Morphology of Flowering Plants — BIOLOGY STD 11 Science — Question

On a trip of North-East region, Kirti saw some plants which have big leaves in order to trap organisms. Kirti was amazed and asked her teacher about the reason for absence of such plants in other areas. Teacher replied that such plants grow on soil that is deficient in nitrogen and therefore, catch insects to fulfil their nitrogen requirements.

1. What is the role of nitrogen in plants?
2. Name any two insectivorous plants?
3. What is the nature of such plants? What is the strange thing about them?
4. Which values of Kirti one should imbibe?

Write a brief account of mosses.

Photosynthesis not only facilitates production of food but also cleans up the environment. Which of the following is similar to this multipronged effect of photosynthesis? Explain how deforestation affects our environment.

1. An automobile not only carries people but also releases carbon dioxide in the air.
2. A cow not only gives milk but also produces methane which is a greenhouse gas.
3. A cow not only gives milk but also produces cowdung which can be used as kitchen fuel.

The presence of vertebral column provides additional strength to the body and thus very big animals can be found among vertebrates. Which of the following is similar to this in our surroundings? How important is the proper use of materials and technologies in making buildings? Explain.

1. A tent can be erected with the support of bamboo or iron poles
2. Use of RCC frames makes it possible to build big buildings
3. The weight of the roof stays on the central beam in the house

Neurospora- an ascomycetes fungus has been used as a biological tool to understand the mechanism of plant genetics much in the same way as Drosophila has been used to study animal genetics. What makes Neurospora so important as a genetic tool?

Enlist the different types of amino acids based on the number of carboxyl and amino groups in them. Also, give one example of each of these amino acids.

1. Mention the symptoms of manganese toxicity in plants.
2. How does manganese toxicity result in symptoms of deficiency of iron, magnesium and calcium in plants?

What is the source of energy for muscle contraction?

Diatoms are also called as ‘pearls of ocean’, why? What is diatomaceous earth?

Explain the importance of photosynthesis