Control and Coordination In Plants | Control and Coordination | Assessment | English | Grade 10

The growth of roots of plants towards water is due to ________

• hydrotropism

• chemotropism

• geotropism

• phototropism

Answer explanation

As we know that growth of roots of plants towards water is due to hydrotropism.

Which hormone inhibits the growth in pants?

• auxin

• gibberellin

• abscisic acid

• cytokinin

Answer explanation

Abscisic acid is the hormone which inhibits the growth of plant.

Which of the following hormone stimulates cell division in plants?

• auxin

• gibberellin

• abscisic acid

• cytokinin

Answer explanation

Cytokinin stimulates cell division in the plants. It is found in fruits and seeds of the plant.

__________ causes growth of tendrill in pea plant.

• effect of light

• effect of gravity

• rapid cell divisions in tendrillar cells in contact with the support

• rapid cell divisions in tendrillar cells that are away from the support

Answer explanation

The growth of tendril in pea plants is because of rapid cell divisions in tendrillar cells that are away from the support.

Choose the incorrect pair among the following.

• Auxin - Growth in the length of the cell

• Ethylene - Inhibits growth of the plant

• Gibberellins - Growth of the shoots

• Cytokinin - Stimulates cell division

Answer explanation

Option 2 is incorrect. Ethylene is responsible for ripening of fruits. Abscisic acid is responsible to inhibit growth of the plants.

Tags

NGSS.MS-LS1-5

Which of the following is example of positive phototropism?

• growth of roots of plants towards water

• growth of roots of plants towards land

• Growth of shoot of plant towards sunlight

• The growth of pollen tubes towards ovules

Answer explanation

Growth of shoot of plant towards sunlight is example of positive phototropism.

Priya planted two plants, plant A and plant B on same day and at same place. She used to water them everyday. But after few days Priya noticed plant A is growing well and well developed but plant B is not growing as expected. Choose correct option related to plant B in given situation.

• Less secretion of hormone auxin.

• More secretion of hormone auxin

• Less secretion of hormone abscisic acid

• More secretion of hormone ethylene

Answer explanation

Hormone auxin is responsible for growth of plants. As plant B is not growing as expected means it has less secretion of auxin. Abscisic acid inhibits the growth of plant, since it is secreted less, it won't affect plant B. Ethylene is responsible for ripening of fruits. Therefore, it will not affect plant B.

Tags

NGSS.MS-LS1-5