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
Correct answer
Explanation
The correct answer is C, Xylem. 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. Simple permanent tissues are made of one type of cell: parenchyma, collenchyma and sclerenchyma. Complex permanent tissues are made of several types of cells that work as one unit: xylem and phloem. Xylem has four elements, namely tracheids, vessels, xylem parenchyma and xylem fibres, and it carries water and minerals upward from the roots. Phloem has sieve tubes, companion cells, phloem parenchyma and phloem fibres, and it carries food made in the leaves to other parts of the plant. Together they form the vascular tissue.
A is wrong because parenchyma is a simple tissue of living, thin-walled cells that store food. B is wrong because sclerenchyma is a simple tissue of dead, thick-walled cells that give hardness. D is wrong because collenchyma is a simple tissue that gives flexibility and support to young stems.
Exam tip: simple tissues are parenchyma, collenchyma and sclerenchyma; complex tissues are xylem (water) and phloem (food).
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
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Apical meristems sit at the tips of roots and shoots, and their dividing cells make the plant grow in length.
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
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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
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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
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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 →Blood is a type of
- A.Epithelial tissue
- B.Muscular tissue
- C.Nervous tissue
- D.Connective tissue
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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.
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