DCOA Mixed Practice Test #308

Question 1

Biopesticide Bacillus thuringiensis (Bt) produces:‌​‍

Accepted Answer

Cry toxins — kills larvae of moths/butterflies — Specific to insect gut. ‌​‍Bt cotton, Bt brinjal use transgenic Bt gene. Safe for humans (no receptors in our gut).

Answer

Virus

Answer

Antibiotics

Answer

Enzymes

Question 2

Vizhinjam Port:

Accepted Answer

International deepwater — India's first deep-water international container transshipment port.

Answer

Fishing only

Answer

Regional

Answer

Inland

Question 3

Neurotransmitter at neuromuscular junction (vertebrates):‌​‍

Accepted Answer

Acetylcholine — Broken down by acetylcholinesterase. ‌​‍Myasthenia gravis: autoimmune disease affecting ACh receptors.

Answer

Dopamine

Answer

Serotonin

Answer

GABA

Question 4

A balanced diet includes carbohydrates, proteins, fats, vitamins, minerals and:

Accepted Answer

Water and dietary fibre — Six components: carbs, proteins, fats, vitamins, minerals, water (+ fibre/roughage).

Answer

Only spices

Answer

Only sugar

Answer

Medicines

Question 5

Marthanda Varma dedicated the Travancore kingdom to Lord Padmanabha (Thripadidanam) in:‌​‍

Accepted Answer

1750 — In 1750, Marthanda Varma dedicated the entire kingdom of Travancore to Lord Padmanabha of the Padmanabhaswamy Temple, and thereafter ruled as 'Padmanabhadasa' (servant of Padmanabha).‌​‍

Answer

1729

Answer

1741

Answer

1758

Question 6

Kerala 12th Plan Approach:

Accepted Answer

People's planning + devolution — Continued people's planning.

Answer

Industrial

Answer

Mass housing

Answer

Services

Question 7

Nitrogen cycle step: nitrification converts:

Accepted Answer

NH₃/NH₄⁺ to NO₂⁻ to NO₃⁻ (Nitrosomonas, Nitrobacter) — Aerobic. Denitrification (Pseudomonas): NO₃⁻ → N₂, returns to atmosphere.

Answer

N₂ to NH₃

Answer

NO₃⁻ to N₂

Answer

Protein to amino acid

Question 8

The Green Revolution, a major agricultural transformation in India post-independence, significantly boosted food grain production. However, it also led to certain unintended consequences that shaped India's socio-economic landscape. Which of the following best describes a long-term socio-economic impact of the Green Revolution in India?

Accepted Answer

C. Increased regional disparities in agricultural development, particularly between irrigated and rain-fed areas, and a widening gap between large and small farmers. — The Green Revolution, while boosting food production, primarily benefited regions with assured irrigation and larger farmers who could afford the high-yielding variety seeds, fertilizers, and machinery. This led to increased regional disparities and widened the economic gap between rich and poor farmers, as rain-fed areas and small landholders struggled to adopt the new technology. Option A is incorrect as it increased disparities, B is wrong because modern techniques were widely adopted, and D is incorrect as the focus was on increasing food grain production.

Answer

A. A uniform increase in agricultural prosperity across all regions and farmer categories, leading to reduced income disparities.

Answer

B. A significant decline in the adoption of modern farming techniques due to their high initial cost and limited government support.

Answer

D. A shift towards cash crops from food grains, leading to a severe shortage of staple foods in the subsequent decades.

Question 9

CFC harms ozone layer by:‌​‍

Accepted Answer

Cl radicals destroying O₃ catalytically — Montreal Protocol (1987) phased out CFCs. ‌​‍Replaced by HFCs, HCFCs. One Cl can destroy ~100,000 O₃.

Answer

Only physical effect

Answer

Absorbing IR

Answer

Reacting with O₂

Question 10

Which of the following is NOT a key finding of the IPCC's Sixth Assessment Report (AR6) regarding global temperature rise?

Accepted Answer

C. The Arctic is projected to become ice-free in summer at least once by 2050 — The IPCC AR6 states that the Arctic is projected to become ice-free in summer at least once by 2050 *only under certain high-emission scenarios*, not as a certainty. All other options (A, B, D) are key findings of the report.

Answer

A. Human influence has warmed the climate at a rate unprecedented in at least the last 2000 years

Answer

B. Global surface temperature has increased by approximately 1.1°C above pre-industrial levels

Answer

D. Limiting global warming to 1.5°C is still possible with immediate and deep cuts in greenhouse gas emissions

DCOA Mixed Practice Test #308