Punjab Biology 2017 Paper 2 — Solved MCQs

Question 1

The incidence of Calcium Phosphate stones in humans are

Accepted Answer

C. 15% — The incidence of calcium phosphate stones in humans is 15%.The salts are precipitated out during urine formation and accumulate later to form stone.

Question 2

The lower two pairs of ribs in humans are called

Accepted Answer

C. floating ribs — The lower two pairs of ribs in humans are called "floating ribs." These ribs do not connect directly to the sternum (breastbone) or to other ribs but are attached to the vertebral column in the back. They are also known as "vertebral ribs" or "false ribs."

Question 3

The thalamus carries sensory information to the limbic system and

Accepted Answer

B. cerebrum — Thalamus carries sensory information to the limbic system and cerebrum. The information includes sensory input from auditory and visual pathways, from the skin and from within the body.

Question 4

The day neutral plant is

Accepted Answer

D. cotton — Cotton bloom irrespective of day length. When cotton reach a specific developmental stage, the plants begin to flower. It is not photoperiodism that causes the flowering in these plants.

Question 5

The neurula is the stage in which embryo has

Accepted Answer

C. neural tube — The neurula stage is a developmental stage in embryonic development during which the embryo forms the neural tube, which will eventually develop into the brain and spinal cord. At this stage, the embryo is characterized by the presence of the neural plate, which folds and fuses to form the neural tube.

Question 6

If the alterations involve only one or a few base pairs in the coding sequence they are called

Accepted Answer

B. point mutation — If alterations involve only one or a few base pairs in the coding sequence, they are typically referred to as "point mutations." These mutations involve a change in a single nucleotide base pair within the DNA sequence. Point mutations can have various effects on the resulting protein, ranging from no change to a minor alteration in the amino acid sequence to a significant change that affects protein function.

Question 7

The period of life cycle of a cell between two consecutive divisions is

Accepted Answer

D. interphase — The period of the cell cycle between two consecutive divisions is known as interphase. Interphase is the longest phase of the cell cycle and is divided into three sub phases. During interphase, the cell grows, replicates its DNA, and prepares for cell division. After interphase, the cell enters the mitotic phase.

Question 8

During meiosis, the tetrad is formed in

Accepted Answer

B. zygotene — Tetrad formation occurs during the zygotene stage of prophase I in meiosis. In zygotene, homologous chromosomes pair up to form structures known as bivalents or tetrads. Each tetrad consists of two homologous chromosomes, with each chromosome composed of two sister chromatids.

Question 9

The maturity on-set diabetes of the young(MODY) is

Accepted Answer

A. an autosomal dominant trait — Maturity-onset diabetes of the young (MODY) is a group of monogenic forms of diabetes characterized by autosomal dominant inheritance and typically presents before the age of 25. About 50% of cases of MODY are caused by mutations in glucokinase gene.

Question 10

The cell suspension cultures of Cinchona ledgeriana produce

Accepted Answer

C. quinine — The cell suspension cultures of Cinchona ledgeriana, a plant known for its production of quinine, can produce various alkaloids, including quinine. Quinine is a natural compound with antimalarial properties, and it's synthesized within the plant's cells as a defense mechanism against pathogens.

Question 11

The gene pool consists of all alleles at all gene loci in all individuals of

Accepted Answer

C. population — The gene pool consists of all alleles at all gene loci in all individuals of a population. It represents the total genetic diversity within a population or species. This includes all the different versions (alleles) of genes present for each trait within the population.

Question 12

In each case succession begins by a few hardy invaders called

Accepted Answer

D. pioneers — In ecological succession, pioneers are the first organisms to colonize a barren or disturbed habitat. These organisms are typically hardy and able to thrive in harsh conditions. As pioneers establish themselves, they pave the way for more complex and diverse species to inhabit the area over time.

Question 13

The average rainfall in temperate deciduous forest is

Accepted Answer

A. 750--1500mm — Average rainfall in temperate deciduous forests typically ranges from about 750 to 1500 millimeters annually. This rainfall is relatively evenly distributed throughout the year, with no distinct dry season.

Question 14

The study of human populations and things that affect them is called

Accepted Answer

D. dermography — The study of human populations is called demography. Demography involves the analysis of population size, structure, distribution, and dynamics, including factors such as birth rates, death rates, migration patterns, age distribution, fertility rates, and mortality rates.

Question 15

The homeostatic thermostat present in a brain part is called

Accepted Answer

B. hypothalamus — The homeostatic thermostat present in a part of the brain is commonly referred to as the hypothalamus. The hypothalamus plays a crucial role in regulating various bodily functions, including temperature control, by receiving input from temperature receptors in the body and initiating responses to maintain internal stability or homeostasis.

Question 16

The inflammatory or degenerative disease that damages joints is called

Accepted Answer

A. arthritis — The inflammatory or degenerative disease that damages joints is commonly referred to as arthritis. There are several types of arthritis, including osteoarthritis, rheumatoid arthritis, and psoriatic arthritis, among others. These conditions can cause pain, stiffness, swelling, and reduced range of motion in affected joints, and they can have a significant impact on a person's quality of life.

Question 17

The leaf unrolling is promoted by red light in

Accepted Answer

D. monocots — Leaf unrolling is a process primarily observed in monocots, which are a type of flowering plant characterized by having seeds with a single cotyledon or seed leaf. Monocots include grasses, lilies, and palms.

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