A plant requires potassium for:

(1) Holding its cells together

(2) Synthesizing chlorophyll

(3) DNA replication

(4) Opening and closing its stomata

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The shoot apical meristem in a dicot embryo is located:

(1) Between the two cotyledons

(2) Within the root apex

(3) Around the suspensor

(4) In the endosperm

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Summer wood is:

(1) the same as heartwood.

(2) found to the outside of each annular ring of xylem.

(3) found to the inside of each annular ring of xylem.

(4) formed throughout the growing season.

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Read the different components from I to IV in the list given below and tell the correct order of the components with reference to their arrangement from outer side to inner side in a woody dicot stem

I. Secondary cortex

II. Wood

III. Secondary phloem

IV. Phellem

The correct order is

(1) III, IV, II, I

(2) I, II, IV, III

(3) IV, I, III, II

(4) IV, III, I, II

 

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Identify the wrong statement in context of heartwood.

(a) Organic compounds are deposited in it
(b) it is highly durable
(c) It conducts water and minerals efficiently
(d) It comprises dead elements with highly lignified walls

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Which of the following facilitates opening of stomatal aperture :-

(a) Contraction of outer wall of guard cells
(b) Decrease in turgidity of guard cells
(c) Radial orientation of cellulose microfibrils in the cell wall of guard cells
(d) Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Which of the following is made up of dead cells?

(a) Xylem parenchyma

(b) Collenchyma

(c) Phellem

(d) Phloem

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The vascular cambium normal gives rise to.
(a) phelloderm         (b) primary phloem
(c) secondary xylem (d) periderm

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


Cortex is the region found between

(a) Epidermis and stele

(b) Pericycle and endodermis

(c) Endodermis and pith

(d) Endodermis and vascular bundle

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level:


The balloon-shaped structures called tyloses

(a) Original in the lumen of vessels

(b) characterise the sapwood

(c) are exetentions of xylem parenchyma cells into vessels

(d) are linked to the ascent of sap through xylem vessels

To view Explanation, Please buy any of the course from below.
High Yielding Test Series + Question Bank - NEET 2020

Difficulty Level: