HSA Mixed Practice Test #328

Question 1

Fertilisation in angiosperms: primary endosperm nucleus (PEN) is:‌​‍

Accepted Answer

Triploid (3n) — fuses 2 polar + 1 sperm — Other sperm + egg → zygote (2n). ‌​‍Endosperm nourishes embryo. Unique double fertilization.

Answer

Tetraploid

Answer

Haploid

Answer

Diploid

Question 2

What is the primary mechanism of action of statins (HMG-CoA reductase inhibitors) in lowering cholesterol?

Accepted Answer

C. Reducing cholesterol synthesis in the liver by inhibiting a key enzyme. — Statins work by competitively inhibiting HMG-CoA reductase, a crucial enzyme in the mevalonate pathway responsible for endogenous cholesterol synthesis in the liver. This reduction in hepatic cholesterol synthesis leads to an upregulation of LDL receptors on hepatocytes, increasing the clearance of LDL from the blood. Other options describe mechanisms of different lipid-lowering drugs.

Answer

A. Increasing the excretion of bile acids.

Answer

B. Inhibiting the absorption of dietary cholesterol from the intestine.

Answer

D. Enhancing the activity of lipoprotein lipase.

Question 3

The hormone-mimicking endocrine disruptor in some plastics is:‌​‍

Accepted Answer

Bisphenol A (BPA) — BPA, used in polycarbonate plastics and epoxy resins, mimics estrogen — banned in many products.‌​‍

Answer

Vitamin C

Answer

Caffeine

Answer

Glucose

Question 4

Who designed the telescope that confirmed Jupiter's moons and Saturn's rings?

Accepted Answer

Galileo Galilei — Galileo's refracting telescope (1609) revolutionised observational astronomy.

Answer

Copernicus

Answer

Newton

Answer

Kepler

Question 5

Shivaji's famous Ashta Pradhan council consisted of:‌​‍

Accepted Answer

8 ministers (Peshwa, Amatya, Sachiv, Mantri, Senapati, Sumant, Nyayadhish, Panditrao) — Ashta Pradhan = Eight Ministers council. ‌​‍Each with specific portfolio — civil, military, religious, judicial.

Answer

5

Answer

12

Answer

10

Question 6

The 'No Detention Policy' under the RTE Act, 2009, as implemented in Kerala, applies to students up to which class before they face any form of academic assessment or grade retention?

Accepted Answer

B. Class 8 — Kerala follows the 'No Detention Policy' up to Class 8, meaning students cannot be held back or failed until they complete Class 8 under the RTE Act. This policy aims to reduce stress and dropout rates. After Class 8, schools may conduct assessments, and students may face grade retention if necessary. Options Class 5 and Class 3 are incorrect as they are below the RTE mandate, while Class 10 is beyond the policy's scope.

Answer

A. Class 5

Answer

C. Class 10

Answer

D. Class 3

Question 7

Polaroid absorbs:

Accepted Answer

Light polarised perpendicular to transmission axis — Malus's law: I = I₀ cos²θ. Natural light is unpolarised; Polaroid makes it 50% intensity, linearly polarised.

Answer

All light

Answer

Only red

Answer

Only UV

Question 8

Symbol of Iron:

Accepted Answer

Fe — Fe (Ferrum).

Answer

Ir

Answer

In

Answer

I

Question 9

Wetlands in India Ramsar:

Accepted Answer

75+ — Over 75 Ramsar sites.

Answer

26

Answer

46

Answer

100

Question 10

Correct: 'Each of the boys were given a pen.'

Accepted Answer

Each of the boys was given a pen. — 'Each' is singular → 'was given'.

Answer

Each of the boys are given a pen.

Answer

Each of the boys give a pen.

Answer

Each of the boys were given pens.

HSA Mixed Practice Test #328