VFA Mixed Practice Test #632

Question 1

What is the basic structure of immunoglobulins (antibodies)?‌​‍

Accepted Answer

4 chains (2 heavy + 2 light) in Y-shape — 5 classes: IgG (most abundant), IgA (secretions), IgM (first response), IgE (allergy), IgD. ‌​‍Antigen-binding site at tips of Y.

Answer

One chain

Answer

No structure

Answer

2 chains

Question 2

A teacher observes students conducting an experiment to investigate the properties of different liquids. They are collecting data, making observations, and formulating initial hypotheses without direct instruction on the concepts. Which phase of the 5E model are the students currently in, and what is its primary purpose?

Accepted Answer

C. Explore; to allow students to investigate phenomena and build experiences. — The Explore phase is characterized by students' hands-on investigation of a phenomenon, allowing them to gather data and build experiences before formal concepts are introduced. Elaborate extends learning, Explain introduces concepts, and Engage hooks interest and accesses prior knowledge.

Answer

A. Elaborate; to extend understanding to new contexts.

Answer

B. Explain; to introduce formal concepts and definitions.

Answer

D. Engage; to activate prior knowledge and create interest.

Question 3

Blood: A is son of B, B is daughter of C. C to A:

Accepted Answer

Grandmother — C female → grandmother.

Answer

Father

Answer

Grandfather

Answer

Uncle

Question 4

UNESCO World Heritage Natural site in India:

Accepted Answer

Kaziranga NP, Manas, Nanda Devi, Sundarbans, Western Ghats, Great Himalayan NP, Khangchendzonga — Taj is cultural site. India has 40+ WHS (cultural + natural + mixed).

Answer

Taj Mahal

Answer

Red Fort

Answer

Only monuments

Question 5

The number of pairs of cranial nerves is:‌​‍

Accepted Answer

12 — There are 12 pairs of cranial nerves. There are 31 pairs of spinal nerves.‌​‍

Answer

10

Answer

24

Answer

31

Question 6

Artificial ripening of fruits is accomplished by treatment with:

Accepted Answer

Ethylene gas — Ethylene is the natural ripening hormone; artificially used (calcium carbide releases acetylene that mimics ethylene).

Answer

Sodium chloride

Answer

Indole-3 acetic acid

Answer

Kinetin

Question 7

Mycoplasma are unique because they:‌​‍

Accepted Answer

Lack cell wall — Smallest free-living organisms. ‌​‍Pleomorphic (variable shape). Resistant to penicillin (which inhibits cell wall synthesis).

Answer

Have large size

Answer

Photosynthesise

Answer

Have nucleus

Question 8

High-density lipoprotein (HDL) is often referred to as 'good cholesterol' because it plays a crucial role in:

Accepted Answer

C. Removing excess cholesterol from peripheral tissues and transporting it back to the liver. — HDL is known as 'good cholesterol' because it mediates reverse cholesterol transport, a process where it collects excess cholesterol from peripheral cells and arterial walls and transports it back to the liver for excretion or reprocessing. This action helps to prevent the buildup of plaque in arteries, reducing the risk of atherosclerosis.

Answer

A. Transporting triglycerides from the liver to adipose tissue.

Answer

B. Depositing cholesterol in arterial walls, leading to atherosclerosis.

Answer

D. Synthesizing new cholesterol molecules in the liver.

Question 9

Under the 'Snehasparsham' scheme, which of the following services is provided to children with disabilities?

Accepted Answer

C. Home-based rehabilitation and early intervention — The 'Snehasparsham' scheme primarily provides home-based rehabilitation and early intervention services for children with disabilities, including physiotherapy, speech therapy, and occupational therapy. While assistive devices and financial support may be part of broader schemes, they are not the core components of 'Snehasparsham'.

Answer

A. Free wheelchairs and assistive devices

Answer

B. Monthly financial support for education

Answer

D. Free transport to special schools outside the district

Question 10

The universal recipient blood group is:

Accepted Answer

AB+ — AB+ has no anti-A, anti-B, or anti-Rh antibodies → can receive any group.

Answer

O−

Answer

O+

Answer

A+

VFA Mixed Practice Test #632