IGCSE Biology Paper-1: Specimen Questions with Answers 79 - 81 of 208

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Question 79

Question

MCQ▾

In which part of plant cell cellulose occur abundantly.

Choices

Choice (4)

a.

Chloroplast

b.

Ribosome

c.

Cell membrane

d.

Cell wall

Answer

d.

Explanation

The cell wall is a protective layer outside the cell membrane that also provides support for the cell՚s structure. The most characteristic compound found in all plant cell walls is cellulose. It consists of a collection of β-1,4-linked glucan chains.

Question 80

Question

MCQ▾

Which statement is not correct for exoskeleton?

Choices

Choice (4)

a.

Develops from ectoderm

b.

Hard part that lies outside of the body

c.

Mostly non-living e. g. scales, hair

d.

Develops from endoderm

Answer

d.

Explanation

Exoskeletons occur outside of an animal. This skeleton work as a hard outer coating that s protect the animal from predators and the environment. This outer coating is made up of chitin. The exoskeleton covers the muscles and soft tissue for muscular movement. As the animal increases in size, however, the exoskeleton becomes too heavy and restricts growth. Endoskeletons exist on the inside of an animal and develops from endoderm.

Question 81

Question

MCQ▾

The structure, which is present only in plant cells

Choices

Choice (4)

a.

Nucleus and cell membrane

b.

Cell wall and cytoplasm

c.

Cell membrane and cytoplasm

d.

Cell wall and chloroplast

Answer

d.

Explanation

The cell is the structural and functional unit of the body. Plant cells may differ from other cells in different aspects like chloroplast and a cell wall is present in plant cells. A cell wall made up of cellulose and hemicellulose, and pectin is secreted by the protoplast on the outside of the cell membrane and chloroplast contains chlorophyll, which absorbs sunlight for photosynthesis process.

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