Home
Class 11
BIOLOGY
Read the following statements and select...

Read the following statements and select the correct ones.
(i). Phloem parenchyma is absent in most monocots.
(ii). Gymnosperms lack tracheids and vessel.
(iii). Gymnosperms lack companion cells.

A

a) (i) and (ii)

B

b) (ii) and (iii)

C

c) (i) and (iii)

D

d) (i), (ii) and (iii)

Text Solution

Verified by Experts

The correct Answer is:
C
Phloem parenchyma is absent in most of the monocots and some herbaceous dicots. Gymnosperms lack capanion cells, instead they possess albuminous cells. Gymnosperms lack vessel (except Gnetum etc.) but possess tracheids. Infact, tracheids constitute 90-95% fo wood in gymnosperms
Promotional Banner

Similar Questions

Explore conceptually related problems

Read the following statements and select the correct ones. (i) Electrophoresis is a technique used for the separation of molecules based on their size and charge. (ii) Plasmids are extra-chromosomal, self-replicating, usually circular, double stranded DNA molecules found naturally in many bacteria and also in some yeast,. (iii) It is not advisable to use an exonuclease enzyme while producing a recombinant DNA molecule. (iv) In EcoRl, the roman numberal I indicates that it was the first enzyme isolated from E.coli A) (i) and (ii) B) (iii) and (iv) C) (i),(ii) and (iv) D) (i),(ii),(iii) and (iv)

Read the following statements and select the correct ones. (i) A given species may occupy more than one trophic level in the same ecosystem at the same time. (ii) Productivity of an aquatic ecosystem is less than that of a terrestrial ecosystem. (iii) Producers constitute the first trophic level of a detritus food chain. A) i and ii B) ii and iii C) i and iii D) i, ii and iii

Read the following statements and select the correct ones. (i) Increase in mass and increase in number of individuals are twin characteristics of growth. (ii) Metabolic reactions can be demonstrated outside the body in isolated cell-free systems. (iii) 'Response to stimuli' is a defining property of living organisms.

Read the following statements and select the correct option. Statement 1: Locomotion is the movement of an indvidual from one place to another. Statement 2: All movents are locomotions are but all locomotions are not movements .

Read the following statements regarding spleen and select the correct option. (i) Spleen is a large oval-shaped organ which mainly contains lymphocytes and phagocytes. (ii) Spleen is a large reservoir of erythrocytes. (iii) Spleen is a primary lymphoid organ. (iv) spleen acts as a filter of the blood by trapping blood-borne microorganisms.

Read the following statements and select the correct answer. (i). Rhizobium leguminosarum is also known as Bacillus radicicola. (ii). Nitrifying bacteria (Nitrosomonas, etc.) are chemoautotrops. (iii). Enzyme nitrogenase fixes N_(2) under aerobic condition. (iv). Leghaemoglobin creates aerobic conditions for the enzyme nitrogenase.

Study carefully the following statements and select the incorrect one(s). (i). Lateralroots develop from pericycle. (ii) . Endodermis is the innermost layer of cortex (iii). Sapwood is the central, dark coloured, non-conducting part of secondary xylem.

Read the following statements and select the correct ones. (i) Same kind of sticky ends are produced when a DNA has been cut by different restriction enzymes. (ii) Exonucleases make cuts at specific positions within the DNA. (iii) Hind ll was the first restriction endonuclease to be isolated. (iv) A bacteriophage has the ability to replicate within bacterial cells by integrating its DNA with bacterial DNA. (v) Presence of more than one recognition sites for a enzyme within the vector facilitates the gene cloning.

Study the following statements and select the correct ones (i) Methanogens are archeabacteria which produce methane in marshy areas (ii) Nostoc is a filamentous blue green alga which fixes atmospheric nitrogen. (iii) Many members of the genus Glomus form mycorrhiza.

Read the following statements and select the incorrect ones. (i) When the transformed cells on agar plates containing ampicillin are spread, both transformed and untransformed cells will grow. (ii) Restriction enzymes are used in isolation and separation of DNA from other macromolecules. (iii) Downstream processing is one of the steps of rDNA technology. (iv) Disarmed pathogen vectors are also used in transfer of rDNA into the host. a) (i) and (iii) b) (iii) and (iv) c) (i) and (iii) d) (i) and (ii)