ANSWER: (i) Seed propagation is not commonly used in bananas because most edible varieties are seedless and sterile, making their seeds either absent or non-viable. Hence, they cannot be grown in large numbers through seeds, so farmers use vegetative propagation. (ii) In this method, new banana planRead more
ANSWER:
(i) Seed propagation is not commonly used in bananas because most edible varieties are seedless and sterile, making their seeds either absent or non-viable. Hence, they cannot be grown in large numbers through seeds, so farmers use vegetative propagation.
(ii) In this method, new banana plants are produced from suckers or rhizomes that grow near the base of the parent plant. When these suckers are separated and planted in soil, they develop into fully grown banana plants. This method is quick and reliable for large-scale production.
(iii) Advantage: Vegetative propagation ensures that all new plants are genetically identical, showing the same desired qualities.
Disadvantage: However, the lack of variation makes them prone to diseases.
(iv) If a parent plant suffers from a disease, the same disease easily spreads to its offspring because they are clones.
Vegetative Propagation in Potato, Ginger, and Onion (i) Potato, ginger, and onion reproduce by vegetative propagation, a type of asexual reproduction where new plants arise from roots, stems, or leaves. For example, potato tubers with buds grow into new plants. (ii) Advantages: (i) It is a quick metRead more
Vegetative Propagation in Potato, Ginger, and Onion
(i) Potato, ginger, and onion reproduce by vegetative propagation, a type of asexual reproduction where new plants arise from roots, stems, or leaves. For example, potato tubers with buds grow into new plants.
(ii) Advantages: (i) It is a quick method, producing many plants in less time. (ii) It ensures genetic uniformity, preserving desirable traits.
Disadvantages: (i) It produces no variations, limiting adaptability. (ii) If the parent is diseased, offspring also inherit it.
(iii) Since only one parent is involved and there is no fusion of gametes, the offspring are genetically identical to the parent, hence show very little variation.
ANSWER: [C] Explanation: Saliva contains the enzyme salivary amylase (ptyalin), which helps in the breakdown of starch into simple sugars (maltose). If saliva secretion is reduced, this conversion is affected. Proteins are digested in the stomach by pepsin, fats are broken down in the small intestinRead more
ANSWER: [C]
Explanation: Saliva contains the enzyme salivary amylase (ptyalin), which helps in the breakdown of starch into simple sugars (maltose). If saliva secretion is reduced, this conversion is affected. Proteins are digested in the stomach by pepsin, fats are broken down in the small intestine by lipase, and sugars into alcohol occurs by fermentation in yeast, not in humans.
ANSWER: Secretion of less saliva in the mouth will mainly affect the conversion of starch into simple sugars. Saliva contains the enzyme salivary amylase (ptyalin), which breaks down starch into maltose and other simple sugars during chewing. If saliva production is reduced, this enzymatic action slRead more
ANSWER: Secretion of less saliva in the mouth will mainly affect the conversion of starch into simple sugars. Saliva contains the enzyme salivary amylase (ptyalin), which breaks down starch into maltose and other simple sugars during chewing. If saliva production is reduced, this enzymatic action slows down, leading to incomplete digestion of starch in the mouth. Proteins, fats, and sugars are digested in later parts of the alimentary canal, so their conversion is not significantly affected by saliva deficiency. Answer: (C).
ANSWER: [B] Explanation: The cerebellum is the part of the hindbrain that controls posture, balance, and coordination of voluntary movements like walking or picking objects. Reflex actions & impulse transmission → spinal cord and neurons. Blood pressure, breathing, heartbeat, swallowing → medullRead more
ANSWER: [B]
Explanation: The cerebellum is the part of the hindbrain that controls posture, balance, and coordination of voluntary movements like walking or picking objects.
Reflex actions & impulse transmission → spinal cord and neurons.
Banana plants are generally propagated through vegetative methods. (i) Why is seed propagation not used in bananas? (ii) Explain the process of vegetative propagation in banana. (iii) List one advantage and one disadvantage of this method. (iv) If a disease affects the parent banana plant, will it also spread to the offspring? Why?
ANSWER: (i) Seed propagation is not commonly used in bananas because most edible varieties are seedless and sterile, making their seeds either absent or non-viable. Hence, they cannot be grown in large numbers through seeds, so farmers use vegetative propagation. (ii) In this method, new banana planRead more
ANSWER:
(i) Seed propagation is not commonly used in bananas because most edible varieties are seedless and sterile, making their seeds either absent or non-viable. Hence, they cannot be grown in large numbers through seeds, so farmers use vegetative propagation.
(ii) In this method, new banana plants are produced from suckers or rhizomes that grow near the base of the parent plant. When these suckers are separated and planted in soil, they develop into fully grown banana plants. This method is quick and reliable for large-scale production.
(iii) Advantage: Vegetative propagation ensures that all new plants are genetically identical, showing the same desired qualities.
Disadvantage: However, the lack of variation makes them prone to diseases.
(iv) If a parent plant suffers from a disease, the same disease easily spreads to its offspring because they are clones.
See lessNeha observed that potato, ginger, and onion grow from their underground parts, even without seeds. (i) Which mode of reproduction is seen here? Explain with one example. (ii) State two advantages and two disadvantages of this mode of reproduction. (iii) Why do such offsprings show very little variation?
Vegetative Propagation in Potato, Ginger, and Onion (i) Potato, ginger, and onion reproduce by vegetative propagation, a type of asexual reproduction where new plants arise from roots, stems, or leaves. For example, potato tubers with buds grow into new plants. (ii) Advantages: (i) It is a quick metRead more
Vegetative Propagation in Potato, Ginger, and Onion
(i) Potato, ginger, and onion reproduce by vegetative propagation, a type of asexual reproduction where new plants arise from roots, stems, or leaves. For example, potato tubers with buds grow into new plants.
(ii) Advantages: (i) It is a quick method, producing many plants in less time. (ii) It ensures genetic uniformity, preserving desirable traits.
Disadvantages: (i) It produces no variations, limiting adaptability. (ii) If the parent is diseased, offspring also inherit it.
(iii) Since only one parent is involved and there is no fusion of gametes, the offspring are genetically identical to the parent, hence show very little variation.
See lessSecretion of less saliva in mouth will affect the conversion of:
ANSWER: [C] Explanation: Saliva contains the enzyme salivary amylase (ptyalin), which helps in the breakdown of starch into simple sugars (maltose). If saliva secretion is reduced, this conversion is affected. Proteins are digested in the stomach by pepsin, fats are broken down in the small intestinRead more
ANSWER: [C]
Explanation: Saliva contains the enzyme salivary amylase (ptyalin), which helps in the breakdown of starch into simple sugars (maltose). If saliva secretion is reduced, this conversion is affected. Proteins are digested in the stomach by pepsin, fats are broken down in the small intestine by lipase, and sugars into alcohol occurs by fermentation in yeast, not in humans.
See lessSecretion of less saliva in mouth will affect the conversion of:
ANSWER: Secretion of less saliva in the mouth will mainly affect the conversion of starch into simple sugars. Saliva contains the enzyme salivary amylase (ptyalin), which breaks down starch into maltose and other simple sugars during chewing. If saliva production is reduced, this enzymatic action slRead more
ANSWER: Secretion of less saliva in the mouth will mainly affect the conversion of starch into simple sugars. Saliva contains the enzyme salivary amylase (ptyalin), which breaks down starch into maltose and other simple sugars during chewing. If saliva production is reduced, this enzymatic action slows down, leading to incomplete digestion of starch in the mouth. Proteins, fats, and sugars are digested in later parts of the alimentary canal, so their conversion is not significantly affected by saliva deficiency. Answer: (C).
See lessSelect the group in which all functions are controlled by the cerebellum: (A) reflex action, transmission of impulses, maintaining blood pressure (B) maintaining posture, balancing the body, coordinating voluntary movements (C) beating of heart, breathing, swallowing (D) thinking, reasoning, memorial storage
ANSWER: [B] Explanation: The cerebellum is the part of the hindbrain that controls posture, balance, and coordination of voluntary movements like walking or picking objects. Reflex actions & impulse transmission → spinal cord and neurons. Blood pressure, breathing, heartbeat, swallowing → medullRead more
ANSWER: [B]
Explanation: The cerebellum is the part of the hindbrain that controls posture, balance, and coordination of voluntary movements like walking or picking objects.
Thus, only posture, balance, and coordination are controlled by the cerebellum.
See less