the beginning fitrate such as glucose, amino acids, salts and water are selectively reabsorbed in:

The organ of the circulatory system in humans.

How many chambers are there in the heart of an amphibian?

Is it necessary to separate oxygenated and deoxygenated blood in mammals and birds.

Which one of the following diets would you recommended to the affected patient?

The main excretony waste removed by kidneys from blood

The hormone whose level in the blood is responsible for the above diabetes

The Fluid collected in the Bowman’s capsule as a result of ultrafiltration is called

Name an enzyme present in pancreatic juice