Biology Mock Test- 4 - Class 9 MCQ

Phloem is composed of various specialized cells called sieve tubes, companion cells, phloem fibres, and phloem parenchyma cells.

Hypotonic solutions are the ones which have a lower concentration of solute than the inside the cell. Water diffuses into the cell to balance the solute concentration on either side (outside and inside) equal. Here the cell swells up due to entry of water by endosmosis. 

Animal feed includes: A. roughage, which is largely fibre,and B. concentrates,which are low in fibre and contains relatively high levels of proteins and other nutrients. Cattle balanced rations containing all nutrition in proportionate amount, besides such nutritions food material, certain feed additives containing micronutrients promote the health and milk output of dairy  animals.

Any complete diet must contain some protein, but the nutritional value of the protein relates directly to its amino acid composition and digestibility. High-quality fishmeal normally contains between 60% and 72% crude protein by weight. Typical diets for fish may contain from 32% to 45% total protein by weight.

Plants that yield pollen and nectar are collectively called bee pasturage or bee forage. India having a wide varieties of floral geography and the bee pasturage also varies. Pollen is a highly proteinaceous food for bees. The plants that produce only pollen are called pollen plants.

Tissues can be categorized based on the cell types that are present. If a tissue contains only one cell type it is called a simple tissue. If a tissue contains more than one cell type it is a complex tissue.
(i) Simple Tissues (made up of one cell type).
(ii) Complex Tissue (made up of more than one cell type)

Correct answer: C

Buffalo Milk provide the right amount of bone-building nutrients, specifically calcium, vitamin D, protein, phosphorus, magnesium, potassium, vitamin B12 and zinc.

Buffalo Milk does not contain Vitamin C. This vitamin is generally found in Broccoli, Tomato, spinach etc

The Murrah breed of water buffalo is kept for dairy production. It has been used to improve the milk production of dairy buffalo in other countries, such as Italy, Bulgaria and Egypt. The Murrah buffalo is jet black in colour, sometimes with white markings on the face or legs. They typically have short and tightly curved horns. Average milk production is 2200 litres in a lactation period of 310 days.

• Nitrogen: Growing a pulse crop between two cereal crops helps in compensating for the loss of nitrogen in the soil.


• Legumes: Pulse crops, such as peas, lentils, and beans, are known as legumes that have the ability to fix nitrogen from the atmosphere into the soil through a symbiotic relationship with nitrogen-fixing bacteria present in their root nodules.


• Nitrogen Fixation: This process of nitrogen fixation by legumes helps in replenishing the nitrogen content of the soil, which is essential for the growth and development of plants.


• Benefit: By growing a pulse crop between two cereal crops, farmers can improve the nitrogen status of the soil naturally, reducing the need for synthetic nitrogen fertilizers and promoting sustainable agricultural practices.

Lysosome is called as the suicide bag of the cell as it contain enzymes for hydrolysis of all cell components in case of injury.

• Killing of plants in field before they grow: Weeds can outcompete crop plants for resources like sunlight, water, and nutrients, leading to the death of crop plants before they have a chance to grow and mature.



• Dominating the plants to grow: Weeds have the ability to grow rapidly and spread quickly, often dominating the area where crop plants are trying to grow. This can hinder the growth and development of crop plants.



• Competing for various resources: Weeds compete with crop plants for resources such as nutrients, water, and space. This competition can lead to a decrease in the availability of these resources for crop plants, impacting their growth and yield potential.



• All of these: The combined effects of weeds on crop plants can have a significant negative impact on crop yield and quality, making it crucial for farmers to manage weed populations effectively to ensure optimal crop growth.

In conclusion, weeds can affect crop plants in various ways, from directly competing for resources to inhibiting their growth and development. It is important for farmers to implement weed control strategies to minimize these effects and promote healthy crop growth.

D is the correct option.The fat stored in adipose tissue comes from dietary fats or is produced in the body. hormone signaling; adipose tissueWhen hormones signal the need for energy, fatty acids and glycerol are released from triglycerides stored in fat cells (adipocytes) and are delivered to organs and tissues in the body.

• Cartilage with muscles


• Bone with muscles


• Ligament with muscles


• Bone with bone

• Tendons:

- Tendons are fibrous connective tissues composed mainly of collagen fibers.
- They are tough and inelastic structures that attach muscles to bones.
- Tendons are responsible for transmitting the force generated by muscles to the bones, enabling movement and joint stability.

• Function of tendons:

- Tendons act as a link between muscles and bones, allowing the transfer of forces from the muscles to the bones.
- They provide stability to joints and help maintain proper alignment during movement.
- Tendons also protect muscles from excessive stretching and provide a mechanical advantage for muscle contraction.

• Tendon injuries:

- Tendons can be subject to injuries such as strains, tears, and ruptures.
- These injuries can occur due to overuse, trauma, or degenerative changes.
- Proper rest, rehabilitation, and sometimes surgical intervention may be required for tendon injuries to heal.

• Different types of connective tissues:

- Cartilage: Connective tissue that provides support and cushioning between bones, such as in the joints.
- Bone: Connective tissue that forms the skeletal system and provides support, protection, and movement.
- Ligament: Connective tissue that connects bone to bone, providing stability to joints.
- Tendon: Connective tissue that connects muscle to bone, enabling movement and joint function.

• Conclusion:

- Tendons are specialized connective tissues that connect muscles to bones.
- They play a crucial role in transmitting the force generated by muscles to the bones, enabling movement and joint stability.
- Tendon injuries can occur and may require rest, rehabilitation, or surgery for proper healing.
- Tendons are distinct from other connective tissues such as cartilage, ligaments, and bones, each serving different functions in the body.

A meristematic tissue is a group of cells. That are in a continuous state of division or retain their power of division. Permanent tissues are composed of mature cells that, after undergoing complete growth, have assumed a definite shape, size and function and have temporarily or permanently lost the power of division.

- Root hair cells absorb water primarily through osmosis.
- Osmosis is the movement of water molecules from a region of higher water potential (soil) to a region of lower water potential (root hair cells) through a selectively permeable membrane.
- Soil water has a higher water potential than the root hair cells due to dissolved solutes in the cell sap.
- This passive process does not require energy, making it efficient for plants to absorb the necessary water for survival.

Mariculture is a specialized branch of aquaculture involving the cultivation of marine organisms for food and other products in the open ocean, an enclosed section of the ocean, or in tanks, ponds or raceways which are filled with seawater.

Summer adaptation capacity/ tolerance to high temperature. Low maintenance requirements. 
Reduction in the size of the egg-laying birds with ability to utilise more fibrous cheaper diets formulated using agricultural by-products.

Sclerenchyma cells are the permanent tissues present in the plants. They provide hardness and stiffness to the plant and are composed of dead cells. This tissue is present in stems around vascular bundles in the veins of leaves and in hard covering of seeds and nuts. e.g., the husk of coconut is made up of sclerenchymatous tissues. The cells of Sclerenchyma are long narrow and thickened due to lignin.

RBCs (Red Blood Corpuscles) will swell if they are placed in a hypotonic solution. The cells will gain water by osmosis. The cells might burst and rupture if they are placed in hypotonic solution for a longer time.

Herbicide, an agent, usually chemical, for killing or inhibiting the growth of unwanted plants, such as residential or agricultural weeds and invasive species. A great advantage of chemical herbicides over mechanical weed control is the ease of application, which often saves on the cost of labour. Most herbicides are considered nontoxic to animals and humans, but they can cause substantial mortality of nontarget plants and the insects that depend on them, especially when applied aerially.

GM crops are made through a process known as genetic engineering. Genes of commercial interest are transferred from one organism to another. Two primary methods currently exist for introducing transgenes into plant genomes. The first involves a device called a 'gene gun'.