OBJECTIVE TYPE QUESTIONS:

1. Put a tick (✓) against the most appropriate alternative in the following statements.

(i) In a cactus plant, photosynthesis occurs in:
(a) leaves
(b) spines
(c) modified roots
(d) modified stem

(ii) The animals such as birds have:
(a) light bones with air cavities
(b) solid heavy bones
(c) heavy pointed bones
(d) no bones

(iii) The biotic components of the environment include:
(a) green plants
(b) animals
(c) decomposers
(d) all of these

(iv) The presence of hollow plant stems is a characteristic of:
(a) desert plants
(b) aquatic plants
(c) mountainous trees
(d) none of these

(v) Slow breathing is a characteristic of:
(a) desert animals
(b) aquatic animals
(c) aerial animals
(d) land animals

Photosynthesis in cactus plants occurs in the stem to reduce water loss. Birds possess light bones with air cavities for flight. Biotic components of the environment encompass green plants, animals, and decomposers.

Explanation:

Photosynthesis in a cactus plant occurs in the stem, not the leaves. This adaptation helps reduce water loss in arid environments. Animals like birds have light bones with air cavities to aid in flight and reduce weight. Biotic components of the environment include green plants, animals, and decomposers as they are living organisms that interact within ecosystems.

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