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1 dioptre is the power of the lens whose focal length is 1 m.

Question:

Define 1 dioptre of power of a lens.

Answer:

1 dioptre is the power of the lens whose focal length is 1 m.

m = 3, u = –10 cm, v = ?From m = - (v/u)v = –(3)(–10) = 30 cm‍ So, the image is located 30 cm away behind the mirror.‍

Question:

A concave mirror produces a three times magnified (enlarged) real image of an object placed at 10 cm in front of it. Where is the image located?

Answer:

m = 3, u = –10 cm, v = ?

From m = - (v/u)

v = –(3)(–10) = 30 cm

‍

So, the image is located 30 cm away behind the mirror.

#A concave mirror produces a three times magnified (enlarged) real image...

the focal length of a convex mirror whose radius of curvature is 32cm is +16 cm.

Question:

Find the focal length of a convex mirror whose radius of curvature is 32cm.

Answer:

f = +16 cm.

#Find the focal length of a convex mirror whose radius of curvature is 32cm.

Concave mirror can give an erect and enlarged image of an object.

Question:

Name a mirror that can give an erect and enlarged image of an object.

Answer:

Concave mirror.

#Name a mirror that can give an erect and enlarged image of an object.

During dihybrid cross by Mendel, it was observed that when two pairs of traits were considered; each trait expressed independently of the ot

Question:

How do Mendel’s experiments show that traits are inherited independently?

Answer:

During dihybrid cross by Mendel, it was observed that when two pairs of traits were considered; each trait expressed independently of the other. Thus, Mendel was able to propose the Law of Independent Assortment which says about the independent inheritance of traits.

#How do Mendel’s experiments show that traits are inherited independently?

Mendel selected true breeding tall (TT) and dwarf (tt) pea plants. When a tall pea plant is crossed with a short (dwarf) pea plant.

Question:

How do Mendel’s experiments show that traits may be dominant or recessive?

Answer:

Mendel selected true breeding tall (TT) and dwarf (tt) pea plants. When a tall pea plant is crossed with a short (dwarf) pea plant, all the F1 hybrids are tall. (i.e., in this case, the gene causing tallness is dominant while the gene causing dwarfism is recessive.).The trait expressing itself in the hybrid is the dominant one. Mendel’s first law of inheritance states that when a pair of contrasting factors is brought in a hybrid, one factor inhibits the appearance of the other. The one which inhibits is the dominant one and which is inhibited is recessive.

#How do Mendel’s experiments show that traits may be dominant or recessive?

Variation promotes the survival of species in the following ways:Variation improves the survival rate of species as it helps the individual

Question:

How does the creation of variations in a species promote survival?

Answer:

Variation promotes the survival of species in the following ways:

Variation improves the survival rate of species as it helps the individual organisms adapt based on altering environmental conditions.

Variants formed due to environmental concerns form the basis for evolution.

#How does the creation of variations in a species promote survival?

In the given question we will see that trait B will be seen earlier. This happens because, in the case of an asexually reproducing populatio

Question:

If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?

Answer:

In the given question we will see that trait B will be seen earlier. This happens because, in the case of an asexually reproducing population, the organisms will be the exact copy of their parents. Now if there is a mutation just in the case of trait A as we see, it will take time to appear in the population. Trait B being the majority will appear first.

#If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population #which trait is likely to have arisen earlier?

The testes are the male reproductive organs that are located outside the abdominal cavity within a pouch called scrotum.

Question:

What are the functions performed by the testis in human beings?

Answer:

The testes are the male reproductive organs that are located outside the abdominal cavity within a pouch called scrotum.

Functions of testes :

Produce sperms

Produce a hormone called testosterone, which brings about secondary sexual characteristics in boys.

#What are the functions performed by the testis in human beings?

Advantages of sexual reproduction :In sexual reproduction, more variations are produced. Thus, it ensures the survival of species in a popul

Question:

What are the advantages of sexual reproduction over asexual reproduction?

Answer:

Advantages of sexual reproduction :

In sexual reproduction, more variations are produced. Thus, it ensures the survival of species in a population.

The newly formed individual has the characteristics of both parents. Variations are more viable in the sexual mode than in the asexual one. This is because, in asexual reproduction, DNA has to function inside the inherited cellular apparatus.

#What are the advantages of sexual reproduction over asexual reproduction?

The anther contains (d) pollen grains.

Question:

The anther contains :

(a) sepals (b) ovules

(c) pistil (d) pollen grains

Answer:

(d) pollen grains

#The anther contains :#(a) sepals (b) ovules #(c) pistil (d) pollen grains

Asexual reproduction takes place through budding in (b) Yeast.

Question:

Asexual reproduction takes place through budding in :

(a) Amoeba (b) Yeast

(c) Plasmodium (d) Leishmania

Answer:

(b) Yeast

#Asexual reproduction takes place through budding in :#(a) Amoeba (b) Yeast #(c) Plasmodium (d) Leishmania

Sensory nerves receive information. Actions in animals are controlled by the nerves...

Question:

Compare and contrast the neural and hormone mechanisms of action for control and co-ordination in animals.

Answer:

Sensory nerves receive information. Actions in animals are controlled by the nerves of the nervous system. It is regulated by all the hormones on the blood sugar level, metabolism, growth and development. Therefore, control and co-ordination in human beings are done by the nervous system and the hormonal system together.

#Compare and contrast the neural and hormone mechanisms of action for control and co-ordination in animals.

The table below states how involuntary actions and reflex actions different from each other...

Question:

How are involuntary actions and reflex actions different from each other?

Answer...

#How are involuntary actions and reflex actions different from each other?

Every environmental change has an effect on the response of the organism...

Question:

What is the need for a system of control and co-ordination in an organism?

Answer:

Every environmental change has an effect on the response of the organism. Like we talk slowly in an office, do not talk loudly. Our activities are done in such a way that the work gets completed. There should not be any interference in it. Control and co-ordination mechanism is absolutely needed in working according to the environment and occasion, due to which the person remains controlled and related.

#What is the need for a system of control and co-ordination in an organism?

Some chemical substances are secreted by the cells in plants...

Question:

How does chemical co-ordination take place in plants?

Answer:

Some chemical substances are secreted by the cells in plants. They are called plant hormones. Plant hormones co-ordinate with the growth and development of plants. These plant hormones work by being secreted somewhere away from the site of action and reaching that place by diffusion.

#How does chemical co-ordination take place in plants?

The brain is responsible for...

Question:

The brain is responsible for :

(a) Thinking.

(b) Regulating the heartbeat.

(c) Balancing the body.

(d) All of the above

Answer:

(b) Regulating the heartbeat

#The brain is responsible for : (a) Thinking. (b) Regulating the heartbeat. (c) Balancing the body. (d) All of the above.

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