Give one example each of a plant part :(a) which is positively hydrotropic as well as positively geotropic.(b) which is positively phototropic but negatively geotropic.

Academic Biology NCERT Class 10

(a) Roots - positively hydrotropic as well as positively geotropic.

(b) Shoots - positively phototropic but negatively geotropic.

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Updated on: 24-Mar-2023

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Name the plant organs which are :(a) positively phototropic (b) positively geotropic(c) negatively geotropic(d) positively hydrotropic
The root of a plant is:(i) positively phototropic but negatively geotropic(ii) positively geotropic but negatively phototropic(iii) negatively phototropic but positively hydrotropic (iv) negatively hydrotropic but positively phototropic(a) (i) and (ii) (b) (ii) and (iii) (c) (iii) and (iv) (d) (i) and (iv)
(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.
Which part of the plant is known as the food factory of the plant?
Give one example of the movement of a plant part which is caused by the loss of water (or migration of water).
(a) Define a combination reaction.(b) Give one example of a combination reaction which is also exothermic.(c) Give one example of a combination reaction which is also endothermic.
Name one gland each:(a) which acts only as an endocrine gland.(b) which acts only as an exocrine gland.(c) which acts both as an endocrine gland as well as an exocrine gland.
Name the positively charged particle present in the atoms of all the elements.
Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.
Out of xylem and phloem, which one carries materials :(a) upwards as well as downwards ? (b) only upwards?
Name one example of the movement of a plant part which is very quick and can be observed easily.
Which of the following carries substances upwards as well as downwards in a plant?(a) xylem (b) companion cells (c) phloem (d) tracheids
ABCD is a rectangle in which diagonal AC bisects $\angle A$ as well as $\angle C$. Show that, (i) ABCD is a square (ii) Diagonal BD bisects $\angle B$ as well as $\angle D$.
Give one example of a situation in which a body has a certain average speed but its average velocity is zero.
Give one example of a physical change in which energy is given out, and one example of physical change in which energy is absorbed?

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