Day 7: CBSE Class 10 Science
5 questions. Try each one first, then open its answer.
Question 1
How do Organisms Reproduce?. Asked 3 times: 2023*, 2025*, 2026 (* = numbers or wording changed that year)
16 (a)(i) Name an organ that helps in the formation of male germ cells in humans and also mention the condition that favours the formation of male germ cells. (ii) In male reproductive system, write the pathway followed to deliver male germ cells to the site of fertilisation. (iii) Mention the main physical feature of the male germ cell that helps it move towards the female germ cell.Question 2
How do Organisms Reproduce?. Asked 3 times: 2024*, 2025*, 2026 (* = numbers or wording changed that year)
16 (A)(i) In an angiospermic flower, fertilization is said to take place when male gametes carried in the pollen tube fuse with the female gamete, present in the embryo sac. This results in lot of changes in different parts of the flower. State the changes taking place in the following structures of flower post fertilization : (a) Zygote (b) Ovule (c) Ovary (d) Sepals (ii) Define germination.Question 3
How do Organisms Reproduce?. Asked 3 times: 2022*, 2025*, 2026 (* = numbers or wording changed that year)
12Draw a neat diagram to show germination of pollen on the female reproductive part of the flower. Name and label only the following parts : (a) The part that receives the pollen grain. (b) The structure that carries the male germ cell to reach the female germ cell.Question 4
Life Processes. Asked 3 times: 2023*, 2024*, 2026 (* = numbers or wording changed that year)
10(a) Why is bile juice considered to be very important for digestion, even though it doesn’t contain any digestive enzymes ? (b) Name some substances present in initial filtrate and subsequently selectively reabsorbed in the tubules of nephron.Question 5
Life Processes. Asked 3 times: 2023*, 2025*, 2026 (* = numbers or wording changed that year)
12Separation of right side and left side of the heart is useful to keep oxygenated and deoxygenated blood from mixing. Various organisms have different types of heart. (I) Fill in the blanks (i) to (iii) correctly according to the type of organisms and their evolution in terms of blood circulation :(II) Which type of circulation is most efficient ?Organisms Number of chambers in heart Type of blood being circulated Type of circulation Fish (i) ______ Mixed Single (ii) ______ 3-chambered Mixed Incomplete double circulation Birds and Mammals 4-chambered Separated circulation path of oxygenated and deoxygenated blood (iii) ______