Punjab Biology 2015 Paper 2 — Solved MCQs

Question 1

A pair of kidneys consisting of millions of functional units are called

Accepted Answer

A. Nephrons — The functional unit of the kidneys is the nephron. Each human kidney contains approximately 1.2 million nephrons, which are hollow tubes composed of a single cell layer. The nephron consists of a renal corpuscle, proximal tubule, loop of Henle, distal tubule, and collecting duct system

Question 2

The excretory product that requires maximum water for its elimination as compared to others is

Accepted Answer

A. Ammonia — About 500 ml water is needed to excrete lg of ammonia nitrogen.

Question 3

Euglena moves with the help of

Accepted Answer

B. Flagellum — Flagellum is primarily a motility organelle that enables movement and chemotaxis. Bacteria can have one flagellum or several, and they can be either polar (one or several flagella at one spot) or peritrichous (several flagella all over the bacterium).

Question 4

The disease caused by low calcium in the blood is

Accepted Answer

B. Tetany — Tetany is a symptom that involves involuntary muscle contractions and overly stimulated peripheral nerves. It's caused by electrolyte imbalances — most often low blood calcium levels. It's important to talk to your healthcare provider if you're experiencing tetany. Severe cases require immediate medical treatment.

Question 5

Abscisic acid can be sprayed on tree crops to regulate

Accepted Answer

C. Fruit drop — Abscisic acid can be sprayed on tree crops to regulate fruit drop at the end of the season. This removes the need for picking over a large time span

Question 6

Nociceptors produce the sensation of

Accepted Answer

D. Pressure — The relatively unspecialized nerve cell endings that initiate the sensation of pain are called nociceptors

Question 7

A type of asexual reproduction in which parent organisms simply divide into two daughter organisms is

Accepted Answer

C. Binary fission — Binary fission occurs when a parent cell splits into two identical daughter cells of the same size. Fragmentation occurs when a parent organism breaks into fragments, or pieces, and each fragment develops into a new organism.

Question 8

Mammals are

Accepted Answer

C. Viviparous — The oviparous animals reproduce by laying eggs and viviparous animals reproduce by giving birth to young ones. Some animals are ovoviviparous i.e. they lay eggs but the egg is developed inside the mother's body. Platypus is the only mammal to reproduce oviparously.

Question 9

The cavity formed between somatic and splanchnic mesoderm is

Accepted Answer

D. Coelom — A coelom is a hollow, fluid-filled cavity found in many living things, where it acts as a protective cushion for their internal organs. In some animals, such as worms, the coelom acts as a skeleton. The coelom also allows the internal organs to move and grow independently of the outer layer of the body wall.

Question 10

RNA polymerase I synthesizes

Accepted Answer

A. rRNA — The task of transcribing nuclear genes is shared between three RNA polymerases in eukaryotes: RNA polymerase (pol) I synthesises the large rRNA, pol II synthesises mRNA and pol III synthesises tRNA and 5S rRNA.

Question 11

Karyokinesis involves the division of

Accepted Answer

D. Nucleus — Karyokinesis is defined as the division of the nucleus during the M phase of the cell cycle. It is the first step in M phase. This process does not depend on cytokinesis. It divides the genetic material equally.

Question 12

A woman can be bald only when she is

Accepted Answer

C. Homozygous recessive — A heterozygous male is bald but a heterozygous female is not. A woman can be bald only when she is homozygous recessive.

Question 13

One common type of vector is a

Accepted Answer

D. Plasmid — The four major types of vectors are plasmids, viral vectors, cosmids, and artificial chromosomes. Of these, the most commonly used vectors are plasmids.

Question 14

A respiratory protein found in all aerobic species is

Accepted Answer

C. Cytochrome c — Cytochrome c oxidase in animals, plants and many aerobic bacteria functions as the terminal enzyme of the respiratory chain where it reduces molecular oxygen to form water in a reaction coupled to energy conservation.

Question 15

The relationship between insects and flowering plants is the example of

Accepted Answer

B. Mutualism — Some relationships, called mutualism, have worked out to benefit both of the organisms involved. This is especially true of the relationship plants share with insects. There are three basic types of plant-insect mutualistic relationships: protection, pollination and seed dispersal.

Question 16

In Sindh, the desert ecosystem is called

Accepted Answer

A. Thar — The desert is variously known as the Cholistan or Rohi Desert in Bahawalpur and the Pat or Thar Desert in Sindh. The surface of the desert is a wild maze of sand dunes and sand ridges.

Question 17

The natural heat energy trapped underground is called

Accepted Answer

D. Geothermal energy — Geothermal energy is the heat produced deep in the Earth's core. Geothermal energy is a clean, renewable resource that can be harnessed for use as heat and electricity.

Punjab Biology 2015 Paper 2 — Solved Past Paper with Answers

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