Biology
A potted plant with variegated leaves was taken in order to prove a factor necessary for photosynthesis. The potted plant was kept in the dark for 24 hours and then placed in bright sunlight for a few hours. Observe the diagrams and answer the questions.
(i) What aspect of photosynthesis is being tested in the above diagram?
(ii) Represent the process of photosynthesis in the form of a balanced equation.
(iii) Why was the plant kept in the dark before beginning the experiment?
(iv) What will be the result of the starch test performed on leaf 'A' shown in the diagram? Give an example of a plant with variegated leaves.
(v) Draw a neat labelled diagram of a chloroplast.
Related Questions
Mention the exact location of the following:
(i) Epididymis
(ii) Lacrimal gland
(iii) Malleus
(iv) Hydathodes
(v) Pulmonary semilunar valve
Given below are diagrams showing the different stages in the process of fertilisation of an egg in the human female reproductive tract.
Study the diagrams and answer the questions:
(i) Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of fertilisation.
(ii) Where does fertilisation normally take place? What is 'Implantation' that follows fertilisation?
(iii) Mention the chromosome number of the egg and zygote in humans.
(iv) Explain the term 'Gestation'. How long does Gestation last in humans?
(v) Draw a neat, labelled diagram of a mature human sperm.
The diagram given below shows the internal structure of a spinal cord depicting a phenomenon. Study the diagram and answer the questions:
(i) Name the phenomenon that is depicted in the diagram. Define the phenomenon.
(ii) Give the technical term for the point of contact between the two nerve cells.
(iii) Name the parts numbered 1, 2 and 3.
(iv) How does the arrangement of neurons in the spinal cord differ from that of the brain?
(v) Mention two ways by which the spinal cord is protected in our body.
Give appropriate biological or technical terms for the following:
(i) Process of maintaining water and salt balance in the blood.
(ii) Hormones which regulate the secretion of other endocrine glands.
(iii) Movement of molecules of a substance from their higher concentration to lower concentration when they are in direct contact.
(iv) The condition in which a pair of chromosomes carry similar alleles of a particular character.
(v) The complex consisting of a DNA strand and a core of histones.
(vi) The onset of menstruation in a young girl.
(vii) Squeezing out of white blood cells from the capillaries into the surrounding tissues.
(viii) The fluid which surrounds the foetus.
(ix) The relaxation phase of the heart.
(x) The difference between the birth rate and the death rate.