Photosynthesis in Higher Plants — BIOLOGY STD 11 Science — Question

Explain flower symmetry.

Mention any two reasons, which prove that photosynthesis is essential for sustaining life on the earth.

State the factors affecting the oxygen haemoglobin binding.

Write the functions of the following:

1. Eustachian tube.
2. Hypothalamus.

While teaching about the chemistry of life, teacher emphasised that carbohydrates, fats, proteins, vitamins and minerals are important for life in addition to water. Akash was under the impression that fats are not good for body and high cholesterol content generally causes heart related and other problems. Therefore, he asked his father who is a doctor about the role of fats in living organisms.

1. What are fats?
2. What is the average percentage of fats present in a cell?
3. How many fatty acid residues are found in one molecule of fat?
4. What values are indicated from Akash's character?

How is a botanical garden different from a museum? Name any two famous botanical gardens in India.

How do lichens exhibit symbiosis?

Flower is a reproductive unit of a plant.

1. It is morphologically called shoot. Explain.
2. On which part, floral whorls are arranged?

It is absolutely not necessary to produce amylase in an inactive form in our body, but it is not so in the case of trypsin. Give reason.

Kala-azar and oriental sore are spread by:

1. Housefly.
2. Bed bug.
3. Sand fly.
4. Fruit fly.