The breakdown of detritus into small particles by detritivores is called
Leaching
Humification
Catabolism
Mineralization
Mineralization
E.
Fragmentation
Decomposition is the process by which organic substances are broken down into a more simple organic matter. The important steps in the process of decomposition are-
1. Fragmentation: Breakdown of detritus into smaller particles by the use of detrivores such as earthworm.
2. Leaching: Using this process, water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavilable salts.
3. Catabolism: Bacterial and fungal enzymes degrade detritus into simpler inorganic substances.
4. Humification: It is the process of formation of humus. It is highly resistant to microbial action.
5. Mineralisation: Degradation of humus by microbes and release of inorganic nutrients is known as mineralisation.
Select the plants pollinated by water
(A) Water hyacinth
(B) Zostera
(C) Amorphophallus
(D) Vallisneria
(E) Yucca
(A), (D) and (E) only
(B) and (E) only
(B) and (D) only
(B), (C) and (D) only
(B), (C) and (D) only
Which of these is/are wrongly matched?
(1) Alkaloid - Codeine
(2) Lectin - Morphine - Morphine
(3) Toxin - Abrin
(4) Terpene - Curcumin
(1) and (3) only
(2) and (3) only
(2) and (4) only
(3) and (4) only
(3) and (4) only
Choose the wrong statement regarding the circulatory system of frog
Sinus venosus receives blood through major veins called vena cava
The ventricle opens into a sac like conus arteriosus
The erythrocytes are nucleated
Special venous connection between liver and intestine called renal portal system is present
Special venous connection between liver and intestine called renal portal system is present
An orchid growing as an epiphyte on a mango tree is an example for
Parasitism
Predation
Commensalism
Mutualism
Mutualism
Which of the following feature(s) is/are common to both wind and water pollinated flowers?
I. Pollen grains are long and ribbon-like.
II. Stigma is large and feathery.
III. The flowers are not colourful.
IV. The flowers do not produce nectar.
III and IV only
II and III only
I and II only
II only
II only
The ozone hole over Antarctica develops each year between
Late December and early February
Late February and early April
Late April and early June
Late August and early October
Late August and early October
Tendons, which attach one bone to another bone are made up of
Dense regular connective tissue
Dense irregular connective tissue
Areolar tissue
Adipose tissue
Adipose tissue
Which of the following statements regarding responses of organisms to abiotic factors is false?
All birds and mammals are capable of thermoregulation.
Majority of animals and nearly all plants cannot maintain a constant internal environment.
Shivering is a kind of exercise which produces heat and raises body temperature.
Very small animals are commonly found in polar regions as they have to spend less energy to generate body heat
Very small animals are commonly found in polar regions as they have to spend less energy to generate body heat
Read the following statements and choose the correct answer.
i. Gap junctions cement adjacent cells together
ii. Areolar tissue contains fibroblasts, macrophages and mast cells
iii. Tight junctions facilitate the cells to communicate with each other
iv. Adhering junctions help to stop substances from leaking across tissues
v. Cells of connective tissue except blood secrete fibres of structural proteins called elastin
i, ii and iii only are wrong
i, iii and iv only are wrong
iii and v only are wrong
i, ii and v only are wrong
i, ii and v only are wrong
