MCQ
In flowering plants, the main water transporting elements are
  • A
    Tracheids
  • B
    Vessels
  • C
    Fibres
  • Both ($a$) and ($b$)

Answer

Correct option: D.
Both ($a$) and ($b$)
d
Tracheids are elongated or tube like cells with thick and lignified walls and tapering ends. These are dead and are without protoplasm. The inner layers of the cell walls have thickenings which vary in form. In flowering plants, tracheids and vessels are the main water transporting elements

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

How many glucose molecules are required for the formation of $52$ pyruvic acid molecules at the end of glycolysis ?
Pila globosa (apple snail):
i. Is adapted to lead an amphibious life.
ii. Is both ureotelic and ammonotelic.
iii. Is both ammonotelic as well as uricotelic.
iv. Is both ureotelic and uricotelic.
Sarcomere is a filament found in :
Identify the wrong statements about human excretory system and choose the option accordingly

$I.$ Kidneys are reddish brown and bean-shaped structure

$II.$ Kidneys are situated between the last thoracic and third lumber vertebra

$III.$ Each kidney of an adult human measures $10-12\, cm$ in length, $5-7\, cm$ in width, $2-3 \,cm$ thickness, and average weight $120-170$ $gram$

$A$ : Seeds do not sprout when $ABA$ is overcome by Gibberellins.
$R$ : $GA$ inhibits protein and $RNA$ synthesis.
Given below is an incomplete table on hormones, their source glands and one major effect of each human body. Identify the option representing correct grouping of hormone its gland and effect.

Gland Secretion Effect on body
$A$ Estrogen Maintenance of secondary sexual characters
Alpha cells of Islets of Langerhans $B$ Raises blood sugar level
Anterior pituitary  $C$ Over secretion leads to gigantism

 

Name the blood cells, whose reduction in number can cause clotting disorder, leading to excessive loss of blood from the body
Study the following statements :
$(a)$ The substrate binds to the active site of the enzyme
$(b)$ Enzymes isolated from thermophilic organisms get denatured at $50°C$
$(c)$ The active site of enzyme breaks the chemical bonds of the product
$(d)$ Prosthetic groups are tightly bound to the apoenzyme
Select the option which includes all correct statements :
Commercially important fibres of cotton are
Apical dominance is caused by