CBSE Questions for Class 11 Medical Biology Morphology Of Flowering Plants Quiz 7 - MCQExams.com

• Nodulated roots are bead-like structures on the roots and are found in plants that are associated with Rhizobium the symbiotic nitrogen-fixing bacteria.
  
• Their main function is to give shelter to bacteria.
• Thus, option D is correct.

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

$$\textbf{Solution:}$$

Option A:

$$\bullet$$ Night queen ($$Cestrum$$ $$nocturnum$$) flower opens during night and closes in daytime.

$$\bullet$$ It is an evergreen woody shrub belongs to the $$Solanaceae$$ family.

$$\bullet$$ This plant has smooth, glossy and broad leaves.

$$\bullet$$ The cymose inflorescence of the plant has greenish white colored flowers with very thin slender tubular corolla. the flowers are extremely scented.

Option B:

$$\bullet$$ Touch-me-not plant closes when being touched i.e. it is touch sensitive.

$$\bullet$$ The leaves are compound present as leaflets arranged on a main axis. When these leaves are touched, the leaflets of opposite directions collapses along the main axis.

Option C:

$$\bullet$$ $$Vallisneria$$ is an aquatic plant which is completely submerged in the water.

Option D:

$$\bullet$$ Jasmine is an angiosperm plant which has extremely fragrant flowers.

Hence the correct option is option A.

1. Stamens or androecium are the male reproductive part and responsible for the production of pollen grains (male gamete).
2. Carpels, pistil or gynoecium are the female reproductive part and produce ovum (female gamete).

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

$$\textbf{Solution:}$$

Option D:

$$\bullet$$ The water and minerals are absorbed from the soil through roots but conducted by stem to all aerial parts of the plants such as leaves, flowers, buds, etc.

$$\bullet$$ The xylem tissue present in vascular bundles helps in conduction of water and minerals to various parts of the plant.

Hence the correct option is option D.

1. Maize has an inflorescence of spikelets as flowers are born on an axis called rachilla surrounded by bracts.
2. Datura flower is bell-shaped and a solitary flower.
3. Chrysanthemum often shows solitary head inflorescence.
4. Marigold has spike inflorescence means with short or no pedicel are elongated and unbranched peduncle.

• Through Respiratory roots air enters and passes through the soft spongy tissue. 
• Clinging roots are non-absorptive adventitious roots and found in climbers. They also hold the support firmly by forming claws as in Pothos, Betel, Black pepper, etc. 
• The fleshy root of sweet potato is tuberous. 
• Photosynthetic roots are green, aerial, adventitious roots that prepare food.
• Thus, the correct answer is option B.

• Haustoria are root modifications that can penetrate the vascular structure of other plants. So, the parasitic plant absorbs nourishment by haustoria.
• The clinging roots found in the epiphytes help to fix the plant on the bark of another tree.
• Fibrous root systems are characteristic of monocots in which primary roots are short-lived and, therefore, as the plant develops, these roots are replaced by many fibre-like roots arising from the base of the stem. 
• Velamen is found in aerial roots of orchids (epiphytes) covered by hygroscopic tissue. They absorb water from the atmosphere.