Which of the following factors is not a source of variation in living organisms?

A. Environment

B. Inheritance

C. Mitosis

D. Meiosis

Individuals with blood group AB can donate blood to individuals with blood group(s)___________

A. A and B

B. A and O

C. AB only

D. O only

The diagram above is an illustration of a process occurring in a living animal cell. Study it and answer this question
The process occurs in the _______

A. Nucleus

B. Mitochondrion

C. Golgi body

D. Cytoplasm

The process is called_______

A. replication

B. cell maturation

C. crossing over

D. mutation

Which of the following nucleotides is not found in the DNA molecules?

A. Adenine

B. Cytosine

C. Guanine

D. Uracil

In a complete dominance monohybrid cross between a pure breeding yellow-flowered plant Y and a pure breeding white-flowered plant y, the result of the first filial generation is _________

A. 50 % yellow flowers

B. 75% yellow flowers

C. all yellow flowers

D. all white flowers

A man whose blood group is heterozygous B is married to a woman whose blood up is also heterozygous BWhich of the following statements is correct about the blood group of their four offspring?

A. Three of them belong to blood group B

B. Three of them belong to blood group O

C. None of them belongs to blood group O

D. Two of them belong to blood group B

The cross between RrTt and rrtt where R is a gene for red colour and T for tallness will result in______

A. all the offspring being tall with red fruits

B. 25 % tall with red fruits

C. 50 % tall with red fruits

D. 75 % tall with red fruits

The yellow and black stripes on the body of wasps is an example of________

A. mimicry

B. courtship behaviour

C. camouflage

D. warning colouration

The biological importance of the dance by the worker honeybee is that it___________

A. acts as a signal for mating

B. serves as a warning signal

C. signals the availability of food

D. serves as a means of identifying members of the caste