GENERAL SCIENCE :BIOLOGY
Part Number ———1
1. Photo-oxidation is—
A. photorespiration
B. photolysis
C. light and oxygen induced breakdown
D. All of the above
Answer: Option D
Explanation : Photo-oxidation involves all of the above process. Photo-oxidation is a chain process incorporating a large number of chemical reactions which are subsequent to the outcome of the primary event—absorption of a photon, which induces breakdown to free-radical products.
2. Pollination is best defined as—
A. transfer of pollen from anther to stigma
B. germination of pollen grains
C. growth of pollen tube in ovule
D. visiting flowers by insects
Answer: Option A
Explanation :Pollination can be best defined as the transfer of pollen from the male anther of a flower to the female stigma to produce new offspring.
3. Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to—
A. angiosperms
B. gymnosperms
C. monocotyledons
D. dicotyledons
Answer: Option B
Explanation :Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to gymnosperms, a taxonomic class that includes plants whose seeds are not enclosed in an ovule.
4. Ozone hole refers to—
A. hole in ozone layer
B. decrease in the ozone layer in troposphere
C. decrease in thickness of ozone layer in stratosphere
D. increase in the thickness of ozone layer in troposphere
Answer: Option C
Explanation :The term ‘ozone hole’ refers to the depletion of the protective ozone layer in the upper atmosphere (stratosphere) over Earth’s polar regions. Stratospheric ozone is constantly produced by the action of the sun’s ultraviolet radiation on oxygen molecules (known as photochemical reactions).
5. Ordinary table salt is sodium chloride. What is baking soda?
A. Potassium chloride
B. Potassium carbonate
C. Potassium hydroxide
D. Sodium bicarbonate
Answer: Option D
Explanation :Sodium bicarbonate (IUPAC name: sodium hydrogencarbonate), commonly known as baking soda or bicarbonate of soda, is a chemical compound with the formula NaHCO3.
6. Plants absorb dissolved nitrates from soil and convert them into
A. free nitrogen
B. urea
C. ammonia
D. proteins
Answer: Option A
Explanation :The plant cells absorb nitrates from the soil and convert them into ammonia which ultimately reduced to ammonium ions (NH4+). These ammonium ions are then combined with organic compounds to form amino acids such as glutamine i.e., free nitrogen. This process of conversion is known as nitrogen fixation.
7. Plants synthesis protein from
A. starch
B. sugar
C. amino acids
D. fatty acids
Answer: Option C
Explanation :We know that, proteins are polymers of amino acids. So, plants are also used to synthesise protein from amino acids. Hence, plants synthesis protein from amino acids in the presence of ATP by specific synthetases.
8. Most fish do not sink in water because of the presence of:
I. swim bladder
II. air bladder
III. air sacs
IV. air in spongy bones
A. I and II are correct
B. II and III are correct
C. III and IV are correct
D. I, II, III and IV are correct
Answer: Option A
Explanation :Fishes have a swim bladder or air bladder which helps them to remain buoyant without sinking in water. They are present in the body cavity.
9. Photosynthesis generally takes place in which parts of the plant?
A. Leaf and other chloroplast bearing parts
B. steam and leaf
C. Roots and chloroplast bearing parts
D. Bark and leaf
Answer: Option A
Explanation :In plants, the process of photosynthesis takes place in the mesophyll of the leaves, inside the chloroplasts. Chloroplasts contain disc-shaped structures called thylakoids, which contain the pigment chlorophyll.
10. Movement of cell against concentration gradient is called
A. osmosis
B. active transport
C. diffusion
D. passive transport
Answer: Option B
Explanation :Active transport, this is the only transport method that can move species against their concentration gradient (from low to high concentration). Facilitated diffusion only moves species down their concentration gradient from high to low concentration.
11. Most highly intelligent mammals are
A. whales
B. dolphins
C. elephants
D. kangaroos
Answer: Option B
Explanation :Dolphins demonstrate the ability to do all of these things and most scientists agree that dolphins are very intelligent. They are notoriously talented mimics and quick learners; they demonstrate self-awareness, problem-solving, and empathy, innovation, teaching skills, grief, joy and playfulness.
12. Plant development is influenced by
A. quality of light only
B. quality and quantity of light
C. quality and duration of light
D. quality, quantity and duration of light
Answer: Option D
Explanation :Plant development is influenced by quality, quantity and duration of light. Plants cannot get too much light, but they can get too much of the heat energy that comes with the light.
- Prokaryotic cells lack
A. nucleolus
B. nuclear membrane
C. membrane bound by organelles
D. All of these
Answer: Option D
Explanation :Prokaryotic cells lack nucleolus, nuclear membrane and membrane bound by organelles.
14. Photosynthesis takes place faster in
A. yellow light
B. white light
C. red light
D. darkness
Answer: Option B
Explanation :As far as the rate of photosynthesis is concerned, it is fastest in white light making the rate of photosynthesis maximum. After white, we have violet light where photosynthesis occur to a higher extent as it has the shortest wavelength hence has the max energy.so the order is-white>violet>blue
15. Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by
A. Robert Hooke
B. Robert Brown
C. Rudolf Virchow
D. Theodore Schwann
Answer: Option B
Explanation :Nucleus, the genetic material containing rounded body in each cell, was first discovered in 1831 by Robert Brown.
16. Process of cell division can take place by
A. heterosis
B. fusion
C. mitosis
D. None of these
Answer: Option C
Explanation :Mitosis is a process of nuclear division in eukaryotic cells that occurs when a parent cell divides to produce two identical daughter cells. During cell division, mitosis refers specifically to the separation of the duplicated genetic material carried in the nucleus.
17. Plants receive their nutrients mainly from——––
A. chlorophyll
B. atmosphere
C. light
D. soil
Answer: Option D
Explanation :Plants receive their nutrients mainly from Soil Because Soil contains all Minerals, Water, Humus and some useful Microbes which are responsible for the proper Growth of the Plants.
18. Plants absorb most part of water needed by them through their
A. embryonic zone
B. growing point
C. root hairs
D. zone of elongation
Answer: Option C
Explanation :Root hair cells are specialized epidermal cells that greatly increase the surface area of roots. The function of root hairs is to collect water and mineral nutrients present in the soil and take this solution up through the roots to the rest of the plant.
19. One of the following is not a function of bones.
A. Place for muscle attachment
B. Protection of vital organs
C. Secretion of hormones for calcium regulation in blood and bones
D. Production of blood corpuscles
Answer: Option C
Explanation :Secretion of hormones for calcium regulation in blood and bones is not a function of a bone.
20. Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with—–
A. all gymnosperms, except conifers
B. only angiosperms
C. only conifers
D. angiosperms and all gymnosperms except conifers
Answer: Option C
Explanation :Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with only conifers.