Question 1

Lacrymal glands are situated in the

Accepted Answer

Buccal cavity

Question 2

Companion cells are unique to

Accepted Answer

Angiosperms

Question 3

The hormone that stimulates heart beat is

Accepted Answer

Thyroxine

Question 4

The presence of air bubble in blood stream is dangerous to life because

Accepted Answer

The flow of blood is obstructed

Question 5

Which of the following plays an important role in photosynthesis?

Accepted Answer

Chloroplast

Question 6

______ is a thyroid hormone which controls the balance of calcium in the body.

Accepted Answer

Calcitonin is 32-amino acid linear polypeptide hormone that is produced in humans primarily by the parafollicular cells of the thyroid, and in many other animals in the ultimopharyngeal body. It acts to reduce blood calcium, opposing the effects of parathyroid hormone.

Question 7

The cell wall in plants is interrupted by narrow pores carrying fine stands of cytoplasm which interlink the contents of the cells. These strands are called:-

Accepted Answer

Plasmodesmata are interrupted by narrow pores carrying fine strands of cytoplasm, which interlink the contents of the cells.

Question 8

An irregular mode of reproduction resulting in the development of an embryo without fertilization is called 1.Parthenogenesis 2.Apogamy 3.Sporophytic budding Select the correct answer using the code given below.

Accepted Answer

In animals, parthenogenesis means development of an embryo from an unfertilized egg cell. In plants parthenogenesis is a component process of apomixis.Apogamy is a type of reproduction, occurring in some ferns, in which the sporophytedevelops from the gametophyte without fusion of gametes.Adventitious embryony also called sporophytic budding, is a type of apomixis in which an embryo develops directly from nucellus or integument tissue.So, all three are correct.

Question 9

Deficiency of fluoride leads to Which one of the following health problems?

Accepted Answer

Fluoride deficiency is a disorder which may cause increased dental caries due to a lack of fluoride in the diet. Dental caries or tooth decay is the breakdown of dental tissues by the acidic products released by the "bacterial fermentation of dietary carbohydrates”

Question 10

The xylem in plants are responsible for:

Accepted Answer

transport of water

Question 11

Which of the following bacterium causes crown gall disease in plants?

Accepted Answer

Agrobacterium tumefaciens

Question 12

Eustachian Tube is located in which part of human body?

Accepted Answer

Ear

Question 13

Which part of the brain plays an important role in motor control?

Accepted Answer

Cerebellum

Question 14

Which one of the following hormones is essential for the uptake of glucose by cells in the human body?

Accepted Answer

Insulin is an anabolic hormone that stimulates glucose and fatty acid uptake into adipose cells, promoting triglyceride synthesis.Glucagon is a peptide hormone, produced by alpha cells of the pancreas. It works to raise the concentration of glucose and fatty acids in the bloodstream, and is considered to be the main catabolic hormone of the body.

Question 15

Which of the following cells do not contain nucleus? 1. Root hair cells 2. Red blood cells 3. Platelets 4. Monocytes Select the correct answer using the code given below.

Accepted Answer

The absence of a nucleus is an adaptation of the red blood cell for its role. It allows the red bloodcell to contain more haemoglobin and, therefore, carry more oxygen moleculesLike red cells, platelets (thrombocytes) have no nucleus.Monocytes have a small spherical nucleus and has abundant dark staining condensed chromatin.There are 5 organelles found in a root hair cell. They are the: nucleus, cytoplasm, cell membrane, cell wall and vacuole.

Question 16

Biological catalysts are protein molecules which 1. speed up a chemical reaction 2. remain unchanged after reaction 3. function optimally at 37 deg C. 4. do not have an enzymatic activity Select the correct answer using the code given below.

Accepted Answer

Enzymes are biological catalysts. Enzymes are the catalysts involved in biological chemical reactions. A fundamental task of proteins is to act as enzymes—catalysts that increase the rate of virtually all the chemical reactions within cells. A catalyst remains chemically unchanged itself at the end of a reaction. Each enzyme has a temperature that it works optimally in, which in humans is around 98.6 degrees Fahrenheit, 37 degrees Celsius –the normal body temperature for humans.

Question 17

Synapse gap is present between which of the following?

Accepted Answer

Two neurons

Question 18

Which one of the following functions is not carried out by smooth endoplasmic reticulum?

Accepted Answer

Smooth Endoplasmic Reticulumdoes not contain ribosomes on its surface for which it is regarded as smooth. So, proteins cannotbe synthesised by SER provided protein synthesis is the primary task of ribosomes.

Question 19

Which one of the following tissues is responsible for increase of girth in the stem of a plant?

Accepted Answer

In vascular plants, the lateral meristem is one of two meristems in which growth occurs in order to increase stem girth. A meristem is the region of plant tissue found on the tips of roots and shoots. It is where cell division occurs to produce new growth.

Question 20

Which one of the following organisms is dependent on saprophytic mode of nutrition?

Accepted Answer

Saprophytic fungi feed on dead plant and animal remains. Many are extremely beneficial, breaking down this organic material into humus, minerals and nutrients that can be utilised by plants. Agaricus is one among them.

Biology Questions