Which one of the following pairs of structures is correctly matched with their correct description?

• Structure	Description
  Tibia and fibula	Both form parts of knee joint

• Structure	Description
  Cartilage and cornea	No blood supply but do require oxygen for respiratory

• Structure	Description
  Shoulder joint and elbow joint	Ball and socket type of joint

• Structure	Description
  Shoulder joint and elbow joint	Ball and socket type of joint

Leguminous plants are able to fix atmospheric nitrogen through the process of symbiotic nitrogen fixation. Which one of the following statement is not correct during the process of nitrogen fixation?

• Leghaemoglobin scavenges oxygen and is pinkish in colour

• Nodules act as a site for nitrogen fixation

• The enzyme nitrogenase catalyse the conversion of atmospheric N₂ to NH₃

• The enzyme nitrogenase catalyse the conversion of atmospheric N₂ to NH₃

3.

Which one of the following is a xerophytic plant in which the stem is modified into the flag green and succulent structure? 

• Opunita

• Casuarina

• Hydrilla

• Hydrilla

In which one of the following organism, its excretory organs are correctly stated?

• Humans- Kidneys, sebaceous glands and tear glands

• Earthworm -Pharyngeal, integumentary and septal nephridia

• Cockroach - Malpighian tubules and enteric caeca

• Cockroach - Malpighian tubules and enteric caeca

If for some reason the parietal cells of the gut epithelium become partially non-functional, what is likely to happen?

• The pancreatic enzymes and specially the trypsin and lipase will not work efficiently

• The pH of stomach will fall abruptly

• Steapsin will be more effective

• Steapsin will be more effective

Read the following four statements, A, B,C and D select the right option having both correct statements.

A) Z scheme of light reaction takes place in presence of PS- I only.

B) Only PS-I is functional in cyclic photophosphorylation.

C) Cyclic photophosphorylation results into synthesis of ATP and NADPH₂

D) Stroma lamellae lack PS-II as well as NADP.

• B and D

• A and B

• B and C

• B and C

Given below are four statements (A-D) regarding human blood circulatory system

• Arteries are thick -walled and have narrow lumen as compared to veins

• Angina is acute chest pain when the blood circulation to the brain reduced.

• Persons with blood group-AB can donate blood to any person with any blood group under ABO system

• Persons with blood group-AB can donate blood to any person with any blood group under ABO system

The haemoglobin content per 100 mL of blood of a normal healthy human adult is 

• 5-11 g

• 25-30 g

• 17-20 g

• 17-20 g

An example of endomycorrhiza is 

• Nostoc

• Glomus

• Agaricus

• Agaricus

One of the commonly used plant growth hormone in tea plantations is 

• ethylene

• abscisic acid

• Zeatin

• Zeatin