National Science Olympiad Model Paper 3 Questions and Answers Part 30

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33. Identify the figure show below from the statement

Cells Are Found Every Soft Part of Plant

Cells are found in every soft part of the plant,

It has a thin cell wall of their cells, and are made up of cellulose

The function of this cells is in the storage of foods, in gaseous exchange, and in photosynthesis

A) Collenchyma

B) Sclerenchyma

C) Parenchyma

D) None of the above

Answer: C

Explanation:

Parenchyma cells are found in every soft part of the plant, but collenchyma cells are found in specific part of the plant like leaves, stems, and petioles, whereas sclerenchyma cells are found in mature parts of the plants or trees.

Different types of shapes of all the cells, but parenchyma cells are iso-diametric, while Collenchyma elongated and Sclerenchyma are sclereids, fiber in their shapes, respectively.

Parenchyma has a thin cell wall of their cells and are made up of cellulose. Whereas collenchyma cells have an uneven cell wall made up of pectin and hemicellulose. There is a hard and thick cell wall present of the sclerenchyma cells, which is made up of the lignin.

Intercellular space between the cells is present in parenchyma cells, while in Collenchyma cells less space is present between the cells and in Sclerenchyma cells, intercellular space is absent due to which cells are tightly packed.

The function of parenchyma cells is in the storage of foods, in gaseous exchange, and in photosynthesis, while Collenchyma cells provide mechanical support and elasticity to the plant, the Sclerenchyma cells provide mechanical support to the plant.

34. Refer the chart below answer the question

Identify the wrong one

1. P has Radial symmetry having tissue system

2. Q has bilateral symmetry with the false coelom

3. R has true coelom

4. S doesn՚t have a body cavity

Choose the Correct Option

A) P could be cnidaria

B) Q is Aschelminthes

C) R is Ctenophora

D) S is Platyhelminthes

Answer. C

Explanation:

Refer the Chart

35. Sycon belongs to a group of animals which are best described as

A) Multicellular with a gastrovascular system

B) Multicellular having tissue organisation, but no body cavity

C) Unicellular or acellular

D) Multicellular without any tissue organisation

Answer:

Explanation:

Sycon belongs to phylum Porifera.

Members of this phylum are commonly known as sponges.

They are generally marine and mostly asymmetrical animals.

These are primitive multicellular animals and have a cellular level of organisation.

Sycon Belongs to a Group of Animals

36. Which of the following phylum are included in Enterozoa

A) Echinodermata, Hemichordate, Porifera

B) Annelida, Mollusca, Porifera

C) Porifera, Mollusca, Arthropoda

D) Mollusca, Arthropoda, Hemichordate

Answer: D

Explanation:

Enterozoa is a group which includes animals with a digestive tract or cavity.

These include molluscs, arthropods and hemichordates.

Annelids are Protostomia in which blastopore forms mouth, schizocoelom is present.

Porifera are included in Parazoa where simple animals without a digestive cavity is included.

Echinodermata are included in Bilateria having bilateral symmetry with CNS.

Thus, the correct answer is option (C) .

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