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Zoology Test Paper

Description: Online Study Material for Medical Entrance, Class XI, Class XII, M.Sc, Animal taxonomy, Class XI Biology, Class XII Biology, Zoology, Anatomy, Animal anatomy, Animal cognition, Animal communication, Animal physiology
Number of Questions: 45
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Tags: Zoology Medical Entrance Class XI / XII NTSE / Olympiad M.Sc Animal Taxonomy Class XI Biology Class XII Biology Anatomy Animal Anatomy Animal Cognition Animal Communication Animal Physiology Transpiration Nutrient Deficiency Symptoms Deficiency of Mineral Elements in Plants Nitrogen Cycle Absorption and Transport of Nutrients. Uptake and Transport of Mineral Ions Alkali Metals
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Which of the following elements has not been proved to be essential for plants?

  1. Nitrogen

  2. Sodium

  3. Zinc

  4. Potassium


Correct Option: B
Explanation:

Sodium is not generally regarded as an essential nutrient for plants. However, sodium can substitute for potassium to a greater or lesser extent in different plant species.

Which of the following is not an essential micronutrient?

  1. Nickel

  2. Manganese

  3. Cobalt

  4. Boron


Correct Option: A
Explanation:

  Nickel is not an essential micronutrient.

Deficiency of molybdenum causes

  1. bending of leaf tip

  2. chlorosis of leaves

  3. mottling and necrosis of leaves

  4. poor development of vasculature


Correct Option: C
Explanation:

 Deficiency of molybdenum causes mottling and necrosis of leaves.

Which of the following elements is necessary for translocation of sugars in plants?

  1. Boron

  2. Molybdenum

  3. Manganese

  4. Iron


Correct Option: A
Explanation:

 Boron is necessary for translocation of sugars in plants.

Absence of magnesium from plant tissue results in

  1. etiolation

  2. hydrolysis

  3. chlorosis

  4. necrosis


Correct Option: C
Explanation:

Magnesium ion is present in the center of a chlorophyll molecule. Its deficiency causes the yellowing or whitening of normal green plant tissue which is known as chlorosis. 

Death of the stem and root tips occurs due to deficiency of

  1. calcium

  2. nitrogen

  3. carbon

  4. phosphorus


Correct Option: A
Explanation:

Death of the stem and root tips occurs due to deficiency of calcium.

Root hairs do not play any role in

  1. mineral uptake

  2. water uptake

  3. CO2 uptake

  4. Both (1) and (2)


Correct Option: D
Explanation:

 Root hairs do not play any role in both water and mineral intake.

Plant ash is an indication of

  1. mineral salts absorbed by the plant

  2. organic matter of the plant

  3. mineral salts and organic matter

  4. None of these


Correct Option: A
Explanation:

Plant ash is an indication of mineral salts absorbed by the plant.

Active mineral absorption depends on

  1. expenditure of energy

  2. ions moving freely

  3. ions moving passively

  4. ions moving actively


Correct Option: A
Explanation:

 Active mineral absorption depends on expenditure of energy.

Which of the following is a macronutrient?

  1. Ca

  2. Mo

  3. Zn

  4. Mn


Correct Option: A
Explanation:

Calcium is a macronutrient. It is an essential part of the plant cell wall and helps in the transport and retention of other elements.

Which of the following micronutrients can be absorbed by foliage?

  1. Zinc

  2. Iron

  3. Phosphorus

  4. None of these


Correct Option: A
Explanation:

Zinc can be absorbed by foliage. Zinc deficiencies can affect plant by stunting its growth, decreasing number of tillers, chlorosis and smaller leaves, increasing crop maturity period, spikelet sterility and inferior quality of harvested products.

Which of the following pigments is essential for nitrogen fixation by leguminous plants?

  1. Phycocyanin

  2. Phycoerythrin

  3. Leghaemoglobin

  4. Myoglobin


Correct Option: C
Explanation:

In leguminous plants, leghaemoglobin regulates the supply of oxygen to nodule tissue. Therefore, it is essential for nitrogen fixation.

Which root tissue primarily contributes to the formation of nodules, particularly in legume family?

  1. Epidermis

  2. Xylem

  3. Cortex

  4. Endodermis


Correct Option: C
Explanation:

  Cortex primarily contributes to the formation of nodules, particularly in legume family.

The transpiration in the plants will be lowest when

  1. there is high humidity in the atmosphere

  2. wind velocity is high

  3. environmental conditions are very dry

  4. there is excess of water in the cell


Correct Option: A
Explanation:

High humidity restricts the transpiration because humid air is almost saturated with water vapour and cannot absorb much more by transpiration.

Which enzyme is responsible for the reduction of molecular nitrogen to the level of ammonia in leguminous root nodules?

  1. Nitrogenase

  2. Nitrate reductase

  3. Nitrite oxidase

  4. Hexokinase


Correct Option: A
Explanation:

Nitrogenase enzyme is present in the root nodules of leguminous plants, which helps in the conversion of atmospheric free nitrogen into ammonia.

A trace element

  1. is radioactive and can be traced by geiger-count

  2. is required in very minute amounts

  3. draws other elements out of protoplasm

  4. was one of the first to be discovered in protoplasm


Correct Option: B
Explanation:

Trace element is an element that is required in minute quantities for physiological functioning.

The symbiotic fixation of atmospheric nitrogen in root nodules of leguminous crops is brought about by

  1. rhizobium

  2. rhizopus

  3. rhizoclonium

  4. rhizoctonia


Correct Option: A
Explanation:

 Rhizobium is a symbiotic bacteria present in the root nodules of leguminous plants. It contains the enzyme nitrogenase that helps in the conversion of atmospheric free nitrogen into ammonia.

In nitrogen cycle, nitrite is converted to nitrate by

  1. azotobacter

  2. rhizobium

  3. nitrobacter

  4. nitrosomonas


Correct Option: C
Explanation:

Nitrobacter bacteria play a major role in the nitrogen cycle, mostly by transforming nitrites into nitrates. 

Organisms that fix nitrogen in aquatic habitats are

  1. diatoms

  2. protozoans

  3. desmids

  4. cyanobacteria


Correct Option: D

Which element forms a part of structure of chlorophyll molecule?

  1. Mg

  2. Mn

  3. K

  4. Fe


Correct Option: A
Explanation:

The molecular structure of chlorophyll consists of a N-ring with a Mg center, side chains, and a hydrocarbon tail.

Which one of the following essential elements can be obtained by land plants directly from the air?

  1. Carbon

  2. Nitrogen

  3. Phosphorus

  4. Hydrogen


Correct Option: A

Deficiency of iron causes

  1. decrease in protein synthesis

  2. interveinal chlorosis on young leaves

  3. bending of stem tip

  4. reduced leaves and stunted growth


Correct Option: B

Exanthema, a disease of citrus plant, is caused due the deficiency of

  1. zinc

  2. magnesium

  3. manganese

  4. copper


Correct Option: D

Which of these is not a nutrient for plants?

  1. Water

  2. Mineral ions

  3. Carbon dioxide

  4. Nitrogen gas


Correct Option: D

Which of the following elements is a component of ferredoxin?

  1. Manganese

  2. Zinc

  3. Iron

  4. Copper


Correct Option: C

Which of the following is a component of middle lamella in plant cells?

  1. Mg

  2. K

  3. Ca

  4. Fe


Correct Option: C

Which of the following is a micronutrient?

  1. Mg

  2. Zn

  3. P

  4. K


Correct Option: B

Symbiotic nitrogen fixation by rhizobium was discovered by

  1. Louis Pasteur

  2. Lister

  3. Beijerinck

  4. Pfeffer


Correct Option: C
Explanation:

Martinus Willem Beijerinck was a Dutch microbiologist and botanist. In 1901, he discovered that symbiotic nitrogen fixation is done by rhizobium.

80 per cent of a cell is constituted by

  1. minerals

  2. water

  3. proteins

  4. carbohydrates


Correct Option: B

Which one of the following statements is correct?

  1. Legumes fix nitrogen only through specialized bacteria that live in their leaves.

  2. Legumes fix nitrogen independent of any specialized association.

  3. Legumes fix nitrogen only through the specialised bacteria that live in their roots.

  4. Legumes are incapable of fixing nitrogen.


Correct Option: C

A crop plant that can grow well in nitrogen deficient soil without addition of manure is

  1. allium sativum

  2. triticum aestivum

  3. solanum melongena

  4. cajanus cajan


Correct Option: D

Iron is mainly absorbed in

  1. ferrous ion form

  2. ferric ion form

  3. Both (1) and (2)

  4. atomic form


Correct Option: B

NPK stands for

  1. nitrogen, protein, kinetic

  2. nitrogen, protein, potassium

  3. nitrogen, phosphorus, potassium

  4. nitrogen, phosphorus, kinetin


Correct Option: C
Explanation:

NPK stands for Nitrogen (N), Phosphorous (P) and Potassium (K). 

All of the following contributes to the availability of nitrogen compounds in the soil, except

  1. azotobacter

  2. thunders from clouds

  3. bacterial decay of animal refuse

  4. addition of lime


Correct Option: D

Plants require the two metallic compounds for chlorophyll synthesis viz.

  1. Fe and Mg

  2. Cu and Ca

  3. Ca and K

  4. Mg and Ca


Correct Option: A

Phosphorus is a structural element in

  1. proteins

  2. carbohydrates

  3. DNA

  4. cytochrome


Correct Option: C

Conversion of organic nitrogenous compound into ammonium compound is called

  1. nitrification

  2. denitrification

  3. ammonification

  4. none of the above


Correct Option: C
Explanation:

Ammonification is the conversion of organic nitrogen to ammonium (NH4+) by the action of decomposers (bacteria).

The bulk of nitrogen in nature is fixed by

  1. chemical industries

  2. symbiotic bacteria

  3. lightning discharge

  4. denitrifying bacteria


Correct Option: B

Which of the following essential elements is not a constituent of any enzyme, but stimulates the activity of many enzymes?

  1. Zn

  2. K

  3. Mg

  4. Mn


Correct Option: B

Most of the plants obtain nitrogen from the soil in the form of

  1. nitric acid

  2. nitrites

  3. nitrates

  4. free nitrogen gas


Correct Option: C

Carbon is available to crop plants in the form of

  1. carbonates

  2. carbon dioxide

  3. elemental carbon

  4. amino acids


Correct Option: B

The most important use of potassium is that

  1. it regulates many plant processes

  2. it provides red colour to the fruit

  3. it helps in photosynthesis

  4. it influences enzyme activity, which regulates many plant processes


Correct Option: D

A bulk of nitrogen in nature is fixed by

  1. lightning discharge

  2. denitrifying bacteria

  3. symbiotic bacteria

  4. none of the above


Correct Option: C
Explanation:

 Rhizobium is the most commom symbiotic bacteria, which carry out the nitrogen fixation.

In plants, a common symptom caused by deficiency of P, K, Ca and Mg is

  1. formation of anthocyanin

  2. shedding of leaf

  3. bending of leaf tip

  4. development of necrotic areas on leaves


Correct Option: D

Micronutrients

  1. are called micro because they play only a minor role in plant nutrition

  2. may be omitted from culture media without any detrimental effect on the plants

  3. are as important in nutrition as the macronutrients

  4. are more important in nutrition than macronutrients


Correct Option: C
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