How do Organisms Reproduce

CBSE 2027 sample paper · 1 mark

In a controlled experiment, the anthers of a mustard plant's flowers were carefully removed in the bud stage before they matured. The bud was covered with a paper bag. What will be the most likely result for these flowers?

1. They will still produce seeds and fruit through self-pollination.
2. They will attract more insects and produce larger flowers but no fruit.
3. They will not produce any seeds or fruits.
4. They will produce seeds and fruits that are genetically identical to the parent.

CBSE 2027 sample paper · 1 mark

The Vas deferens and the Oviduct are both targets for surgical contraception (Vasectomy and Tubectomy respectively). Analysing the process of reproduction, what common biological event is prevented by blocking both these structures?

1. The production of gametes (sperm and egg).
2. The implantation of the fertilized egg into the uterine wall.
3. The successful meeting and fusion of the male and the female gametes.
4. The release of hormones - testosterone and estrogen.

CBSE 2027 sample paper · 1 mark

The male gamete of an apple plant has seventeen chromosomes. What is the number of chromosomes in the female gamete and in the cells of the adult plant respectively?

1. 17,17
2. 17,34
3. 34,34
4. 34,51

CBSE 2027 sample paper · 2 marks

What changes are observed in the uterus subsequent to implantation of the young embryo in a human female?

CBSE 2026 board paper · 1 mark

Identify the type of reproduction described below : [Sequence, left to right joined by arrows: a single irregular-shaped (amoeba-like) cell with one nucleus; the nucleus elongates; the nucleus divides into two and the cell elongates; the cytoplasm constricts in the middle between the two nuclei; the cell separates into two daughter cells, each with one nucleus (arrows lead to the two separate daughter cells).]

1. Budding
2. Fragmentation
3. Spore Formation
4. Binary Fission

CBSE 2026 board paper · 1 mark

Yeast multiplies by which of the following methods ?

1. Fragmentation
2. Binary Fission
3. Multiple Fission
4. Budding

CBSE 2026 board paper · 1 mark

Which of the following statements correctly identify the advantages of vegetative propagation ? (i) Plants can bear flowers and fruits earlier than those produced by seeds. (ii) The new plants develop as an outgrowth on the parent plant and can be removed easily. (iii) Plants that have lost the capacity to produce seeds can be propagated. (iv) All plants produced are genetically similar to parent plant.

1. (i), (iii), (iv)
2. (ii), (iii), (iv)
3. (i), (ii), (iii)
4. (ii), (iv) only

CBSE 2026 board paper · 1 mark

Identify the correct statement for spirogyra, leishmania and hydra :

1. they reproduce sexually.
2. they are unicellular.
3. they are multicellular.
4. they reproduce asexually.