CBSE Class X – Science Biology Exam ( Full Syllabus)

The gene type of green stemmed tomato plants is denoted as GG and that of purple stemmed tomato plants as gg. What colour of stem would you expect in F1 progeny when these two are crossed?

A woman has only daughters which

The major function of cellular DNA is

Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria?

Total number of chromosomes along with the sex chromosomes that are present in a human female and a human male.

Name the organ analogous to the wings of birds.

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

In human males, all the chromosomes are match up perfectly except one. These unpaired chromosomes are:

1. Large chromosome
2. Small chromosome
3. Y chromosome
4. X chromosome

Which among the following statements are true for sexual reproduction in fowering plants?

1. It requires two types of gametes.
2. Fertilisation is a compulsory event.
3. It always results in the formation of zygote.
4. Offsprings formed are clone

Example of unisexual fowers.

What is the mode of asexual reproduction in hydra?

What is the mode of asexual reproduction in Amoeba?

What is the mode of asexual reproduction in planaria?

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

Blocking of fallopian tubes prevents ?

Which one of the following declaration is accurate about the human circulatory system?

Which is the true sequence of air passage during inhalation?

Which of the following declaration (s) is (are) true about respiration? (i)During inhalation, ribs move inward and diaphragm is raised. (ii) In the alveoli, exchange of gases takes place i.e. oxygen form alveolar air diffuses into blood and carbon dioxide from blood into alveolar air. (iii) Haemoglobin has greater afinity for carbon dioxide than oxygen. (iv) Alveoli increases surface area for exchange of gases.

In the list of organisms given below, those that reproduce by the asexual method are:

Which of the following statements about the autotrophs is inapropriate:

The ways in which glucose is oxidized to provide energy in various organisms

The main excretony waste removed by kidneys from blood

Respiratory pigment in human body is

Which of the following is an important component of haemoglobin