CBSE Class 9 Biology Tissues MCQs Set 07

Answer: (c) Cells with similar structure, common origin and performing similar functions

Explanation:
1. A tissue is a group of cells with a similar structure and common origin that perform a particular function.

Teacher's Note:
1. Cells of a tissue work together.
2. Organs are made of different tissues.

Answer: (d) They store reserve food material

Explanation:
1. Meristematic cells are small, thin-walled, with dense protoplasm and no intercellular spaces.
2. They divide actively and do not store reserve food.

Teacher's Note:
1. They have a prominent nucleus and small or no vacuoles.
2. They are found at growing regions.

Answer: (d) Lateral meristem

Explanation:
1. Lateral meristems (cambium) add to the thickness (girth) of the stem and root.

Teacher's Note:
1. Apical meristem increases length.
2. Cambium causes secondary growth.

Answer: (c) Intercalary meristem

Explanation:
1. Intercalary meristem lies at the base of internodes and leaves and increases the length of the internodes.

Teacher's Note:
1. It is found in grasses.
2. It helps the plant regrow after grazing.

Answer: (d) Vascular cambium

Explanation:
1. The vascular cambium lies between the xylem and phloem and adds new xylem and phloem.

Teacher's Note:
1. Cork cambium forms the cork.
2. It causes secondary growth.

Answer: (b) Collenchyma

Explanation:
1. Collenchyma is living and has cell walls thickened at the corners, which gives mechanical support.
2. Sclerenchyma is also mechanical but dead, and parenchyma is not a mechanical tissue.

Teacher's Note:
1. Collenchyma gives flexibility to young stems.
2. Sclerenchyma gives rigidity.

Answer: (c) It has protoplasm

Explanation:
1. Collenchyma cells contain living protoplasm, which makes it a living tissue.

Teacher's Note:
1. Dead sclerenchyma has no protoplasm.
2. The thickened corners contain pectin and cellulose.

Answer: (c) Chlorenchyma

Explanation:
1. Parenchyma containing chloroplasts is called chlorenchyma and carries out photosynthesis.

Teacher's Note:
1. Aerenchyma has large air spaces.
2. It is found in the leaves.

Answer: (d) Having pectin cell walls and protoplasm

Explanation:
1. Collenchyma cells have pectin-rich cell walls and living protoplasm.
2. Sclerenchyma cells have lignified walls and are dead.

Teacher's Note:
1. The thickening in collenchyma is uneven.
2. Sclerenchyma has no protoplasm when mature.

Answer: (a) Parenchyma

Explanation:
1. Succulents store water in the large, thin-walled cells of the parenchyma.

Teacher's Note:
1. Parenchyma also stores food.
2. Aerenchyma helps floating of aquatic plants.

Answer: (b) Sclereids

Explanation:
1. Sclereids (stone cells) are short, very hard sclerenchyma cells that make the shell of walnut hard.

Teacher's Note:
1. They are also found in pear fruit pulp.
2. Fibres are long and thin.

Answer: (c) Lignin

Explanation:
1. Sclerenchyma cells are strengthened with lignin.

Teacher's Note:
1. Lignin makes the walls hard and waterproof.
2. These cells are dead at maturity.

Answer: (a) Phloem

Explanation:
1. Sieve tubes are the conducting cells of the phloem and carry food.

Teacher's Note:
1. Xylem carries water.
2. Companion cells help sieve tubes.

Answer: (d) Sieve tube

Explanation:
1. Companion cells lie beside the sieve tube elements and control their activity.

Teacher's Note:
1. Sieve tubes lack a nucleus.
2. The companion cell has a nucleus.

Answer: (a) Xylem

Explanation:
1. Tracheids, vessels, xylem fibres and xylem parenchyma make up the xylem.

Teacher's Note:
1. They carry water.
2. They are dead and lignified.

Answer: (d) Cork

Explanation:
1. Cork cells are dead and filled with suberin.
2. Xylem, phloem and epidermis contain living cells.

Teacher's Note:
1. Cork is protective tissue.
2. Suberin makes cork waterproof.

Answer: (d) Xylem parenchyma

Explanation:
1. Xylem parenchyma, which is living, conducts water sideways (laterally) and stores food.

Teacher's Note:
1. Tracheids and vessels conduct water upwards.
2. Xylem fibres give support.

Answer: (d) Sieve tube

Explanation:
1. A mature sieve tube element is living but has no nucleus.

Teacher's Note:
1. It is helped by the companion cell.
2. Tracheids and sclereids are dead.

Answer: (b) Gives mechanical strength

Explanation:
1. Xylem fibres and the lignified walls of tracheids and vessels give mechanical strength.

Teacher's Note:
1. Phloem conducts organic food.
2. Xylem also stores food in parenchyma.

Answer: (a) Albuminous cells

Explanation:
1. Gymnosperms lack companion cells; their sieve cells are associated with albuminous (Strasburger) cells.

Teacher's Note:
1. Angiosperms have companion cells.
2. Albuminous cells perform the same function.

Answer: (d) a-(iv), b-(ii), c-(v), d-(i), e-(iii)

Explanation:
1. Collenchyma has walls thickened with cellulose and pectin, parenchyma stores food, and sclerenchyma has lignin deposits.
2. Xylem, a complex tissue, conducts water and phloem fibres are thick-walled sclerenchymatous cells giving support.

Teacher's Note:
1. Complex tissues are xylem and phloem.
2. Phloem fibres are sclerenchyma.