Biology Mock Test- 2 - Class 9 MCQ

The practice of cultivating two or more crops simultaneously on the same piece of land is called mixed cropping. During mixed cropping, if one crop faces adverse conditions or pathogen attack then the other crop can be saved.

Advantages of mixed cropping:
Increase in yield
Optimum utilization of soil
Minimum pest infestation
No risk of crop failure
Farmers can harvest varieties of produce at the same time

River lift system is where water from rivers is drawn directly to supplement irrigation schemes. River lift systems do not depend on the natural flow of water from rivers by gravity through canals, rather it employs other means such as pumps and direct fetching. This system is used in regions where the water flow from the canals or reservoirs is insufficient to supply the farms. 

It is a gel-like matrix composed of water, enzymes, nutrients, wastes, and gases and contains cell structures such as ribosomes, a chromosome, and plasmids. The cell envelope encases the cytoplasm and all its components. Unlike the eukaryotic (true) cells, bacteria do not have a membrane enclosed nucleus.

The outer structure (1) is the cell wall.

Then the genetic data(2) is nucleoid.

The second layer(3) is the plasma membrane.

A prokaryotic cell does not have a defined nucleus; the nuclear material in a prokaryote is known as a nucleoid. DNA present in the nucleoids of prokaryotes is of circular, double stranded type which is tightly coiled. Hence, due to the circular structure and tight coiling, the DNA in prokaryotes is not scattered throughout the cell, even though the cell has no defines nucleus.

A is the correct option.The protein deposited in the dead superficial cells that make the skin epithelium impervious to water is Keratin which makes this epithelium impervious to water.

These exocrine glands are enlarged and modified sweat glands and are the characteristic of mammals which gave the class its name. The basic components of the mammary gland are the alveoli (hollow cavities, a few millimetres large) lined with milk-secreting cuboidal cells and surrounded by myoepithelial cells.

- Dry apricots when placed in pure water swell due end osmosis (inward movement of water) and later when are transferred sugar solution exosmosis (outward movement of water) occurs and they shrink again.
- When a Red Blood Cell is placed in concentrated saline solution exosmosis occurs and the RBCs shrink due to excess loss of water.

B is the correct option.Hyaline cartilage is a type of connective tissue found in areas such as the nose, ears, and trachea of the human body. The word hyaline means “glass-like”, and hyaline cartilage is a glossy, greyish-white tissue with a uniform appearance.

Fish farming or pisciculture involves raising fish commercially in tanks or enclosures such as fish ponds, usually for food. It is the principal form of aquaculture, while other methods may fall under mariculture. A facility that releases juvenile fish into the wild for recreational fishing or to supplement a species' natural numbers is generally referred to as a fish hatchery.

There are only four pure Indian breeds of chicken available.
Aseel. It is noted for its pugnacity, high stamina, majestic gait and dogged fighting qualities.
Chittagong. It is also known as Malay.
Kadaknath. The skin, beak, shanks, toes and soles of feet are slate-like in colour.
Busra.

Foot-and-mouth disease (FMD) is a severe, highly contagious viral disease of cattle and swine. The disease is caused by a virus of which there are seven ‘types’, each producing the same symptoms, and distinguishable only in the laboratory. Animals pick up the virus either by direct contact with an infected animal or by contact with foodstuffs or other things which have been contaminated by such an animal, or by eating or coming into contact with some part of an infected carcase.

Protoplasm is known as the physical basis of life in a cell because it comprises the living part of the cell including the cytoplasm, nucleus and other organelles and carries out all the processes necessary for life, like processing nutrients and oxygen, converting food into living matter, throwing out of used substances, producing new cells etc.

• Bos indicus: Also known as zebu cattle, Bos indicus is a species of cattle that is native to the Indian subcontinent. They are known for their humped appearance and are well adapted to hot and tropical climates.



• Bos bubalis: This species refers to water buffalo, which is commonly found in India. They are used for milk production, meat, and as draft animals in agriculture.

• The correct answer is option A: (i) and (iii) - Bos indicus and Bos bubalis are Indian cattle species.


• Bos domestica and Bos vulgaris are not specific Indian cattle species.


• Indian cattle play a significant role in the country's agriculture and dairy industry.


• Understanding the different species of Indian cattle is essential for livestock management and breeding purposes.

The full form of ATP is adenosine tri phosphate. It is known as energy currency of the cell.

Sulphur is an essential nutrient for plant growth. Most of the sulphur in soils is found soil in organic matter . However, it is not available to plants in this form. In order to become available to plants, the sulphur must be first released from the organic matter and go through mineralization process.

All plants require nitrogen, phosphorus and potassium as their primary nutrient. Thus oxygen is not considered as primary nutrient for plants.

Each liver lobe is formed of hexagonal lobules surrounded by a connective tissue sheath called Glisson?s capsule.

Histamine, involved in allergic and inflammatory reactions, is secreted by mast cells that are found in connective tissue. They are small oval cells having abundant large granules in the cytoplasm.

The cell was first discovered by Robert Hooke in 1665 using a microscope. The first cell theory is credited to the work of Theodor Schwann and Matthias Jakob Schleiden in the 1830s.

The Catla fish is an economically very important South Asian freshwater fish. It is in the carp family Cyprinidae. It is known by many different names such as Katla, Katol, Indian Major carp, Chepti, Baudhekra, Bacha, Karakatla and Tambra. The fish is mainly found in the rives and lakes in northern India, Bangladesh, Nepal, Pakistan and Myanmar.

The amount of humus found in soil also increases with higher rate of decomposition, which is beneficial for the growth of crop succeeding the green manure crop.

Surface feeder takes its food from air water interface or feeds just below water surface. Catla is common fresh water fish variety and is a major surface feeder. The fresh water resources include river, canals, lakes reservoirs etc. 

Exotic cattle were first introduced into this region by colonial farmers. Thus, the origin of exotic cattle is generally traced back to Europe. The most common exotic dairy breeds in the region are Friesian, Holstein, Ayrshire, Jersey, Guernsey and Sahiwal. However, the Friesian breed predominates.

Husk of coconut is made up of sclerenchymatous tissue.

It is present in mesocarp of fruit of coconut and a yield a coir a well known fibre used for making mats, ropes, cords, brushes e.t.c.

Sclerenchymatous tissue are found in stems( around the vascular bundle) , roots, vein of leaves, hard coverings of seeds and nuts.

The function of sclerenchymatous tissue is mainly mechanical & protective. It gives strength , rigidity ,flexibility and elasticity to the plant body.

Striated muscles can be controlled by one's own conscious will. Muscles present in our legs are striated muscles hence the following action will be executed by striated muscles present in the legs.