Subject

Biology

Class

ICSE Class 10

Pre Boards

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Sample Papers

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 Multiple Choice QuestionsShort Answer Type

31.

Give the exact location of the following:

(v) Hydathodes


Hydathodes are preset at the margins of the leaves

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32.

With reference to the functioning of the eye, answer the following questions:

(iv) Name the cells of the retina and their respective pigments which get activated (1)
in dark and (2) in light


In the dark the rod cells and their pigment Rhodopsin gets activated.

In the light, the cone cells and their pigment Iodopsin gets activated.

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33.

With reference to the functioning of the eye, answer the following questions:

(i) What is power of accommodation of the eye?


The process of focusing the eye at different distances is called power of accommodation of the eye. The process by which the ciliary muscles change the focal length of an eye lens to focus distant or near objects clearly on the retina is called the accommodation of the eye.

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34.

With reference to the human ear, answer the following questions:

(ii) Name the three small bones present in the middle ear. What is the biological term

for them collectively?


Malleus (lammer), incus (anvil) and stapes (stirrup). The biological term is Ear Ossicles.

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35.

With reference to the human ear, answer the following questions:

(i) Give the technical term for the structure found in the inner ear.


(i) Membranous labyrinth

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36.

Give reasons for the following:

(ii) Urine is slightly thicker in summer than in winter.


During summer, more water is lost in the form of sweat, so there is more reabsorption of
water from the kidney tubules into the blood so as to maintain the concentration of the blood. Thus, the urine is more concentrated and thicker to prevent excessive loss of water ad maintain osmotic balance.
In winter, perspiration is highly reduced, so smaller amounts of water
is reabsorbed by the kidney tubules, making the urine more dilute. 

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37.

Give reasons for the following:

(v) Photosynthesis is considered as a process supporting all life on Earth.


Plants prepare their food by the process of photosynthesis. Herbivores are
dependent on plants for their food. Carnivores depend on herbivores. All animals
directly or indirectly are dependent on plants to obtain food for energy. Therefore,
photosynthesis is considered to be a process supporting all life on Earth.

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38.

Give reasons for the following:

People living in hilly regions usually suffer from simple goitre.


 In hilly regions, the soil is deficient in iodine, thus, the food grown in such soil is iodine deficient. Iodine is necessary for the synthesis of thyroid hormone and simple
goitre is caused by hyposecretion of thyroxine. The deficiency of iodine leads to less production of thyroxine and therefore, people living in hilly regions usually suffer from simple goitre.

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39.

(b) Give reasons for the following:

(iii) Potato cubes when placed in water become firm and increase in size.


Potato cubes absorb water by the process of endosmosis and the cell membrane
acts as a semi-permeable membrane. Due to endosmosis, the potato cubes increase
in size. The turgor pressure increases due to endosmosis of water and thus the cells become turgid and the potato becomes firm.

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40.

Give reasons for the following:

(iv) A matured mammalian erythrocyte lacks nucleus and mitochondria.


A lack of nucleus increases the surface area volume ratio. More erythrocytes can be
accommodated in the same space. At the same time, the oxygen-carrying capacity of
erythrocytes also increases.
Lack of mitochondria ensures that all the oxygen carried by RBCs is transported and delivered to the tissues. Therefore, a mature mammalian erythrocyte lacks a nucleus and mitochondria.

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