The plant part which exhibits negative geotropism is:(a) root (b) stem (c) branch (d) leaves

Academic Biology NCERT Class 10

(b) stem.

Plant stem grows upward, against the direction of gravity. Hence, it exhibits negative geotropism.

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Updated on: 23-Mar-2023

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(a) Define geotropism. Give one example of geotropism.(b) What is meant by 'positive geotropism' and 'negative geotropism? Give one example of each type. Draw a labelled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.(c) Name one plant part which exhibits positive thigmotropism.
A potted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism.(a) Name the part X of plant.(b) Name the part Y of plant.(c) Which part of the plant, X or Y, will exhibit positive hydrotropism?(d) Which part of the plant, X or Y, can have tendrils on it ?(e) Which phytohormone causes the part X to exhibit negative phototropism?
Describe the process of respiration in the following parts of a plant :(a) Root (b) Stem (c) Leaves
Choose the most appropriate answer.1. A medium-sized plant with a hard, brown, thin stem describes aa. herb. b. shrub. c. tree. d. creeper.2. Which of these plants has a tap root?a. maize b. grass c. wheat d. pea3. Which of these plants stores food in their roots?a. pea b. onion c. carrot d. potato4. The tendril in a pea plant is a modifieda. stem. b. leaf. c. root. d. flower.5. The spines of a cactus plant are modifieda. stems. b. leaves. c. roots. d. flowers.6. In which plant does photosynthesis take place in the stem rather than in the leaves?a. Bougainvillea b. potato c. onion d. cactus7. Which of these is the male part of a flower?a. sepals b. petals c. stamens d. pistil8. Which part of the flower turns into a fruit?a. sepals b. anther c. Ovary d. stigma9. The reproductive organ of a flowering plant is thea. pollen grains. b. flower. c. pistil. d. stamen.10. Which part of a plant regulates its water content?a. root b. stem c. leaf d. flower
The cut part of a plant stem(without roots) which is used in grafting is called:(a)stock (b)stump (c)scion (d)graft
Which of the following terms denotes the movement of the root of a plant towards moisture in the soil?(a) thigmotropism (b) chemotropism (c) hydrotropism (d) geotropism
The growth movement of a plant part in response to the touch of an object is called:(a) thigmonasty (b) hydrotropism (c) thigmotropism (d) geotropism
The movement of a plant part in response to the force of attraction exerted by the earth is called:(a) hydrotropism (b) geotropism (c) chemotropism (d) phototropism
The cut part of plant stem (having roots and fixed to ground) which is used in the process of grafting is known as:(a)stock (b)scion (c)cutting (d)bud
Name the plant hormones which are responsible for the following effects :(a) falling of leaves (b) opening of stomata(c) bending of stem towards light (d) closing of stomata
Name the plant hormones responsible for the following:,b>(a) Elongation of cells(b) Growth of stem(c) Promotion of cell division(d) Falling of senescent leaves
The breathing and respiration in woody stem of a plant takes place through:(a) root hair (b) lenticels (c) closed stomata (d) open stomata
The plant hormone which triggers the fall of mature leaves and fruits from the plant body is:(a) auxin (b) gibberellin (c) abscisic acid (d) cytokinin
The bending of the shoot of a plant in response to light is called: (a) geotropism (b) phototropism (c) thigmotropism (d) photonasty
A parasitic plant with yellow, slender and tubular stem(a) Cuscuta(b) Pitcher plant(c) Golden roads(d) All the above

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