CBSE Questions for Class 6 Biology Getting To Know Plants Quiz 1 - MCQExams.com

• The roots give out fine hair-like outgrowths called the root hairs that absorb water and minerals

• The main function of the leaf is photosynthesis. The whole plant gets food through photosynthesis. The leaves have a photosynthetic pigment chlorophyll, which converts light energy into chemical energy. 
• The leaf is also involved in the transpiration process. The transpiration process helps in the cooling of the plant. 
• The exchanges of gases take place through stomata present on the leaves. 
• Yet, the most important function of a leaf is photosynthesis. 

• Photosynthesis is a chemical reaction that takes place inside a plant, producing food for the plant to survive. Carbon dioxide, water and light are all needed for photosynthesis to take place.
• During photosynthesis, the plant uses the energy of sunlight and convert carbon dioxide and water into carbohydrates and oxygen. Thus, oxygen is released during photosynthesis.

$$\textbf{Correct Option B}$$

$$\textbf{Solution}$$

$$\bullet$$ $$\textbf{Option A}$$  Respiration is the process in which the oxygen is inhaled and the carbon dioxide is exhaled. This process helps in breaking down the sugar and obtaining energy.

$$\bullet$$ $$\textbf{Option B}$$ Photosynthesis is a process in which the light energy absorbed from the sun is converted into chemical energy. In this process the plant uses the light energy from the Sun and creates oxygen and energy in the form of sugar.

$$\bullet$$ $$\textbf{Option C}$$ Transpiration is the process of evaporation of water from the plant through the aerial parts like leaves stems and flowers.

$$\bullet$$ $$\textbf{Option D}$$ Metabolism is the process through which an organism converts its food intake into energy for the functioning after body.

So, the correct option is B. 

• Photosynthesis is a chemical reaction that takes place inside a plant, producing food for the plant to survive. Carbon dioxide, water and light are all needed for photosynthesis to take place. Chlorophyll is a green photosynthetic pigment found in plants, algae, and cyanobacteria. Chlorophyll is vital for photosynthesis, it allows plants to absorb energy from light.
• Iodine solution is not required for photosynthesis.

• Sepal - Protect the flower in the bud. It is often green. 
• Petals - Brightly colored in insect-pollinated plants. It is small or non-existent in wind-pollinated plants. 
  
• Stamen - The male part of the plant which produces the pollen. 
• Carpel - The female part of the plant which produces fruit once pollination has taken place. 

$$\textbf{Correct option: B}$$

$$\textbf{Solution:}$$

Option A:

$$\bullet$$ The male reproductive part of flower is called stamen.

$$\bullet$$ Stamens are made up of a tubular structure called filament attached to receptacle. A lobular structure, called anther is present on the free end of the stamen which produces pollen grains inside it.

Option B:

$$\bullet$$ The female reproductive part of the flower is called pistil or carpel.

$$\bullet$$ It has three components, which are Sigma, Style and Ovary.

$$\bullet$$ It has a receptacle for pollen grain at top, called stigma. Stigma is joined with the ovary through a tubular part called style. Ovary is the bottom bulged part of the pistil that has female gametophyte called ovule inside it.

Option C:

$$\bullet$$ Pollen tube is germinated from pollen grains when they get landed on the stigma of flower and pollen-pistil interaction occurs.

$$\bullet$$ Pollen tube transfers male gametes to the embryo sac in which female gamete is present.

Option D:

$$\bullet$$ Petals are the bright colored modified leaves of the flower. The whorl containing petals is called corolla and it attracts insects towards flower for pollination to take place.

Hence the correct option is option B.

• Stamen is the male reproductive part of the flower. It has anther and filament. Anther of stamen produces pollen grains that contain male gametes.
• Stigma is a part of female reproductive structure of flower i.e. carpel.
• Egg is female gamete while pollen tube help in transfer of male gamete into the embryo sac.

• Veins represent the vascular supply of leaf. 
• Veins have both xylem and phloem tissues. In reticulate venation, veins divide and subdivide into finer veins, starting from main vein. 
• As vascular elements are present in veins, they transport and distribute sap to all parts of leaves. 
• Xylem elements transport water and minerals, while phloem cells transport photosynthates.