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NEET NEET Questions — Free MCQ Practice

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What is the normal appereance of stone cells ?

A. Hexagonal B. Round C. Isodiamatric D. Oval

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Root has always

A. Endarch xylem B. Tetrach stele C. Exarch xylem D. Palyarch stele.

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Explanation

In roots, the xylem is typically exarch, which means the protoxylem is located at the periphery and the metaxylem is towards the center. This is a characteristic arrangement in roots, facilitating the efficient transport of water and nutrients from the soil.

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Match coloumn I and coloumn II Organs (p) Maize stem (q) Cucurbita stem (r) Sunflower stem (s) Maize root vascular bundle (1)Bicollateral and open (2)Radidal (3)Conjoint and closed (4)Conjoint and open

A. (p-1) (q-4) (r-3) (s-2) B. (p-2) (q-3) (r-1) (s-4) C. (p-3) (q-1) (r-4) (s-2) D. (p-3) (q-4) (r-2) (s-1)

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Explanation

To match the organs with their correct types of vascular bundles, we need to understand the structure of the vascular bundles in these plants:

Maize stem has a conjoint and closed vascular bundle.
Cucurbita stem has a bicollateral and open vascular bundle.
Sunflower stem has a conjoint and open vascular bundle.
Maize root has a radial vascular bundle.

Therefore, the correct match is (p-3) (q-1) (r-4) (s-2).

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Phellodermis formed of

A. Phellem+ phellogen B. Periderm + phellogen C. Phellem + periderm D. Periderm-phellogen and phellem

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Which one of the following is an internal secretory structure ?

A. Passage cell B. Lysigeneous cavity C. Resin duct D. Stone cell

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Match column I with column II Tissue (1) PArenchyma (2) Lateralmeristem (3) Apicalmeristem (4) Intercalarymeristem Function (a) Increase in length of plants (b) Increase in nodal region (c) support,protection,storage (d) Increase in diametre of trunk

A. (1-d) (2-c) (3-b) (4-a) B. (1-c) (2-d) (3-a) (4-b) C. (1-a) (2-b) (3-d) (4-c) D. (1-c) (2-a) (3-d) (4-b)

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Explanation

The correct matching of tissue types with their functions is:

Parenchyma (c) support, protection, storage
Lateral meristem (d) Increase in diameter of trunk
Apical meristem (a) Increase in length of plants
Intercalary meristem (b) Increase in nodal region. Parenchyma cells are involved in storage and support, lateral meristem is responsible for the secondary growth (increase in diameter), apical meristem is involved in primary growth (increase in length), and intercalary meristem helps in the elongation of internodes.

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in eukaryotes tail in m-rna is formed by

A.

.....GCGCGCGCGC......CAATCAATCAAT......

B.

.......AAAAAAAAAAAAAAAAAA....

C.

..........GCGCGCGCGCGC........

D.

......GGGGGGGGGGGGGGG....

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Explanation

tailing is also called polyadenylation ie adding of a "poly A TAIL "

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Which tissue is always present in the ground tissue of root and stem of all plants

A. Collenchyma B. Sclerenchyma C. Chlorenchyma D. Parenchyma

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Explanation

Parenchyma is always present in the ground tissue of the roots and stems of all plants. It is the most common and versatile ground tissue and plays a role in storage, photosynthesis, and tissue repair.

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Bulliform cells are present in

A. Bundle sheath B. Mesophyll tissue C. Vascular Bandle D. Epidermis

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Explanation

Bulliform cells are large, bubble-shaped epidermal cells that occur in groups on the upper surface of the leaves of many monocots, such as grasses. These cells help in the folding and unfolding of leaves by changing their turgor pressure.

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The vascular cambium and cork cambium are the examples of

A.

Apical meristem

B.

Lateral Meristem

C.

Intercalary meristem

D.

Permanent tissue

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Explanation

The vascular cambium and cork cambium are examples of lateral meristems. Lateral meristems are responsible for the secondary growth in plants, which increases the thickness of stems and roots. Unlike apical meristems which are found at the tips of roots and shoots, lateral meristems contribute to the growth in girth.

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