Download App

How do Organisms Reproduce? — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceHow do Organisms Reproduce?5 Marks
Question
Give one example each of unisexual and bisexual flowers. Differentiate between the two types of pollination that occur in flowers. What happens when a pollen lands on a suitable stigma? Write about the events that occur till the seed formation in the ovary.
✓

Answer

Unisexual Flower: Papaya/Watermelon.
Bisexual Flower: Hibiscus/Rose.
Self-pollination: The pollen grains are transferred from the anther to the stigma of the same flower or to the flower of the same plant.
Cross pollination: The pollen grains are transferred from the anther to the stigma of a flower of a different plant.
  • After pollen lands on a suitable stigma, a pollen tube grows out of pollen grain and travels through the style to reach the ovary.
  • The male germ cell fuses with the female germ cell to form a zygote.
  • Zygote divides several times to form an embryo within the ovule.
  • The ovule develops tough coat and gradually gets converted into a seed.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[5 marks Questions]" from How do Organisms Reproduce?→How do Organisms Reproduce? — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

A and B are the two systems of control and coordination in the human body. The messages in system A are transmitted in the form of chemical substances C which travel comparatively slowly through the blood stream. The substances C are made in tissues D present in the head and trunk of human body. The messages in system b are transmitted very quickly in the form of electrical impulses through fibres E. The effect of messages transmitted by system b usually lasts for a much shorter time as compared to those transmitted by system A.
  1. Name the system A. What does system A consist of?
  2. Name the chemical substance C.
  3. What is tissue D? Name any five such tissues in the human body.
  4. Name the system B. What does system B consist of?
  5. Name the fibres E.
  6. State whether system A controls the working of system B or system B controls the working of system A.
→
Excretion is different in multi-cellular organisms as compared to unicellular organisms. How?
→
Write a few steps to reduce consumption of coal and petroleum.
→
Draw the structure of a neuron and explain its function.
→
Describe the parts of our tooth with the help of a labelled diagram.
→
Rishi went to a palmist to show his palm. The palmist used a special lens for this purpose.
i. State the nature of the lens and the reason for its use.
ii. Where should the palmist place/hold the lens so as to have a real and magnified image of an object?
iii. If the focal length of this lens is 10 cm and the lens is held at a distance of 5 cm from the palm, use lens formula to find the position and size of the image.
→
Why do we need to manage our natural resources?
→
In the circuit diagram given below five resistances of $10 Ω, 40 Ω, 30 Ω, 20 Ω\ \text{and}\ 60 Ω$ are connected as shown to a 12V battery.
Calculate:
  1. Total resistance in the circuit.
  2. Total current flowing in the circuit.
→
What is lens formula? Give its sign conventions and assumptions.
→
Explain the principle of working of a thermal power plant. Draw a labelled diagram to illustrate your answer.
→