Blood is a type of
- A.Epithelial tissue
- B.Muscular tissue
- C.Nervous tissue
- D.Connective tissue
Correct answer
Explanation
The correct answer is D, Connective tissue. Blood is a fluid connective tissue, with cells floating in a liquid matrix called plasma.
Connective tissues link and support other parts of the body, and they have cells spread out in a matrix. In blood, the matrix is plasma, which is about 55 percent of blood and is mostly water with proteins, salts, sugars and hormones. The cells are red blood cells that carry oxygen, white blood cells that fight infection and platelets that help clotting. Blood connects every part of the body by carrying gases, food, wastes and hormones. Lymph is another fluid connective tissue.
A is wrong because epithelial tissue covers the body and lines its organs, with cells packed tightly and almost no matrix.
B is wrong because muscular tissue is made of long fibres that contract to cause movement.
C is wrong because nervous tissue is made of neurons that carry messages as electrical signals.
Exam tip: the four basic animal tissues are epithelial, connective, muscular and nervous; blood and lymph are fluid connective tissues.
Practice Questions
View allWhich one of the following regions in plants is responsible for the growth of its roots and shoots?
- A.Collenchyma
- B.Endodermis
- C.Cortex
- D.Apical meristem
Show answer
Apical meristems sit at the tips of roots and shoots, and their dividing cells make the plant grow in length.
Read the full explanation →Out of different types of tissues found in plants, which one of the following is a complex tissue?
- A.Parenchyma
- B.Sclerenchyma
- C.Xylem
- D.Collenchyma
Show answer
Xylem is made of more than one type of cell working together, which is what makes a tissue complex. Plant permanent tissues are of two kinds.
Read the full explanation →Transport of Na+ and Ca2+ across the plasma membrane is an example of
- A.antiport
- B.symport
- C.uniport
- D.aquaporins
Show answer
In the sodium-calcium exchanger, Na+ ions enter the cell while Ca2+ ions are pushed out, so the two ions cross the membrane in opposite directions.
Read the full explanation →The oxygen evolved during photosynthesis comes from splitting of
- A.water
- B.carbon dioxide
- C.oxygen
- D.light
Show answer
In photosynthesis, the oxygen released into the air comes from water molecules that are split using light energy. Photosynthesis takes place in the chloroplasts of green plants.
Read the full explanation →Which one of the following could be the melting point of iron?
- A.25°C
- B.37°C
- C.500°C
- D.1500°C
Show answer
Pure iron melts at about 1,538°C, so 1,500°C is the only option close to its melting point. Iron is a metal with strong metallic bonds, so a great deal of heat is needed to break up its solid structure.
Read the full explanation →