Kpk Biology 2010 — Solved MCQs

Question 1

The plants growing in soil containing large percentage of common salt are

Accepted Answer

C. Halophytes — Halophytes are defined as plants that naturally inhabit saline environments and benefit from having substantial amounts of salt in the growth media. Halophytes grow in a wide variety of saline habitats, from coastal regions, salt marshes and mudflats, to inland deserts, salt flats and steppes.

Question 2

Some animals walk on the tips of their foes. Which type of locomotion is this?

Accepted Answer

C. Digitigrade — In terrestrial vertebrates, digitigrade locomotion is walking or running on the toes. A digitigrade animal is one that stands or walks with its toes on the ground, and the rest of its foot lifted. Digitigrades include birds, cats, dogs, and many other mammals, but not plantigrades or unguligrades.

Question 3

Thick-walled and dead cells are found in plant tissue known as.

Accepted Answer

C. Sclerenchyma — Sclerenchyma tissue, when mature, is composed of dead cells that have heavily thickened walls containing lignin and a high cellulose content (60%–80%), and serves the function of providing structural support in plants.

Question 4

The surface of cartilage is covered by a peritoneum known as

Accepted Answer

C. Perichondrium — The perichondrium is a dense layer of fibrous connective tissue that covers the surface of most of the cartilage in the body.

Question 5

Glucagon of the pancreas is responsible for the conversion of

Accepted Answer

C. Glycogen — Glucagon's role in the body is to prevent blood glucose levels dropping too low. To do this, it acts on the liver in several ways: It stimulates the conversion of stored glycogen (stored in the liver) to glucose, which can be released into the bloodstream. This process is called glycogenolysis.

Question 6

Ovulation is controlled by the hormone called as hormone

Accepted Answer

B. Leutinizing — Leutinizing hormone (LH), the other reproductive pituitary hormone, aids in egg maturation and provides the hormonal trigger to cause ovulation and the release of eggs from the ovary.

Question 7

Organisms developed with two heads and one trunk, also known as ...... twins

Accepted Answer

C. Siamese — Until the late 1800s conjoined twins were called “monsters.” The term Siamese twins comes from the twin conjoined brothers Chang and Eng Bunker who were born in Siam, now Thailand. When they first arrived in England to become circus exhibits, they were called “The Siamese Twins.”In dicephalus conjoined twinning, it appears that two heads share a body; in cephalopagus, it appears that two bodies share a head. How many human animals are present in these cases? One answer is that there are two in both cases—conjoined twins are precisely that, conjoined twins.

Question 8

Which one of the following is the natural form of Auxin?

Accepted Answer

A. Indole acetic acid — Indole 3-Acetic acid (IAA) is the natural auxin mostly found in plants.

Question 9

Rh-antigen was first discovered In. ........

Accepted Answer

C. Rhesus monkey — The designation Rh is derived from the use of the blood of rhesus monkeys in the basic test for determining the presence of the Rh antigen in human blood. The Rh blood group system was discovered in 1940 by Karl Landsteiner and A.S. Weiner.

Question 10

Tumors are formed due to:

Accepted Answer

C. Mitosis — Recent work has provided insight into how mitotic errors shape cancer genomes by driving both numerical and structural alterations in chromosomes that contribute to tumor initiation and progression.

Question 11

Which one of the following Is not a producer of a pond ecosystem?

Accepted Answer

B. None of these — This is incorrect.

Question 12

Movements of plant's organs in response to touch or contact is called as _

Accepted Answer

B. Thigmotropism — In plant biology, thigmotropism is a directional growth movement which occurs as a mechanosensory response to a touch stimulus. Thigmotropism is typically found in twining plants and tendrils, however plant biologists have also found thigmotropic responses in flowering plants and fungi.

Question 13

Oxytocin is secreted by the endocrine gland named

Accepted Answer

C. Pituitary — Oxytocin is produced in the hypothalamus and is secreted into the bloodstream by the posterior pituitary gland.

Question 14

The persons with blood group “O" have _

Accepted Answer

D. Antibodies A&B — But if you have type O blood, your red blood cells have no A or B markers. So: Your body will have both A and B antibodies and will therefore feel the need to defend itself against A, B, and AB blood. A person with O blood can only get a transfusion with O blood.

Question 15

Producers, consumers and decomposers are together called_

Accepted Answer

A. Biotic components — An ecosystem is made up of three main components, the producers, the consumers and the decomposers.

Question 16

A specific locality with a particular set of environmental conditions where an organism lives is called as.

Accepted Answer

C. Habitat — A habitat is a place where an organism makes its home. A habitat meets all the environmental conditions an organism needs to survive.

Question 17

Dioxin is used as a _

Accepted Answer

A. Herbicide — Dioxins are mainly by-products of industrial processes but can also result from natural processes, such as volcanic eruptions and forest fires. They are unwanted by-products of many manufacturing processes including smelting, chlorine bleaching of paper pulp and the manufacture of some herbicides and pesticides.

Question 18

The tropical grasslands with drought-resistant woody trees constitute a _ ecosystem.

Accepted Answer

D. Grassland — Grassland present in temperate climates are also called Prairies, such as Prairies of North America, Pampas of Argentina. These grasslands do not have woody plants so they are known as Prairies. But the grassland in tropical climates have woody trees and are called Savanna.

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