IGCSE Biology Paper-4: Specimen Questions with Answers 73 - 75 of 279

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Passage

Figure shows a reflex of baby.

Figure Shows a Reflex of Baby

Question 73 (2 of 2 Based on Passage)

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Essay▾

Why reflex in infant is necessary?

Explanation

Reflex is of great clinical significance, especially in terms of the detection of spasticity. It is useful to know normal or abnormal responses of an infant. Grasp reflex of the hands and feet is mediated by a spinal reflex mechanism, which appears to be under the regulatory control of non-primary motor areas by the spinal interneurons.

Question 74

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Define modification of roots? What type of modification of root is present in mangrove trees?

Explanation

Many times roots are changed or modified to serve some other functions like to provide additional support, used as food storage etc. Mangroves trees are mainly present in marshy area. In mangrove plant roots come out vertically to the upper part of ground. These are hollow roots and known as pneumatophores. They facilitate exchange of gases in the roots.

Question 75

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Essay▾

Make a chart related to conservation of biodiversity and also define cryopreservation method.

Explanation

Biodiversity is important at every level of ecosystem. Many protection programs are organized for the conservation of biodiversity.

Image Shows Conservation Methods of Biodiversity

Cryopreservation- Preservation at -196 Degree C (liquid Nitrogen) can maintain tissue culture, Embryo, animal tissues and gametes indefinitely. It is used to prevent endangered organisms are being cryopreserved so that they can be revived to help the conservation.

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