Biology - Study Mode

[#971] Human heart is made up of
Correct Answer

(B) Cardiac muscle

Explanation

Solution: An organ is a group of tissues that work together to perform a specific function. In the case of heart, this function is pumping blood throughout your body. Additionally, the heart is largely made up of a type of muscle tissue called cardiac muscle.

[#972] Antigens 'A' and 'B' are absent in persons belong to blood group
Correct Answer

(A) 'O'

Explanation

Solution: Blood group O has no antigens, but both anti-A and anti-B antibodies in the plasma, as well as some special “anti-A,B' antibodies. Blood group AB has both A and B antigens, but no antibodies.

[#973] Which of the following bacterium causes crown gall disease in plants?
Correct Answer

(B) Agrobacterium tumefaciens

Explanation

Solution: Crown gall is caused by the bacterial plant pathogen, Agrobacterium tumefaciens. Crown gall bacteria enter plant roots through wounds.

[#974] Fossils of blue green algae were found in lime stones with the age almost as old as
Correct Answer

(B) 2.3 Billion years

Explanation

Solution: Fossils of blue green algae were found in lime stones with the age almost as old as 2.3 Billion years.

[#975] They have also proved extremely useful in our quest of knowledge of outer space.
Correct Answer

(C) Yeasts

Explanation

Solution: Yeasts have also proved extremely useful in our quest of knowledge of outer space.