21.

Match the items given in Column I with those in Column II and select the correct option given below:

Column I		Column II
Function		Part of the Excretory system
a	Ultrafiltration	i	Henle's loop
b	Concentration of urine	ii	Ureter
c	Transport of urine	iii	Urinary bladder
d	Storage of urine	iv	Malpighian corpuscle
		v	Proximal convoluted tubule

• a	b	c	d
  iv	v	ii	iii

• a	b	c	d
  iv	i	ii	iii

• a	b	c	d
  v	iv	i	iii

• a	b	c	d
  v	iv	i	ii

Match the items given in Column I with those in Column II and select the correct option given below

• a	b	c	d
  iii	ii	iv	i

• a	b	c	d
  i	ii	iii	iv

• a	b	c	d
  iv	i	ii	iii

• a	b	c	d
  ii	iii	i	iv

What is the role of NAD⁺ in cellular respiration?

• It functions as an enzyme.

• It functions as an electron carrier.

• It is the final electron acceptor for anaerobic respiration.

• It is a nucleotide source for ATP synthesis.

Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?

• Hydrilla

• Yucca

• Viola

• Banana

Oxygen is not produced during photosynthesis by

• Green sulphur bacteria

• Nostoc

• Chara

• Cycas

In which of the following forms is iron absorbed by plants?

• Ferric

• Ferrous

• Both ferric and ferrous

• Free element

Which of the following elements is responsible for maintaining turgor in cells?

• Magnesium

• Sodium

• Calcium

• Potassium

Which of the following is not a product of light reaction of photosynthesis?

• ATP

• NADH

• Oxygen

• NADPH

Stomatal movement is not affected by

• Temperature

• Light

• CO₂ concentration

• O₂ concentration

The Golgi complex participates in

• Fatty acid breakdown

• Formation of secretory vesicles

• Activation of amino acid

• Respiration in bacteria