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Suresh prepares slides with pollen grains in different sugar concentrations (0%, 2.5%, 5%, 7.5%, 10%) to study the germination of pollen. (i) What are the different hypotheses which can be tested using this set-up? (ii) What parameters should be kept the same in this set-up?
(i) Testable hypotheses: Pollen germination percentage increases with rising sugar concentrations up to an optimal level and declines thereafter; alternatively, higher sucrose levels accelerate the elongation rate of pollen tubes. (ii) Controlled parameters: The plant species from which pollen is soRead more
(i) Testable hypotheses: Pollen germination percentage increases with rising sugar concentrations up to an optimal level and declines thereafter; alternatively, higher sucrose levels accelerate the elongation rate of pollen tubes. (ii) Controlled parameters: The plant species from which pollen is sourced, volume of sugar solution added, ambient temperature, humidity and duration of observation must remain identical for all slides.
For more NCERT Solutions of Class 9 Science Exploration Chapter 11 Reproduction How Life Continues Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-11/
See lessLook at the picture given below and think in line with the given prompts and find out which type(s) of pollination might have been followed in these flowers — Tomato, Wheat, Papaya.
(i) Tomato: Primarily undergoes self-pollination because the fused stamens closely surround and enclose the stigma, facilitating direct pollen transfer within the same flower. (ii) Wheat: Undergoes self-pollination since pollination takes place before the floral glumes open, ensuring pollen falls diRead more
(i) Tomato: Primarily undergoes self-pollination because the fused stamens closely surround and enclose the stigma, facilitating direct pollen transfer within the same flower. (ii) Wheat: Undergoes self-pollination since pollination takes place before the floral glumes open, ensuring pollen falls directly on its own feathery stigma. (iii) Papaya: Strictly follows cross-pollination because it is dioecious, bearing male and female flowers on entirely separate trees.
For more NCERT Solutions of Class 9 Science Exploration Chapter 11 Reproduction How Life Continues Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-11/
See lessIn the lower Himalayan region of northern India, apples are an important cash crop that contribute significantly to farmer’s livelihoods. The fruit yield in apple cultivation is declining continuously, associated with climate change and a significant decline in the population of natural pollinators. A researcher-farmer group set up two experimental apple orchards at two distinct locations: Places A and B. In apple orchards at Place A, they allowed natural pollinators to pollinate the flowers of the apple. In apple orchards at Place B, they applied mixed farming techniques of beekeeping. Along with honey, the farmer yielded apples. The yield of apples is depicted in Fig. 11.24, in terms of fruit setting (number of fruits/the total number of corresponding fruit-bearing branches) and fruit drop (premature falling of developing fruits) in the two types of experimental places of apple orchards. (i) What are the hypotheses the researcher-farmers group has thought of for this investigation? (ii) What are the different parameters in the experiment? (iii) Compare and analyse the data of two experimental orchards Places A and B, in terms of high yields of apple fruits. (iv) Based on your analysis, what do you infer from the data?
(i) Hypotheses: Introducing managed bee colonies increases pollination efficiency, leading to higher fruit set and reduced premature fruit drop compared to natural pollination alone. (ii) Parameters: The independent variable is the pollination method (natural pollinators versus managed beehives); deRead more
(i) Hypotheses: Introducing managed bee colonies increases pollination efficiency, leading to higher fruit set and reduced premature fruit drop compared to natural pollination alone. (ii) Parameters: The independent variable is the pollination method (natural pollinators versus managed beehives); dependent variables are percentages of fruit set and premature fruit drop. (iii) Data analysis: Place B achieved a 40% fruit set and only 8% fruit drop, outperforming Place A’s 26% fruit set and 35% fruit drop. (iv) Inference: Integrating beekeeping significantly improves pollination success, maximizes fruit retention and enhances overall apple yields.
For more NCERT Solutions of Class 9 Science Exploration Chapter 11 Reproduction How Life Continues Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-11/
See lessA student claims, “In humans, ovulation always happens on day 14 of the menstrual cycle”. Critically examine this claim and state whether the claim is correct or not. Give at least two reasons for your answer.
The student's claim is incorrect. Day 14 ovulation applies only as a generalized midpoint within a textbook 28-day cycle. In reality, normal menstrual cycle lengths range between 21 and 35 days, shifting ovulation timing accordingly. Furthermore, external factors such as physical illness, nutritionaRead more
The student’s claim is incorrect. Day 14 ovulation applies only as a generalized midpoint within a textbook 28-day cycle. In reality, normal menstrual cycle lengths range between 21 and 35 days, shifting ovulation timing accordingly. Furthermore, external factors such as physical illness, nutritional intake, stress and lifestyle variations cause hormonal fluctuations that frequently alter the exact day an ovary releases a mature egg.
For more NCERT Solutions of Class 9 Science Exploration Chapter 11 Reproduction How Life Continues Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-11/
See lessWhy does asexual reproduction produce offsprings that are genetically identical to the parent?
Asexual reproduction requires only a single parent, avoiding the involvement and fusion of two separate gametes. Cell division occurs exclusively through mitosis, which replicates the parent DNA precisely and distributes identical sets of chromosomes into each daughter cell. Because there is no meioRead more
Asexual reproduction requires only a single parent, avoiding the involvement and fusion of two separate gametes. Cell division occurs exclusively through mitosis, which replicates the parent DNA precisely and distributes identical sets of chromosomes into each daughter cell. Because there is no meiosis to mix parental traits or create genetic variation, the resulting offspring are exact clones.
For more NCERT Solutions of Class 9 Science Exploration Chapter 11 Reproduction How Life Continues Question Answer (2026-27)
https://www.tiwariacademy.com/ncert-solutions/class-9/science/exploration-chapter-11/
See less