IBPS PO General Awareness: Biology questions with solutions

Q1. Pine, fir, spruce, cedar, larch, and cypress are famous timber-yielding plants, several of which also occur widely in the hilly regions of India. All these belong to

1. angiosperms
2. gymnosperms
3. monocotyledons
4. dicotyledons

Answer: gymnosperms

Pine, fir, spruce, cedar, larch, and cypress are conifers. Conifers are gymnosperms, which are seed-producing plants with naked seeds and no true flowers or fruits.

Q2. Pollination is best defined as

1. transfer of pollen from anther to stigma
2. germination of pollen grains
3. growth of pollen tube in ovule
4. visiting flowers by insects

Answer: transfer of pollen from anther to stigma

Pollination is the transfer of pollen grains from the anther to the stigma of a flower. It is different from fertilization, pollen germination, or insect visitation.

Q3. Plants receive their nutrients mainly from

1. chlorophyll
2. atmosphere
3. light
4. soil

Answer: soil

Plants absorb water and mineral nutrients mainly from the soil through their roots. Chlorophyll, atmosphere, and light are important for photosynthesis, but not the main source of nutrients.

Q4. Which of the following nutrient deficiency shows retarded or stunted growth and yellowing of leaves?

1. Magnesium
2. Nitrogen
3. Iron
4. Calcium

Answer: Nitrogen

Nitrogen deficiency in plants typically causes stunted growth and yellowing of leaves due to reduced chlorophyll formation. It is one of the most common nutrient deficiency symptoms.

Q5. Both statements (I) and (II) are reasons why jellyfish can survive better than other fishes in polluted water. Which of the following best explains this phenomenon?

1. Jellyfish have a higher metabolic rate
2. Jellyfish can photosynthesize
3. Jellyfish thrive in low-oxygen and high-pollution environments
4. Jellyfish are immune to all toxins

Answer: Jellyfish thrive in low-oxygen and high-pollution environments

Jellyfish are relatively tolerant of low-oxygen and polluted conditions, which helps them survive where many fish cannot. They do not photosynthesize or become completely immune to toxins.